论文检索

主页 | 软件工具 | 课题库 | 公众号
:



总访问量:1733808

总访客量:86887

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

21. 题目: Long-term effects of nitrogen and phosphorus fertilization on profile distribution and characteristics of dissolved organic matter in fluvo-aquic soil
文章编号: N24071501
期刊: Journal of Environmental Management
作者: Yumei Peng, Lingan Niu, Yalei Hu, Chunpeng Huo, Jia Shi, Zhongmin Fan, Yuxin Yan, Ziyun Zhang, Xiang Wang
更新时间: 2024-07-15
摘要: Dissolved organic matter (DOM) drives numerous biogeochemical processes (e.g. carbon cycling) in agro-ecosystems and is sensitive to fertilization management. Nevertheless, changes in the quantity and quality of DOM in the vertical soil profile following long-term continuous nitrogen (N) and phosphorus (P) inputs remain unclear. In this study, the contents and optical characteristics of DOM along a 2-m soil profile were investigated using a 40-year wheat/maize rotation combined with experiments using different N and P fertilization rates in the North China Plain. The results revealed that the dissolved organic carbon (DOC) content decreased with an increase in soil depths. Compared with that in the control (no fertilization), 40-year N, P, and N + P additions increased the soil DOC content by 26%–69%, except for 270-kg N, and 67.5-kg P treatments. N + P application resulted in higher DOC contents than N-alone and P-alone applications. N, P, and N + P inputs increased or did not affect the aromaticity and hydrophobicity of DOM at 0–40 cm but reduced them from 40 to 200 cm. Compared with that in the control, N, P, and N + P inputs enhanced the content of humic acid-like substances (C1+C2+C3+C4) and decreased the content of protein-like substance (C5). C1 was the dominant component among the five DOM, representing the microbial humic component. Optical indices also indicated that soil DOM primarily originated from microbial sources. Nutrient addition accelerated transformation between complex C1 and simple C5 via promoting microbial activities. These results imply that N and P fertilizers increased the DOM content and altered its composition, thereby potentially affecting the stability of soil organic matter in the agroe-cosystems.

22. 题目: Impact of biochar produced at different pyrolysis conditions on heavy metal contaminated soil
文章编号: N24071408
期刊: Environmental Geochemistry and Health
作者: Hina Chaudhary, Kottapalli Sreenivasa Rao
更新时间: 2024-07-14
摘要:

This study aimed to assess the effectiveness of urban derived biochars such as Sugarcane bagasse (SB), Brinjal Stem (BS), and Citrus Peel (CP) produced at two different pyrolysis conditions (450 and 600 °C for 60 min) for soil heavy metal bioremediation potential. An ex-situ study was conducted to remediate single heavy metal-contaminated SoilRite with lead (Pb), copper (Cu), chromium (Cr) and cadmium (Cd), with biochars applied at different rates. Heavy metal status in soilrite was evaluated using various extraction methods (water-soluble, exchangeable, TCLP (Toxicity Characteristic Leaching Procedure), and PBET (Physiologically Based Extraction Tests)) to determine the biochar treatments' efficacy. The findings show that SB biochar at 450–60 are more effective in immobilizing heavy metals in water-soluble (Cd-100% Pb and Cu-70%), exchangeable (Pb:91%, Cd and Cu by 70–80%) and PBET-extracted forms (Cd-91%, Pb-80%, and Cu-75%), whereas biochar derived from BS (84%) and CP (90%) at 600–60 are more effective in immobilizing TCLP-extracted form of Pb and Cu. Urban derived biochars significantly reduced the toxicity of Pb, Cu, and Cd in various extractable forms and can stabilize and convert them into less accessible forms except for Cr. These extraction methods aid in evaluating environmental risks and influencing remediation strategies for soil heavy metal pollution. Urban biochar, as a cost-effective and eco-friendly solution, significantly solves this issue, facilitating sustainable waste management.

