论文检索

主页 | 软件工具 | 课题库 | 公众号
:



总访问量:1733812

总访客量:86888

关键词:
Organic Matter |
DOM |
POM |
Soil OM |
Sediment OM |
Organic Carbon |
Organic Nitrogen |
Biomarker |
Humic Substances |
Fulvic Substances |
Humins |
Biochar |
Black Carbon |
GDGT |
Lignin |
Free Radical |
...
最新文章  | 
昨日文章 | 
前日文章
期刊:
Agriculture, Ecosystems & Environment |
Agricultural Water Management |
Applied Geochemistry |
Applied Soil Ecology |
Aquatic Geochemistry |
Atmospheric Research |
Biogeochemistry |
Biogeosciences |
Biology and Fertility of Soils |
Bioresource Technology |
CATENA |
Chemical Engineering Journal |
Chemical Geology |
Chemosphere |
CLEAN - Soil, Air, Water |
Colloids and Surfaces A: Physicochemical and Engineering Aspects |
Deep Sea Research Part II: Topical Studies in Oceanography |
Earth-Science Reviews |
Ecological Engineering |
Ecology Letters |
Ecology |
Ecotoxicology and Environmental Safety |
Environment International |
Environmental Earth Sciences |
Environmental Geochemistry and Health |
Environmental Monitoring and Assessment |
Environmental Pollution |
Environmental Research |
Environmental Science & Technology |
Environmental Science and Pollution Research |
Environmental Science: Processes Impacts |
Environmental Science: Water Research & Technology |
Environmental Toxicology and Chemistry |
Estuarine, Coastal and Shelf Science |
European Journal of Soil Science |
Forest Ecology and Management |
Geochimica et Cosmochimica Acta |
Geoderma |
Geophysical Research Letters |
Global Change Biology |
Global Biogeochemical Cycles |
Groundwater |
Harmful Algae |
International Journal of Coal Geology |
Journal of Environmental Chemical Engineering |
Journal of Environmental Management |
Journal of Environmental Sciences |
Journal of Geophysical Research: Biogeosciences |
Journal of Geophysical Research: Oceans |
Journal of Hazardous Materials |
Journal of Membrane Science |
Journal of Soils and Sediments |
Land Degradation & Development |
Limnology and Oceanography |
Marine Chemistry |
Marine Pollution Bulletin |
Nature Communications |
Nature Geoscience |
Ocean Science Journal |
Oikos |
Organic Geochemistry |
Palaeogeography, Palaeoclimatology, Palaeoecology |
Plant and Soil |
Progress in Oceanography |
Quaternary International |
Science of The Total Environment |
Sedimentary Geology |
Separation and Purification Technology |
Soil and Tillage Research |
Soil Biology and Biochemistry |
Waste Management |
Water Research |
Water, Air, & Soil Pollution |
Wetlands |
...

所有论文

1. 题目: Effects of dissolved organic matter on distribution characteristics of heavy metals and their interactions with microorganisms in soil under long-term exogenous effects
文章编号: N24071521
期刊: Science of the Total Environment
作者: Han Zhang, Wenjie Liu, Ying Xiong, Guowen Li, Jianglong Cui, Chen Zhao, Lieyu Zhang
更新时间: 2024-07-15
摘要: Long-term waste accumulation (LTWA) in soil not only alters its physical and chemical properties but also affects heavy metals and microorganisms in polluted soil through the dissolved organic matter (DOM) it produces. However, research on the impact of DOM from LTWA on heavy metals and microorganisms in polluted soil is limited, which has resulted in an incomplete understanding of the mechanisms involved in LTWA soils remediation. This study focuses on the DOM generated by waste accumulation and analyses the physicochemical properties, microbial community structure, and vertical distribution of heavy metals in four types of LTWA soils at different depths (0–100 cm). A causal analysis is conducted using structural equation modelling. The results indicate that due to the retention effect of the soil and microorganisms, heavy metal pollution is concentrated on the soil surface layer (>30 cm). With increasing depth, there is a decrease in heavy metal concentration and an increase in microbial diversity and abundance. DOM plays a significant role in regulating the concentration of soil heavy metals and the diversity and abundance of microorganisms. The DOM from different soils gradually transforms into substances dominated by tyrosine, tryptophan, and fulvic acid, which sustain the normal life activities and gene expression of microorganisms. Bacteria such as , , , and , which are involved in energy transformation, along with genes such as water channel protein and , which enhance heavy metal metabolism, ensure that microbial communities can maintain basic life processes in polluted environments and gradually select for dominant species that are adapted to heavy metal pollution. These novel discoveries illuminate the potential for modulating the composition of DOM to amplify microbial activity, while concurrently offering insights into the migration patterns of various long-term exogenous pollutants. This foundational knowledge provides a foundation for the development of efficacious remediation strategies.