Graphical abstract

23. 题目: Unacclimated activated sludge improved nitrate reduction and N2 selectivity in iron filling/biochar systems
文章编号: N24071407
期刊: Science of the Total Environment
作者: Yating Chang, Jizhong Meng, Yuansheng Hu, Shasha Qi, Zhenhu Hu, Guangxue Wu, Jinhong Zhou, Xinmin Zhan
更新时间: 2024-07-14
摘要: Iron (Fe)-based denitrification is a proven technology for removing nitrate from water, yet challenges such as limited pH preference range and low N selectivity (reduction of nitrate to N) persist. Adding biochar (BC) can improve the pH preference range but not N selectivity. This study aimed to improve nitrate reduction and N selectivity in iron filling/biochar (Fe/BC) systems with a simplified approach by coupling unacclimated microbes (M) in the system. Factors such as initial pH, Fe/BC ratio, and Fe/BC dosage on nitrate removal efficiency and N selectivity were evaluated. Results show that the introduction of microbes significantly enhanced nitrate removal and N selectivity, achieving 100 % nitrate removal and 79 % N selectivity. The Fe/BC/M system exhibited efficient nitrate reduction at pH of 2–10. Moreover, the Fe/BC/M system demonstrated an improved electrochemical active surface area (ECSA), lower electron transfer resistance and lower corrosion potential, leading to enhanced nitrate reduction. The high i value in Fe/BC/M system means more H could be generated, thus improving the N selectivity. This study provides valuable insights into a novel approach for effective nitrate removal, offering a potential solution to the environmental challenges posed by excessive nitrate in wastewater, surface water and ground water.

24. 题目: Molecular weight insight into critical component contributing to reverse osmosis membrane fouling in wastewater reclamation
文章编号: N24071406
期刊: npj Clean Water
作者: Yuan Bai, Yinhu Wu, Ziwei Zhang, Yu Mao, Ruining Wang, Xin Tong, Song Xue, Haobin Wang, Hongying Hu
更新时间: 2024-07-14
摘要:

Molecular weight (MW) of organics was one of the important factors influencing membrane fouling propensity. This study identified critical foulants of reverse osmosis (RO) membranes in reclaimed water by MW fractionation. MW > 10 kDa component was identified as the critical fouling contributor (CFC) in secondary effluent (SE), which accounted for only 13 ± 5% of dissolved organic carbon (DOC) but contributed to 86 ± 11% of flux decline. Throughout 12-month monitoring, SE and MW > 10 kDa component showed a similar fouling variation tendency: apparently higher fouling potential in winter and lower in summer, while MW < 10 kDa component presented minor fouling changes. Morphology of membrane fouled by CFC characterized a smooth and thick foulant layer on membrane surface. CFC was mainly composed of proteins and polysaccharides, and a protein-polysaccharide-protein “sandwich” fouling layer structure was preferentially formed on membrane surface. extended Derjaguin–Landau-Verwey–Overbeek (xDLVO) analysis demonstrated that strong attractive interactions between CFC and membrane surface dominated the fouling process. Furthermore, computational fluid dynamics (CFD) simulation revealed strong filtration resistance of CFC, confirming its significant fouling potential. Dual effects including attractive interactions and advantageous ridge-and-valley surface appearance accounted for the significant fouling propensity of MW > 10 kDa component and glean valuable insights into RO fouling mechanisms of reclaimed water in practical application.