2. 题目: Beyond land use: Understanding variations in topsoil bulk versus recalcitrant organic matter
文章编号: N24071520
期刊: Catena
作者: Gergely Jakab, Ákos Bede-Fazekas, Viktória Vona, Balázs Madarász, Máté Karlik, Dóra Zacháry, Tibor Filep, Zoltán Dévény, Csaba Centeri, Malihe Masoudi, András Bidló, Thulfiqar Al-Graiti, Gábor Szatmári, Anna Vancsik, Csilla Király, Gabriella Darabos, Zsuzsanna Angyal, Zoltán Szalai
更新时间: 2024-07-15
摘要: Soil organic matter (SOM) concentration and composition are essential properties that affect most functions and ecosystem services. The relationship between soil and environmental covariates regarding SOM concentration and composition in various pools is not completely understood. This study aimed to identify the most influential drivers of SOM stabilization, focusing on arable lands in Hungary. Hungary is an ideal area for investigating SOM variability because it is at the meeting point of the three main climate effects that trigger a wide range of soil, land use, and topographical conditions. Overall, 87 soil samples were taken from the topsoil (2–20 cm) and fractionated (<20 µm) to separate the mineral phase-associated organic carbon (MAOC) and bulk pools. MAOC concentration varied on a wide range (0.5–14.1 %) and was the function of bulk SOM aromaticity and slope steepness, rather than land use, climatic conditions, or soil properties, indicating that MAOC is also affected by decomposition if the bulk OM is less available for the microbiome. Land use, especially in forest topsoils, reflects the elemental composition of the OM, focusing on the variations of residue composition. In contrast, aromaticity is rather related to soil and climate properties, suggesting increased relevance of transformation processes. As a consequence, SOM composition varies on a wide range in the topsoil, however, the lack of a definite trend at the county level suggests the complexity of the system and highlights the role of local circumstances.

3. 题目: Efficient removal of cadmium and lead in water by using nano-manganese oxide-loaded hydrochloric acid pretreated biochar
文章编号: N24071519
期刊: Journal of Environmental Chemical Engineering
作者: Zhen Zhou, Li Huang, Huicheng Wang, Yulu Chen
更新时间: 2024-07-15
摘要: Cadmium (Cd) and lead (Pb) contaminated water pose a serious threat to the safety of aquatic organisms and human food, which is a hot topic in the world. To improve the removal efficiency of straw biochar (BC) on Cd and Pb pollution water, the modified biochar (BCHMn) was manufactured by loading nano-manganese oxide (nano-MnO) on hydrochloric acid pretreated BC. The adsorptive properties of Cd and Pb for BCHMn were examined by isothermal, kinetic adsorption models, and cycle tests. The results indicated that the adsorption of Cd and Pb by BCHMn is suitable for Langmuir, Sips, Avrami, and pseudo-second-order kinetic model, suggesting monolayer and heterogeneous chemical adsorption. The maximum theoretical adsorptive amount of Cd and Pb on BCHMn are 108.21 mg/g and 312.16 mg/g, respectively. The adsorption mechanism of BCHMn is primarily mineral precipitation, π electron interaction, and ion exchange. Moreover, BCHMn contained the special birnessite (δ-MnO) structures and MnO, which can form stable complexes with Cd/Pb (such as Mn-O-Cd/Pb and Mn-R-O-Cd/Pb). These results indicate that BCHMn can efficiently remove Cd and Pb from water, and provide a reference for the comprehensive utilization of straw waste and water pollution control.

4. 题目: Iron mineral type controls organic matter stability and priming in paddy soil under anaerobic conditions
文章编号: N24071518
期刊: Soil Biology and Biochemistry
作者: Shuang Wang, Wei Gao, Zhi Ma, Zhenke Zhu, Yu Luo, Liang Wei, Hongzhao Yuan, Song Chen, Chaoyun Ying, Kyle Mason-Jones, Yakov Kuzyakov, Tida Ge
更新时间: 2024-07-15
摘要: Associations of iron (hydr)oxides (FeOx) with organic carbon are vital in regulating the stability of soil organic carbon (SOC). Like SOC, FeOx is chemically dynamic in soils, particularly under anaerobic conditions. However, previous research has not clarified how the stability of FeOx (goethite versus ferrihydrite) and the formation pathway of FeOx-OC associations (adsorption versus coprecipitation) affect the stability of FeOx-bound OC and, subsequently, the priming effect (PE) under anaerobic conditions. With an aim to bridge this gap, we incubated paddy soils for 80 d under anaerobic conditions after adding free C-glucose, ferrihydrite- or goethite-bound C-glucose formed by either adsorption or coprecipitation. Compared with the free glucose addition, the FeOx-bound glucose addition increased CO production by 8%–21% but reduced C–CH production by 7%–10%. Ferrihydrite-bound glucose was mineralised more than goethite-bound glucose; this is consistent with its lower crystallinity facilitating reduction and, thus, higher OC bioavailability. Glucose induced a negative priming effect (PE) for CO but a positive PE for CH, whereas FeOx-bound glucose showed the opposite trend. This may be because FeOx-bound glucose provides an energy source and electron acceptor for Fe-reducing bacteria; this promotes the dissimilating reduction of iron and combines with an aggravated microbial P limitation resulting from the FeOx input. The crystallinity of FeOx affected the amount of primed CH rather than its formation pathway. In conclusion, the crystallinity of FeOx controls the stability of FeOx-OC associations and the PE of SOC decomposition under anaerobic conditions.