25. 题目: Nutrients recovery from livestock wastewater by batch and gas bubble-column studies with biochar, nano-composite material, and ammonium magnesium phosphate hydrate
文章编号: N24071405
期刊: Journal of Environmental Management
作者: Payal Maharathi, Kiran Kumar Eripogu, Shang Lien Lo
更新时间: 2024-07-14
摘要: The breeding of livestock raises substantial environmental concerns, especially the efficient management of nutrients and pollution. This research is designed to assess the potency of char and modified char in diluting nutrient concentrations in livestock wastewater. The characteristics of graphene oxide, struvite, and calcium-modified char were inspected, defining their efficacy in both batch and bed-column investigations of nutrient sorption. Various factors, including sorption capacity, time of contact, ion levels, a decrease in ion levels over time, and sorption kinetics, have been considered, along with their appropriateness for respective models. The first evaluation of the options concluded that 600 °C char was better since it exhibited higher removal efficiency. Modified char sorption data at 600 °C was used to adjust the models “PSOM, Langmuir”, and “Thomas”. The models were applied to both batch and bed-column experiments. The maximum phosphate sorption was 110.8 mg/g, 85.73 mg/g, and 82.46 mg/g for B-GO, B-S, and B-C modified chars respectively, in the batch experiments. The highest phosphate sorption in column experiments, at a flow rate of 400 μl/min, was 51.23 mg per 10 g of sorbent. This corresponds to a sorption rate of 5.123 mg/g. B-GO and B-S modified chars showed higher sorption capacities; this was observed in both the batch and bed-column studies. This displayed the capability of graphene oxide and struvite-modified chars for efficient ion and nutrient uptake, whether in single or multi-ion environments, making them a very good candidate for nutrient filtration in livestock wastewater treatment. Additionally, B-GO char enhanced the sorption of phosphate, resulting in augmented seed germination and seedling growth. These results reveal that B-GO char can be used as a possible substitute for chemical fertilizers.

26. 题目: Biodegradability of Unheated and Laboratory Heated Dissolved Organic Matter
文章编号: N24071404
期刊: Environmental Science: Processes & Impacts
作者: Saraf Islam Promi, Courtney Gardner, Amanda K Hohner
更新时间: 2024-07-14
摘要: Following wildfires, partially combusted biomass remains on the forest floor and erosion from the landscape can release dissolved pyrogenic organic matter (dPyOM) to surface waters. Therefore, post-fire alterations to dissolved organic matter (DOM) in aquatic systems may play a vital role in DOM stability and biogeochemical cycles. Dissolved PyOM biodegradation remains poorly understood and is expected to vary with combustion temperature and fuel source. In this study laboratory heating and leaching of forest floor materials (soil and litter) were used to compare the biodegradability of unheated, low (250°C), and moderate (450°C) temperature leachates. Inoculation experiments were performed with river microbes. Dissolved organic carbon (DOC), dissolved organic nitrogen (DON), inorganic nitrogen, and DOM optical properties were monitored for 38 days. Inoculation experiments showed significantly greater DOC biodegradation of low and moderate temperature samples (64% and 71%, respectively) compared to unheated samples (32%). The greater DOC biodegradation may be explained by lower molecular weight DOM composition of heated leachates which was supported by higher initial E2/E3 ratios (absorbance at 250 nm/365 nm). Further, the observed decrease in the E2/E3 ratio after incubation suggests biodegradation of smaller compounds. This trend was greater for heated samples than unheated DOM. Specific ultraviolet absorbance increased after incubation, suggesting biodegradation of aliphatic compounds. Inoculated moderate temperature samples showed the greatest DON degradation (74%), followed by low temperature (58%) and unheated (51%) samples. Overall, results suggest that low and moderate temperature dPyOM was more biodegradable than unheated DOM, which may have implications for aquatic biogeochemical cycling, ecosystem function, and water quality in fire-impacted watersheds.

27. 题目: Enhanced removal of antibiotics and heavy metals in aquatic systems using spent mushroom substrate-derived biochar integrated with Herbaspirillum huttiense
文章编号: N24071403
期刊: Environmental Science and Pollution Research
作者: Xiaorong Zhang, Zongqiang Gong, Xin Chen, Richard A Ludlow, Shuhai Guo
更新时间: 2024-07-14
摘要:

A novel integrated removal strategy was developed to enhance the concurrent elimination of copper (Cu), zinc (Zn), oxytetracycline (OTC), and enrofloxacin (ENR) from the aqueous environments. The underlying adsorption mechanisms of spent mushroom substrate (SMSB) and the Herbaspirillum huttiense strain (HHS1), and their efficacy in removing Cu, Zn, OTC, and ENR was also examined. Results showed that the SMSB-HHS1 composite stabilized 29.86% of Cu and 49.75% of Zn and achieved removal rates of 97.95% for OTC and 59.35% for ENR through a combination of chemisorption and biodegradation. Zinc did not affect Cu adsorption, and ENR did not impact the adsorption of OTC on SMSB. However, the co-presence of OTC and ENR modified the adsorption behaviors of both Cu and Zn. Copper and Zn enhanced the adsorption of OTC and ENR by serving as bridging agents, facilitating the interaction between the contaminants and SMSB. Conversely, OTC and ENR inhibited the adsorption process of Cu by obstructing its interaction with the SMSB and occupying the oxygen-containing functional groups. The ‒OH (3415 cm−1) and C–O–C (1059 cm−1) functional groups were identified as the principal active sites to form hydrogen bonds and interact with Cu and Zn, leading to the formation of CuP4O11 and Zn4CO3(OH)6H2O. HHS1 also enhanced antibiotic removal through biodegradation, as evidenced by the decrease of ‒C‒O and increase of ‒C = O groups. This study underscores the innovative potential of the SMSB-HHS1 composite, offering a sustainable approach to addressing multifaceted pollution challenges in the aquatic environments.

28. 题目: Impact of Biochar Addition Levels on Remediation of Uranium-Stressed Soil: Evidence from 16S rDNA and Metabolomics
文章编号: N24071402
期刊: ACS ES&T Engineering
作者: Huachuan Feng, Yilin Wang, Xiaofeng Wang, Nan Li, Qiuyang Li, Jin Li, Xiaoming Chen, Qing Wang, Wenkun Zhu
更新时间: 2024-07-14
摘要: The addition of soil amendments to facilitate plant-based remediation of soil contaminated with radioactive nuclides is considered a promising approach. Here, we tested different levels of biochar to help clean uranium-contaminated soil in the potted plants. Adding 1% biochar had the best results in deactivating uranium, increasing soil enzyme activity, and promoting ryegrass growth. Microbiological and metabolomic analysis further revealed that 1 wt % biochar significantly enhanced the abundance of microorganisms such as Actinobacteriota and Myxococcota and accelerated the production of differential metabolites such as lipids and lipid-like molecules, organic acids and derivatives, and organic oxygen compounds. The analysis of biological and nonbiological interaction networks indicates that the coordinated interaction between bacteria, enzymes, and metabolites significantly improves the expression level of the ABC transporter’s metabolic pathway. This enhances the resistance of living cells to uranium and maintains system homeostasis under uranium stress. This study provides an example of the application of biochar-assisted phytoremediation and offers theoretical guidance for the remediation of soil contaminated with radioactive nuclides.

29. 题目: Transformation of As and Cd associated with Fe–Mn-modified biochar during simultaneous remediation on the contaminated soil
文章编号: N24071401
期刊: Environmental Science and Pollution Research
作者: Gai Zeng, Yang Ping, Hao Xu, Zhihui Yang, Chongjian Tang, Weichun Yang, Mengying Si, Chukwuma Arinzechi, Lin Liu, Fangshu He, Xiaoming Zhang, Qi Liao
更新时间: 2024-07-14
摘要:

Here, Fe- and Mn-modified biochar (BC-Fe–Mn) was applied to simultaneously stabilize As and Cd in the contaminated soil. The removal efficiencies for NaHCO3-extractable As and DTPA-extractable Cd by BC-Fe–Mn were 60.8% and 49.6%, respectively. The speciation analyses showed that the transformation to low-crystallinity Fe-bound (F3) As, Fe–Mn oxide-bound (OX) of Cd, and residual As and Cd was primarily attributed to stabilizing the two metal(loid)s. Moreover, the correlation analyses showed that the increase of As in F3 fraction was significantly and positively associated with the increase of OX fraction Mn (r = 0.64). Similarly, OX fraction Cd was increased notably with increasing OX fraction Fe (r = 0.91) and OX fraction Mn (r = 0.76). In addition, a novel dialysis experiment was performed to separate the reacted BC-Fe–Mn from the soil for intensively investigating the stabilization mechanisms for As and Cd by BC-Fe–Mn. The characteristic crystalline compounds of (Fe0.67Mn0.33)OOH and Fe2O3 on the surface of BC-Fe–Mn were revealed by SEM–EDS and XRD. And FTIR analyses showed that α-FeOOH, R-COOFe/Mn+, and O–H on BC-Fe–Mn potentially served as the reaction sites for As and Cd. A crystalline compound of MnAsO4 was found in the soil treated by BC-Fe–Mn in the dialysis experiment. Thus, our results are beneficial to deeper understand the mechanisms of simultaneous stabilization of As and Cd by BC-Fe–Mn in soil and support the application of the materials on a large scale.

30. 题目: Dynamics and source characterization of chromophoric dissolved organic matter (CDOM) in a tropical monsoon driven lagoon
文章编号: N24071309
期刊: Marine Chemistry
作者: Sambit Singh, Susmita Raulo, Tamoghna Acharyya, Deepak R Mishra, Abhishek Kumar, Anu Gopinath, Pradipta R Muduli, Gurdeep Rastogi
更新时间: 2024-07-13
摘要: While there is a significant body of research on the dynamics of chromophoric dissolved organic matter (CDOM) in coastal and offshore waters, our understanding of CDOM dynamics in tropical inland water bodies remains limited. To bridge this knowledge gap, a monthly in-situ investigation was carried out at 33 stations along a monsoon driven lagoon, Chilika, on the southeast coast of India for one year i.e., from July 2018 to June 2019. CDOM absorption at 440 nm [aCDOM(440)] data were analyzed as a proxy for CDOM concentration which varied between a range of 0.04–65.14 m with an average value of 2.77 ± 5.23 m. A gradient in aCDOM(440) was observed from the river discharge dominated shallower northern sector (4.91 ± 8.32) m to the more isolated and less fresh water influenced deeper southern sector (1.21 ± 1.55) m. Spectral slope (S), spectral slope ratio (S), and molecular weight proxy (M) were computed to understand the possible source and fate of CDOM in the lagoon. The average spectral slope of S and S vary between 0.002 and 0.096 nm and 0.001–0.095 nm, respectively. The (S) and (M) values ranged between of 0.01–6.81 and 0.31–52.28. It was observed that large-sized, high molecular weight CDOM from terrestrial origin was prevalent during monsoon with lower (S), (S), and (M)values. In contrast, lower molecular weight CDOM fractions were prevalent during pre- and post-monsoon which were mainly of autochthonous origin with higher (S), (S), and (M) values. Our findings indicate significant spatio-temporal variations of CDOM in Chilika Lagoon, influenced by the monsoon-driven influx of freshwater and the mixing of fresh and marine water. In-situ changes in CDOM are likely shaped by microbial breakdown and photodegradation.