5. 题目: Changes in aggregate-associated carbon pools and chemical composition of topsoil organic matter following crop residue amendment in forms of straw, manure and biochar in a paddy soil
文章编号: N24071517
期刊: Geoderma
作者: Shuotong Chen, Xin Xia, Yuanjun Ding, Xiao Feng, Qingmei Lin, Tianyi Li, Rongjun Bian, Lianqing Li, Kun Cheng, Jufeng Zheng, Xuhui Zhang, Shaopan Xia, Yan Wang, Xiaoyu Liu, Genxing Pan
更新时间: 2024-07-15
摘要: In agricultural ecosystems, incorporation of crop residues has been practiced as a recycling approach for sustaining soil organic matter (SOM) and soil fertility. However, how crop residue amendments in different forms (direct straw return, converted as manure and pyrolyzed as biochar) affect soil organic carbon (SOC) pools and SOM composition is not well known. In this study, a short-term (2015–2019) field experiment in paddy soil was conducted with a one-time maize residue amendment, consistently in a single doses of 10 Mg ha organic carbon (OC) equivalent, in three forms: air-dried straw (CS), cattle manure (CM) and biochar (CB). No residue amendment (CK) was used as control. Topsoil organic matter changes were analysed using C isotopic tracing, biomarker analysis, and solid-state C nuclear magnetic resonance spectroscopy in combination with soil aggregate density/size fractionation. After four cropping cycles following amendment, SOC content was unchanged under CS and CM but increased by 24% under CB; However, the OC pool ratio of particulate organic matter (POM) to mineral-associated organic matter (MAOM) significantly increased under all amendments compared to CK. The δC values indicated that maize-derived OC was preserved the most in the POM within the macroaggregates, particularly under CB. Regarding the molecular composition, all residue amendments increased the abundance ratio of plant- to microbe-derived lipids. Plant-derived lipids were primarily concentrated in macroaggregates, whereas microbial lipids were more prevalent in the silt–clay fractions. Lignin phenols were significantly enriched only in microaggregates under CS relative to CK. Overall, SOM changes in the paddy topsoil following crop residue amendment in different forms were depicted by OC pool redistribution and molecular composition alteration. The study highlighted that biochar amendment, instead of straw or manure, greatly enhanced SOC accumulation by promoting macro-aggregation, which in turn preserved plant-derived carbon through the direct input of the persistent char in a rice paddy.

6. 题目: Microbial metabolic traits drive the differential contribution of microbial necromass to soil organic carbon between the rhizosphere of absorptive roots and transport roots
文章编号: N24071516
期刊: Soil Biology and Biochemistry
作者: Qitong Wang, Jipeng Wang, Ziliang Zhang, Min Li, Dungang Wang, Peipei Zhang, Na Li, Huajun Yin
更新时间: 2024-07-15
摘要: The rhizosphere is a typical soil microbial hotspot, however, not a homogeneous entity. Due to root functional differentiation, different root functional modules (i.e., absorptive roots and transport roots) can play distinct roles in microbial necromass formation and subsequent soil organic carbon (SOC) sequestration by influencing microbial metabolic activity in the surrounding soil. Yet, how microbial metabolic traits mediated by different root functional modules regulate the accumulation of microbial necromass C (MNC) in the rhizosphere remains poorly understood. Herein, we quantified and compared the differences in the contribution of MNC to SOC between the rhizosphere of two root functional modules, and explored the role of microbial metabolic traits in influencing the contribution of MNC to rhizosphere SOC in different root functional modules in two spruce ( Mast.) plantations. Our findings revealed that absorptive roots exhibited a significantly higher contribution of MNC to SOC (32.9–37.5%) compared to transport roots (27.7–30.5%) in the rhizosphere. This suggests that absorptive roots possess a greater ability to promote MNC accumulation in the rhizosphere than transport roots. This observation was mainly attributed to the difference in the trade-offs between microbial growth and investment traits between the two root functional modules. Specifically, the rhizosphere of absorptive roots had greater microbial C use efficiency (CUE), faster growth and turnover rates, lower respiratory quotients and biomass-specific enzyme activity than did those of transport roots, suggesting that absorptive roots support greater microbial growth yields and subsequently greater necromass production. Collectively, our findings demonstrate that the contribution of MNC to SOC in the rhizosphere largely depends on the trade-offs of microbial metabolic traits mediated by root functional differentiation. Our study also provides novel and direct empirical evidence supporting the need to integrate function-based fine root classifications with the different contributions of MNC to SOC sequestration in the rhizosphere into land surface models of C cycling.

7. 题目: Synergistic enhancement of cadmium immobilization and soil fertility through biochar and artificial humic acid-assisted microbial-induced calcium carbonate precipitation
文章编号: N24071515
期刊: Journal of Hazardous Materials
作者: Yu Li, Meiling Zhang, Xiaobin Wang, Shuang Ai, Xianghui Meng, Zhuqing Liu, Fan Yang, Kui Cheng
更新时间: 2024-07-15
摘要: Microbially induced carbonate precipitation (MICP) is emerging as a favorable alternative to traditional soil remediation techniques for heavy metals, primarily due to its environmental friendliness. However, a significant challenge in using MICP for farmland is not only to immobilize heavy metals but also to concurrently enhance soil fertility. This study explores the innovative combination of artificial humic acid (A-HA), biochar (BC), and () to mitigate the bioavailability of cadmium (Cd) in contaminated agricultural soils through MICP. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses revealed that the integration of BC and A-HA significantly enhances Cd immobilization efficiency by co-precipitating with CaCO. Moreover, this treatment also improved soil fertility and ecological functions, as evidenced by increases in total nitrogen (TN, 9.0–78.2 %), alkaline hydrolysis nitrogen (AN, 259.7–635.5 %), soil organic matter (SOM, 18.1–27.9 %), total organic carbon (TOC, 43.8–48.8 %), dissolved organic carbon (DOC, 36.0–88.4 %) and available potassium (AK, 176.2–193.3 %). Additionally, the relative abundance of dominant phyla such as and significantly increased with the introduction of BC and A-HA in MICP. Consequently, the integration of BC and A-HA with MICP offers a promising solution for remediating Cd-contaminated agricultural soil and synergistically enhancing soil fertility.