31. 题目: Spatial-temporal impacts of invasive Spartina anglica on the rates and pathways of organic carbon mineralization and resulting C-Fe-S cycles in the intertidal wetland of the Han River Estuary, Yellow Sea
文章编号: N24071308
期刊: Marine Pollution Bulletin
作者: Sung-Uk An, Ayeon Choi, Ju-Wook Baek, Hyeonji Lee, Jisu Park, Jin-Sook Mok, Jae Seong Lee, Chang-Keun Kang, Jung-Ho Hyun
更新时间: 2024-07-13
摘要: To elucidate the spatial-temporal impact of invasive saltmarsh plant on the biogeochemical processes in coastal wetlands, we investigated the rates and partitioning of organic carbon (C) mineralization in three representative benthic habitats: (1) vegetated sediments inhabited by invasive (SA); vegetated sediments by indigenous ; and (3) unvegetated mud flats. Microbial metabolic rates were greatly stimulated at the SA site during the active growing seasons of , indicating that a substantial amount of organic substrates was supplied from the high below-ground biomass of . At the SA site, sulfate reduction dominated the C mineralization pathways during the plant growing season, whereas iron reduction dominated during the non-growing season. Overall, due to its greater biomass and longer growing season than native , the expansion of invasive is likely to greatly alter the C-Fe-S cycles and carbon storage capacity in the coastal wetlands.

32. 题目: Algal-mediated nitrogen removal and sustainability of algal-derived dissolved organic matter supporting denitrification
文章编号: N24071307
期刊: Bioresource Technology
作者: Huiqin Wan, Kangpeng Wang, Xianxin Luo, Chao Zhang, Kai Deng, Shuseng Ling, Jingming Xie, Qi Luo, Xu Lei, Lin Ding
更新时间: 2024-07-13
摘要: Algae-mediated nitrogen removal from low carbon nitrogen (C/N) wastewater techniques has garnered significant attention due to its superior autotrophic assimilation properties. This study investigated the ammonium-N removal potential of four algae species from low C/N synthetic wastewater. Results showed that 95 % and 99 % of ammonium-N are eliminated at initial concentrations of 11.05 ± 0.98 mg/L and 42.51 ± 2.20 mg/L with little nitrate and nitrite accumulation. The compositions of secreted algal-derived dissolved organic matter varied as C/N decreased and showed better bioavailability for nitrate-N removal by sp. SZF15 without pre-oxidation, achieving an efficiency of 99 %. High-throughput sequencing revealed that the aquatic microbial communities, dominated by , , and , remain relatively stable across different C/N, aligning with the underlying metabolic pathways. These findings may provide valuable insights into the sustainable elimination of multiple nitrogen contaminants from low C/N wastewater.

33. 题目: Novel recycling strategy for distillers’ grains waste: prolonged biochar aging promotes cadmium immobilization and lettuce growth by regulating soil nutrient availability and bacterial composition
文章编号: N24071306
期刊: Plant and Soil
作者: Jieming Li, Yu Zhao, Guoren Xu, Suyi Zhang, Bo Deng, Pan Song, Hui Qin
更新时间: 2024-07-13
摘要:

Background and aims

Converting distillers’ grains (DGs) into biochar (BC) is sustainable option for waste-recycling, but how different aging times and application rates DG-derived BC (DG-BC) influenced lettuce growth and cadmium (Cd) uptake in soil was unclear. This study explored DG-BC rate- and aging time-dependent effect on lettuce growth and Cd uptake, and effect mechanisms from insights of soil nutrient and Cd bioavailability, lettuce metabolic activity and rhizospheric bacterial composition.

Methods

Pot experiments involved three DG-BC rates (1%, 2%, 4%) and three aging times (0, 3, 6 months) in Cd-polluted soil. Effects of different DG-BC rates and different aging times on lettuce growth, metabolic activity and Cd uptake, soil nutrient and Cd bioavailability, and rhizospheric bacterial composition were explored.

Results

Rising DG-BC rate and aging time increasingly enhanced lettuce growth, antioxidant activities and soil nutrient availability, while progressively decreased Cd bioavailability and Cd uptake by lettuce. Sphingomonas, RB41 and Nitrospira abundance in rhizosphere soil could be enhanced at higher DG-BC rate, and DG-BC aging in soil further promoted or maintained their enhanced abundance at higher DG-BC rate. Thus, the enhanced abundance of these keystone genera played crucial roles in promoting lettuce growth, soil nutrient availability, and decreasing Cd bioavailability and uptake.