8. 题目: Effect of field warming on soil microbial carbon use efficiency——A meta-analysis
文章编号: N24071514
期刊: Soil Biology and Biochemistry
作者: Qiufang Zhang, Jiguang Feng, Xiaojie Li, Yuehmin Chen, Joshua P Schimel, Biao Zhu
更新时间: 2024-07-15
摘要: Soil organic carbon storage in soil carbon models is highly sensitive to microbial carbon use efficiency (CUE); thus, to reliably predict C storage requires quantifying the response of CUE to warming. By conducting a meta-analysis of 87 observations from field warming experiments worldwide, we found that field warming has no significant effect on CUE, which remains constant at 0.35 ± 0.19 (mean ± SD) on average. The effect of field warming on CUE is independent of climate factors, incubation temperatures, ecosystem types, warming methods, or CUE measurement methods. The field warming effect on CUE was best explained by the response ratios of microbial biomass–specific growth and microbial biomass–specific respiration according to a multi-model selection, and there was a limited effect of warming on microbial biomass–specific growth and microbial biomass–specific respiration. Overall, the effect of field warming on CUE may be attributed to microbial acclimation. Similarly, insignificant effect of laboratory warming on CUE was observed. Our work highlights that current soil carbon models assuming that CUE decreases with warming may underestimate future soil carbon storage, and calls for more research to explore the regulatory role of microbial community attributes on CUE.

9. 题目: Mechanisms of conjugative transfer of antibiotic resistance genes induced by extracellular polymeric substances: Insights into molecular diversities and electron transfer properties
文章编号: N24071513
期刊: Journal of Hazardous Materials
作者: Qi Wang, Xiao Li, Keying Zhou, Yutong Li, Yanjie Wang, Guodong Zhang, He Guo, Jian Zhou, Tiecheng Wang
更新时间: 2024-07-15
摘要: Dissemination of antibiotic resistance genes (ARGs) has become a critical threat to public health. Activated sludge, rich in extracellular polymeric substances (EPS), is an important pool of ARGs. In this study, mechanisms of conjugation transfer of ARGs induced by EPS, including tightly bound EPS (TBEPS), soluble EPS (SEPS), and loosely bound EPS (LBEPS), were explored in terms of molecular diversities and electron transfer properties of EPS. Conjugation transfer frequency was increased by 9.98-folds (SEPS), 4.21-folds (LBEPS), and 15.75-folds (TBEPS) versus the control, respectively. Conjugation-related core genes involving SOS responses (9 genes), membrane permeability (18 genes), intercellular contact (17 genes), and energy metabolism pathways (13 genes) were all upregulated, especially in the presence of TBEPS. Carbohydrates and aliphatic substances in SEPS and LBEPS were contributors to ARG transfer, via influencing reactive oxygen species (ROS) formation (SEPS) and ROS and adenosine triphosphate (ATP) production (LBEPS). TBEPS had the highest redox potential and greatest lability and facilitated electron transfer and alternated respiration between cells, thus promoting ARG transfer by producing ATP. Generally, the chemical molecular characteristics and redox properties of EPS facilitated ARG transfer mainly by influencing lipid peroxidation and ATP, respectively.