Conclusions

Applying 4% DG-BC with 6 month-aging maximized lettuce growth and minimized Cd uptake by maximally decreasing Cd bioavailability, increasing soil nutrient availability and regulating rhizospheric bacterial composition, thus becoming a suitable DG-BC application strategy to promote lettuce production and mitigate Cd-induced health risk through lettuce consumption.

34. 题目: Organic carbon-based amendments effectively reclaim post-tin mining site via modified soil organic carbon characteristics
文章编号: N24071305
期刊: Plant and Soil
作者: Orracha Sae-Tun, Rizki Maftukhah, Sahid Susanto, Ngadisih Ngadisih, Murtiningrum Murtiningrum, Rebecca Hood-Nowotny, Axel Mentler, Gernot Bodner, Katharina M Keiblinger
更新时间: 2024-07-13
摘要:

Purpose

The complex process of post-mining land reclamation poses a great challenge in combatting land degradation and food insecurity. In this study, a field experiment was conducted to determine the effects of different soil amendments on soil organic carbon (SOC) characteristics and plant biomass to reclaim a highly degraded soil after tin-mining.

Methods

Quantity and quality of SOC, annual plant biomass, and their relationships were determined over four years in post-tin mining soil that had been treated with six different soil amendments: control, dolomite, compost, charcoal, charcoal with compost and charcoal with sawdust.

Results

Charcoal-compost application led to the highest increase in SOC stocks, followed by compost application. It enhanced annual plant biomass to twice that of the control treatment. In contrast to organic soil amendments, dolomite tended to cause SOC stock losses over time. Dissolved organic carbon exhibited a highly dynamic pattern, with a tendency to decrease over time. Dolomite and charcoal application induced SOC chemical composition changes distinct from other treatments. The potential interactions between amendment materials and time as well as crop species were observed for SOC characterization.

Conclusions

Charcoal-compost combination with regular compost application was recommended to reclaim the soil for promoting SOC accumulation whilst sustaining crop production.

35. 题目: Preference and regulation mechanism mediated via mobile genetic elements for antibiotic and metal resistomes during composting amended with nano ZVI loaded on biochar
文章编号: N24071304
期刊: Environmental Pollution
作者: Yucheng Zhou, Qunliang Li
更新时间: 2024-07-13
摘要: This study assessed the effectiveness of nano zero-valent iron loaded on biochar (BC-nZVI) during swine manure composting. BC-nZVI significantly reduced the abundance of antibiotic resistance genes (ARGs), metal resistance genes (MRGs), and mobile genetic elements (MGEs). BC-nZVI modified the preference of MGEs to carry ARGs and MRGs, and the corrosion products of BC-nZVI could destroy cell structure, hinder electron transfer between cells, and weaken the association between ARGs, MRGs, and host bacteria. Functional genes analysis revealed that BC-nZVI down-regulated the abundance of genes affecting the transmission and metabolism of ARGs and MRGs, including type IV secretion systems, transporter systems, two-component systems, and multidrug efflux pumps. Furthermore, the BC-nZVI decreased genes related to flagella and pili production and cell membrane permeability, thereby hindering the transfer of ARGs, MRGs, and MGEs in the environment. Redundancy analysis demonstrated that changes in the microbial community induced by BC-nZVI were pivotal factors impacting the abundance of ARGs, MRGs, and MGEs. Overall, this study confirmed the efficacy of BC-nZVI in reducing resistance genes during swine manure composting, offering a promising environmental strategy to mitigate the dissemination of these contaminants.