10. 题目: Ultrasmall copper-metal organic framework (Cu-MOF) quantum dots decorated on waste derived biochar for enhanced removal of emerging contaminants: Synergistic effect and mechanistic insight
文章编号: N24071512
期刊: Journal of Environmental Management
作者: Saptarshi Roy, Soumya Ranjan Mishra, Md. Ahmaruzzaman
更新时间: 2024-07-15
摘要: This study proposes a novel one-pot hydrothermal impregnation strategy for surface decoration of waste derived biochar with zero‒dimensional Cu‒MOF Quantum dots (PBC‒HK), with an average particle size of 5.67 nm, for synergistic removal of an emerging sulfur containing drug pantoprazole (PTZ) and Basic Blue 26 (VB) dye within 80 min and 50 min of visible-light exposure, respectively. The designed Integrated Photocatalytic Adsorbent (IPA) presented an enhanced PTZ removal efficiency of 95.23% with a catalyst loading of 0.24 g/L and initial PTZ conc. 30 mg/L at pH 7, within 80 min via synergistic adsorption and photodegradation under visible-light exposure. While, on the other hand, 96.31% VB removal efficiency was obtained in 50 min with a catalyst dosage of 0.20 g/L, initial VB conc. 60 mg/L at pH 7 under similar irradiation conditions. An in-depth analysis of the synergistic adsorption and photocatalysis mechanism resulting in the shortened time for the removal of contaminants in the synergistic integrated model has been performed by outlining the various advantageous attributes of this strategy. The first-order degradation rate constant for PTZ was found to be 0.04846 min and 0.04370 min for PTZ and VB, respectively. Adsorption of contaminant molecules on the biochar (PS‒BC) surface can facilitate photodegradation by accelerating the kinetics, and photodegradation promotes regeneration of adsorption sites, contributing to an overall reduction in operation time for removal of contaminants. Besides enhancing the adsorption of targeted pollutants, the carbon matrix of IPAs serves as a surface for adsorption of intermediates of degradation, thereby minimizing the risk of secondary pollution. The photogenerated holes present in the VB is responsible for the generation of •OH radicals. While, the photogenerated electrons present in the CB are captured by Cu of the MOF metal center, reducing it to Cu, which is subsequently oxidized to produce additional •OH species in the aqueous medium. This process leads to effective charge separation of the photogenerated charge carriers and minimizes the probability of charge recombination as evident from photoluminescence (PL) analysis. Meanwhile, PL studies, EPR and radical trapping experiments indicate the predominant role of •OH radicals in the removal mechanism of PTZ and VB. The investigation of the degradation reaction intermediates was confirmed by HR‒LCMS, on the basis of which the plausible degradation pathway was elucidated in detail. Moreover, effects of pH, inorganic salts, other organic compounds and humic acid concentration have been investigated in detail. The environmental impact of the proposed method was comprehensively evaluated by ICP-OES analysis and TOC and COD removal studies. Furthermore, the economic feasibility and the cost-effectiveness of the catalyst was assessed to address the potential for large scale commercialization. Notably, this research not only demonstrates a rational design strategy for the utilization of solid waste into treasure via the fabrication of IPAs based on MOF Quantum dots (QDs) and waste-derived biochar, but also provides a practical solution for real wastewater treatment systems for broader industrial applications.

11. 题目: Conversion of pure Chinese fir plantation to multi-layered mixed plantation increases organic phosphorus accumulation and transformation within soil aggregates
文章编号: N24071511
期刊: Applied Soil Ecology
作者: Haimei Huang, Xueman Huang, Yi Wang, Jiajun Li, Mingzhu Xiang, Changhang Li, Shushou Liao, Yeming You
更新时间: 2024-07-15
摘要: Evaluation of the impacts of environmental factors and microbial communities on soil organic phosphorus (Po) availability is needed to clarify P cycling and regulate plantations productivity. However, the effects on Po accumulation and transformation of converting pure Chinese fir plantation to multi-layered mixed plantation and their regulatory mechanisms remain unclear. The aim of this study was to examine the impacts of the transformation of pure stand of Chinese fir (; PP) to mixed plantation with multiple tree species (, and ; MP) on Po accumulation and transformation within topsoil (0–10 cm) aggregates in subtropical China. Our results showed that the soil organic carbon (SOC), total nitrogen (TN), ammonium nitrogen (NH-N), and available phosphorus (AP), as well as the carbon‑nitrogen ratio of soil (C/N) and carbon‑phosphorus ratio of soil (C/P) were significantly higher ( < 0.05) of all aggregates in MP than those in PP. The quantities of soil microbial biomass C, N, P (MBC, MBN, and MBP) in all different aggregates were significantly greater ( < 0.05) in MP than in PP. The phospholipid fatty acid contents related to bacteria, fungi, arbuscular mycorrhizal fungi (AMF), and actinomycetes were significantly greater in all aggregate classes ( < 0.05) in MP relative to PP. The activities of all tested C, N, and P hydrolytic enzymes, as well as labile organic P, moderately labile organic P, moderately resistant organic P, and highly resistant organic P contents, were significantly higher of most aggregate size classes in MP. Finally, redundancy analysis (RDA) suggested that Po fractions were primarily affected by the NH-N, litterfall biomass (LF), carbon‑nitrogen ratio of litter (C/N), SOC and fine root biomass (FR). Our findings suggest that converting pure Chinese fir plantations into multi-layered mixed plantations may represent an effective management strategy for promoting organic P accumulation and transformation by regulating soil and microbial properties in degraded soils of Chinese fir plantations.

12. 题目: Sweet Secrets: Exploring Novel Glycans and Glycoconjugates in the Extracellular Polymeric Substances of “Candidatus Accumulibacter”
文章编号: N24071510
期刊: ACS ES&T Water
作者: Timothy Páez-Watson, Sergio Tomás-Martínez, Roeland de Wit, Sunanda Keisham, Hiroaki Tateno, Mark C M van Loosdrecht, Yuemei Lin
更新时间: 2024-07-15
摘要: Biological wastewater treatment relies on microorganisms that grow as flocs, biofilms, or granules for efficient separation of biomass from cleaned water. This biofilm structure emerges from the interactions between microbes that produce, and are embedded in, extracellular polymeric substances (EPS). The true composition and structure of the EPS responsible for dense biofilm formation are still obscure. We conducted a bottom-up approach utilizing advanced glycomic techniques to explore the glycan diversity in the EPS from a highly enriched “Candidatus Accumulibacter” granular sludge. Rare novel sugar monomers such as N-Acetylquinovosamine (QuiNAc) and 2-O-Methylrhamnose (2-OMe-Rha) were identified to be present in the EPS of both enrichments. Further, a high diversity in the glycoprotein structures of said EPS was identified by means of lectin based microarrays. We explored the genetic potential of “Ca. Accumulibacter” high quality metagenome assembled genomes (MAGs) to showcase the shortcoming of top-down bioinformatics based approaches at predicting EPS composition and structure, especially when dealing with glycans and glycoconjugates. This work suggests that more bottom-up research is necessary to understand the composition and complex structure of EPS in biofilms since genome based inference cannot directly predict glycan structures and glycoconjugate diversity.

13. 题目: Synergistic effect by Sorghum bicolor L., citric acid, biochar, and vermiwash amendment for the remediation of a mine-contaminated soil
文章编号: N24071509
期刊: Environmental Science and Pollution Research
作者: Hanan E Osman, Ruwaydah S Fadhlallah, Mohamed H E El-Morsy
更新时间: 2024-07-15
摘要:

Phytoremediation is an in situ remediation and eco-friendly technique employing accumulator plant species to remove trace elements (TEs) from contaminated sites. Moreover, it has been demonstrated that both natural and synthetic amendments can enhance trace elements (TEs) phytoremediation from polluted soils through bioenergy crops. This work assessed the synergistic impact of two tested biochar (BC) from data palm (B1) and Prosopis (B2) (1.5%/ kg), citric acid (CA, 1.5 mmol/kg) and vermiwash (VW, 20 ml/kg) to enhance the remediation of tested TEs (Mn, Zn, Cd, Pb, Ni, Cu, and Fe) from Mahad AD’Dahab mine-contaminated soil by sorghum (Sorghum bicolor L.). The BC and CA amendments alone and combined with VW significantly augmented the proliferation and survival of sorghum grown in mine-contaminated soil. Considering the individual and combined applications of VW and BC, the influence on plant growth followed this order: K < VW < B2 < B1 < B1 + VW < B2 + VW < CA < CA + VW. Applying tested BC/CA and VW significantly increased chlorophyll compared to unamended soil. The outcomes revealed a substantial elevation in TE absorption in both shoot and root (p ≤ 0.05) with all tested treatments compared to the untreated soil (K). The combined application of CA and VW resulted in the most significant TE uptake of TEs at both the root and the shoot. Furthermore, adding CA or VW as a foliar spray enhanced the bioaccumulation factor (BCF) and translocation factor (TF) of studied metals. The combined addition of CA and foliar spraying of VW was more effective than the sole addition of CA or VW. Such increase reached 20.0%, 15.6%, 19.4%, 14.3%, 14.0%, and 25.6% of TF, and 13.7%, 11.9%, 8.3%, 20.9%, 20.5%,18.7%, and 19.8% of BCE for Cd, Cu, Fe, Mn, Ni, Pb, and Zn, respectively. This study highlights the efficiency of combining CA/BC with VW as a more viable option for remediating mine-contaminated soil than individual amendments. However, future research should prioritize long-term field trials to assess the efficiency of using citric acid and vermiwash for restoring contaminated mining soils.

14. 题目: Characteristics of disinfection byproducts from dissolved organic matter during chlor(am)ination of source water in Tibetan Plateau, China
文章编号: N24071508
期刊: Science of the Total Environment
作者: Ruiqing Chen, Tianyu Chen, Yukun Zhou, Linfeng Li, Lingxiangyu Li, Nali Zhu, Zhigang Li, Yawei Wang, Guibing Jiang
更新时间: 2024-07-15
摘要: The Tibetan Plateau, a typical high-altitude area, is less affected by human activities such as industrial development, and the external pollution to water sources is extremely low. Then it is also an important source of water samples for exploring the molecular characteristics of precursors in the dissolved organic matter (DOM) of disinfection byproducts (DBPs) in drinking water. Research data on DBPs in drinking water on the Tibet Plateau remains insufficient, leading to uncertainty about DBP contamination in the area. This study explores the formation potential of 35 typical DBPs, including 6 trihalomethanes (THMs), 9 haloacetic acids (HAAs), 2 halogenated ketones (HKs), 9 nitrosamines (NAs), and 9 aromatic DBPs, during chlorination and chloramination of typical source water samples in the Tibet Plateau of China. Moreover, in order to further investigate the characteristics of the generation of DBPs, the molecular composition of DOM in the collected water samples was characterized by Fourier transform ion cyclotron resonance mass spectrometry. The findings reveal that, for chlorination and chloramination, the average concentration of the five classes of DBPs was ranked as follows (chlorination, chloramination): HAAs (268.1 μg/L, 54.2 μg/L) > THMs (44.0 μg/L, 2.0 μg/L) > HKs (0.7 μg/L, 1.8 μg/L) > NAs (26.5 ng/L, 74.6 ng/L) > Aromatics (20.4 ng/L, 19.5 ng/L). The dominant compounds in THMs, HAAs, and NAs are trichloromethane, dichloroacetic acid, trichloroacetic acid, and nitrosopyrrolidine, respectively. This study highlights a significant positive correlation between DBP generation and UV, SUV, and the double bond equivalents of DOM in the source water. It systematically elucidates DOM molecular composition characteristics and DBP formation potential in high-altitude water sources, shedding light on key factors influencing DBP generation at the molecular level in high-altitude areas.

15. 题目: The critical role of organic matter for cadmium-lead interactions in soil: Mechanisms and risks
文章编号: N24071507
期刊: Journal of Hazardous Materials
作者: Yiren Li, Kai Wang, Sebastian Dötterl, Jianming Xu, Gina Garland, Xingmei Liu
更新时间: 2024-07-15
摘要: Understanding the interaction mechanisms between complex heavy metals and soil components is a prerequisite for effectively forecasting the mobility and availability of contaminants in soils. Soil organic matter (SOM), with its diverse functional groups, has long been a focal point of research interest. In this study, four soils with manipulated levels of SOM, cadmium (Cd) and lead (Pb) were subjected to a 90-day incubation experiment. The competitive interactions between Cd and Pb in soils were investigated using Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray adsorption near-edge structure (XANES) analysis. Our results indicate that Pb competed with Cd for adsorption sites on the surface of SOM, particularly on carboxyl and hydroxyl functional groups. Approximately 22.6 % of Cd adsorption sites on humus were occupied by Pb. The use of sequentially extracted exchangeable heavy metals as indicators for environment risk assessments, considering variations in soil physico-chemical properties and synergistic or antagonistic effects between contaminants, provides a better estimation of metal bioavailability and its potential impacts. Integrating comprehensive contamination characterization of heavy metal interactions with the soil organic phase is an important advancement to assess the environmental risks of heavy metal dynamics in soil compared to individual contamination assessments.

16. 题目: Not all soil carbon is created equal: Labile and stable pools under nitrogen input
文章编号: N24071506
期刊: Global Change Biology
作者: Huadong Zang, Imran Mehmood, Yakov Kuzyakov, Rong Jia, Heng Gui, Evgenia Blagodatskaya, Xingliang Xu, Pete Smith, Haiqing Chen, Zhaohai Zeng, Mingsheng Fan
更新时间: 2024-07-15
摘要: Anthropogenic activities have raised nitrogen (N) input worldwide with profound implications for soil carbon (C) cycling in ecosystems. The specific impacts of N input on soil organic matter (SOM) pools differing in microbial availability remain debatable. For the first time, we used a much‐improved approach by effectively combining the 13C natural abundance in SOM with 21 years of C3–C4 vegetation conversion and long‐term incubation. This allows to distinguish the impact of N input on SOM pools with various turnover times. We found that N input reduced the mineralization of all SOM pools, with labile pools having greater sensitivity to N than stable ones. The suppression in SOM mineralization was notably higher in the very labile pool (18%–52%) than the labile and stable (11%–47%) and the very stable pool (3%–21%) compared to that in the unfertilized control soil. The very labile C pool made a strong contribution (up to 60%) to total CO2 release and also contributed to 74%–96% of suppressed CO2 with N input. This suppression of SOM mineralization by N was initially attributed to the decreased microbial biomass and soil functions. Over the long‐term, the shift in bacterial community toward Proteobacteria and reduction in functional genes for labile C degradation were the primary drivers. In conclusion, the higher the availability of the SOM pools, the stronger the suppression of their mineralization by N input. Labile SOM pools are highly sensitive to N availability and may hold a greater potential for C sequestration under N input at global scale.

17. 题目: Enhancing neonicotinoid removal in recirculating constructed wetlands: The impact of Fe/Mn biochar and microbial interactions
文章编号: N24071505
期刊: Journal of Hazardous Materials
作者: Xiaoyan Tang, Yong Chen, Wei Zheng, Luying Chen, Huanping Liu, Muzi Li, Yang Yang
更新时间: 2024-07-15
摘要: Neonicotinoids pose significant environmental risks due to their widespread use, persistence, and challenges in elimination. This study explores the effectiveness of Fe/Mn biochar in enhancing the removal efficiency of neonicotinoids in recirculating constructed wetlands (RCWs). Results demonstrated that incorporating Fe/Mn biochar into RCWs significantly improved the removal of COD, NH-N, TN, TP, imidacloprid (IMI), and acetamiprid (ACE). However, the simultaneous presence of IMI and ACE in the RCWs hindered the elimination of NH-N, TN, and TP from wastewater. The enhanced removal of nutrients and pollutants by Fe/Mn biochar was attributed to its promotion of carbon, nitrogen, and phosphorus cycling in RCWs, along with its facilitation of the adsorption and biodegradation of IMI and ACE. Metagenomics analysis demonstrated that Fe/Mn biochar altered the structure and diversity of microbial communities in RCWs. A total of 17 biodegradation genes (BDGs) and two pesticide degradation genes (PDGs) were identified within RCWs, with Fe/Mn biochar significantly increasing the abundance of BDGs such as cytochrome P450. The potential host genera for these BDGs/PDGs were identified as , , , , and . This study offers valuable insights into how Fe/Mn biochar enhances pesticide removal and its potential application in constructed wetland systems for treating pesticide-contaminated wastewater.

18. 题目: Biochar amendment shifts bacterial keystone taxa regulating soil phosphorus dynamics
文章编号: N24071504
期刊: Applied Soil Ecology
作者: Jinhuan Deng, Danyu He, Xiaohui Zhu, Yixia Cai, Kunzheng Cai, Jihui Tian
更新时间: 2024-07-15
摘要: Biochar amendment can improve soil phosphorus (P) availability, yet the influence of microbial community structure, especially certain keystone taxa on P dynamics remains uncertain. A pot experiment was conducted on a highly weathered Ferralsol to investigate how the amendment with biochar and P-fertilizer (CK, no biochar and P addition; PP, 30 kg P ha addition; BC, 4 % biochar addition and BP, 30 kg P ha combined with 4 % biochar addition) affect soybean ( max (L.) cv. Huaxia-9) P uptake, soil P dynamics and its association with bacterial community structure and keystone taxa. The biochar-amended treatments (BC and BP) led to a 50–130 % increase in P uptake and a ten-fold rise in labile P proportion compared to treatments without biochar (CK and PP). This could be associated with the incorporation of P from biochar, as well as the altered soil P availability by elevated soil pH, soil organic carbon (SOC), microbial biomass P and alkaline phosphatase activity. Furthermore, biochar amendments altered bacterial community composition by increasing the relative abundance of Gemmatimonadetes, Bacteroidetes and Verrucomicrobia phylum by over three-fold, while decreasing the relative abundance of Chloroflexi and Acidobacteria phylum by over 50 %, compared to the non-biochar treatments. Additionally, the elevated C:P ratio following biochar amendment played a dominant role in shaping the keystone taxa, which was identified as the primarily microbial predictor of soil labile P. Specifically, biochar amendment increased microbial network complexity, inducing a shift in keystone taxa from oligotrophs to copiotrophs, such as Rhizobiales, Sphingomonadales and Rhodospirillales, which are wildly recognized for their roles in soil P mobilization. Taken together, our findings suggested that biochar-induced shift in keystone taxa is one of the major predictors of soil P dynamics, highlighting the potential of harnessing specific keystone taxa for improving soil P availability.

19. 题目: The potential of magnetic biochar prepared by a solvent-free method as a soil amendment: Metal immobilization performance, soil microbial co-occurrence network and community assembly mechanism
文章编号: N24071503
期刊: Journal of Environmental Chemical Engineering
作者: Jiacan Li, Yucan Sun, Mingzhi Fang, Zizhang Guo, Bing Zhang, Tan Chen, Yifei Liu, Ting Yang, Linlan Zhuang
更新时间: 2024-07-15
摘要: Magnetic biochar (MBC) is widely recognized as an effective soil amendment for the immobilization of heavy metals in soils. However, the most commonly used methods currently for manufacturing MBC necessitate the use of iron salt solutions, leading to energy consumption for dehydration and potential environmental risks. Here, we fabricated a magnetic biochar based on the solvent-free method and applied it as a soil passivator at a rate of 5 % (w/w) for 90 days. The metal immobilization performance of MBC was investigated, together with its soil micro-ecological effects including the impacts of MBC application on soil microbial community diversity, composition, co-occurrence network pattern and assembly mechanism. The results showed that MBC treatment significantly decreased the DTPA-extractable Cd and Zn by 54.1 % and 59.5 % (<0.05) after the 90-day incubation, respectively, higher than that of biochar (BC) treatment (25.6 % for Cd and 50.4 % for Zn). The transformation of Cd, Zn and Pb from labile fractions to residual fraction was facilitated in MBC treatment. Besides, MBC application significantly increased soil pH, soil organic matter content and cation exchange capacity (<0.05). The addition of MBC considerably altered the soil bacterial community diversity and composition. Both soil environmental variables and bioavailability of metals shaped microbial communities, while the latter explained more. Compared to CK, the complexity and stability of the co-occurrence network in MBC-amended soil were enhanced. Null model analysis implied that the microbial community assembly was governed by the stochastic process in MBC treatment, while the deterministic process was the dominant mechanism initially. Overall, our findings provide insight into the ecological mechanisms and interactions of soil microbial communities in response to MBC application and demonstrate that MBC is a promising amendment for metal-contaminated soil remediation.

20. 题目: Distribution characteristics of sulfonamide antibiotics between water and extracellular polymeric substances in municipal sludge
文章编号: N24071502
期刊: Environmental Research
作者: Ming Cheng, Chen Shi, Bo-Han Zhao, Tai-Yue Wang, null Nan-Zhang, Ran-Bin Liu, Da-Qi Cao, Xiao-Di Hao
更新时间: 2024-07-15
摘要: The interaction between extracellular polymeric substances (EPS) in municipal sludge and antibiotics in wastewater is critical in wastewater treatment, resource recovery, and sludge management. Therefore, it is increasingly urgent to investigate the distribution coefficient (Log K) of sulfonamide antibiotics (SAs) in EPS, particularly in sludge-derived dissolved organic carbon (DOC) and aqueous phase systems. Herein, through balance experiments, the concentrations of SAs were determined using alkaline extraction EPS (AEPS) and alginate-like extracellular polymer (ALE) systems, and the Log K values were determined. The results showed that the Log K of AEPS was higher than that of ALE, which exhibited a negative K value, indicating an inhibitory effect on dissolution. For the three SAs studied, the Log K values were in the following order: sulfamethoxazole > sulfapyridine > sulfadiazine. This order can be attributed to the differing physicochemical properties, such as polarity, of the SAs. Three-dimensional excitation–emission matrix fluorescence spectra and fitting results indicated a lack of aromatic proteins dominated by tryptophan and humus-like substances in ALE. Meanwhile, the hydrophobic interaction of aromatic proteins dominated by tryptophan was the main driving force in the binding process between AEPS and SAs.

 共 23819 条记录  本页 20 条  本页从 1-20 条  1/1191页  1 2 3 4 5 6  下一页  末页   

本数据库数据来源自各期刊,所有权归属各期刊。数据仅供分享学习,不作商业用途,特此申明。