36. 题目: Improved organic matter biodegradation through pulsed H2 injections during in situ biomethanation
文章编号: N24071303
期刊: Bioresource Technology
作者: M Mahieux, Q Aemig, C Richard, J-P. Delgenès, M Juge, E Trably, R Escudié
更新时间: 2024-07-13
摘要: During biomethanation, microbial communities can convert complex Organic Matter (OM) and H into CH. OM biodegradation was compared between Anaerobic Digestion (AD) and biomethanation, in semi-continuous processes, using two inocula from the digester (D) and the post-digester (PoD) of an AD plant. The impact of H on OM degradation was assessed using a fractionation method. Operational parameters included 20 days of hydraulic retention time and 1.5 g.L.d of organic loading rate. During biomethanation, 485 NmL of H were injected for each feeding (3 times a week). Maximum organic COD removal was 0.6 gCOD in AD control and at least 1.6 gCOD for biomethanation. Therefore, COD removal was 2.5 times higher with H injections. These results bring out the potential of H injections during AD, not only for CO consumption but also for better OM degradation.

37. 题目: Photolytic Mass Loss of Humic Substances Measured with a Quartz Crystal Microbalance
文章编号: N24071302
期刊: ACS Earth and Space Chemistry
作者: Mingrui Sun, Geoffrey D Smith
更新时间: 2024-07-13
摘要: Laboratory studies have shown that photolytic mass loss can be a significant sink for secondary organic aerosol (SOA). Here, we use a quartz crystal microbalance to measure mass loss of Suwannee River Humic Acid (SRHA) and Suwannee River Fulvic Acid (SRFA), surrogates for SOA, exposed to 254, 300, and 405 nm radiation over the course of 24 h. We find that the photolytic mass loss rates of these materials are comparable to those for laboratory-generated limonene and toluene SOA material from the study of Baboomian et al, ACS Earth Space Chem. 2020, 4, 1078. Scaling our results to ambient conditions, we estimate that humic substances in aerosols can lose as much as 8% by mass in the first day of exposure in the atmosphere, equivalent to 0.025% of JNO2, the photolysis rate of nitrogen dioxide. By using zero air instead of nitrogen, we also find that the presence of oxygen accelerates the photolytic mass loss rate by a factor of 2 to 4 at all wavelengths suggesting a potential role for reactive oxygen species. UV photolysis of an aqueous SRFA solution demonstrated both photobleaching at UV wavelengths and photoenhancement at visible wavelengths. Ultrahigh-resolution mass spectrometric analysis showed that condensed-phase SRFA photolysis led to decreased intensity in the 100–300 m/z range while aqueous SRFA photolysis resulted in an increase in intensity in the same range. This work reaffirms that photolytic mass loss is a potentially significant sink for SOA, but only on the time scale of a day or two and demonstrates that SRHA and SRFA are suitable surrogates for atmospheric SOA with respect to photolytic mass loss.

38. 题目: A nature‐inclusive future with healthy soils? Mapping soil organic matter in 2050 in the Netherlands
文章编号: N24071301
期刊: European Journal of Soil Science
作者: Anatol Helfenstein, Vera L Mulder, Mirjam J D Hack‐ten Broeke, Bas C Breman
更新时间: 2024-07-13
摘要: Nature‐inclusive scenarios of the future can help address numerous societal challenges related to soil health. As nature‐inclusive scenarios imply sustainable management of natural systems and resources, land use and soil health are assumed to be mutually beneficial in such scenarios. However, the interplay between nature‐inclusive land use scenarios and soil health has never been modelled using digital soil mapping. We predicted soil organic matter (SOM), an important indicator of soil health, in 2050, based on a recently developed nature‐inclusive scenario and machine learning in 3D space and time in the Netherlands. By deriving dynamic covariates related to land use and the occurrence of peat for 2050, we predicted SOM and its uncertainty in 2050 and assessed SOM changes between 2022 and 2050 from 0 to 2 m depth at 25 m resolution. We found little changes in the majority of mineral soils. However, SOM decreases of up to 5% were predicted in grasslands used for animal‐based production systems in 2022, which transitioned into croplands for plant‐based production systems by 2050. Although increases up to 25% SOM were predicted between 0 and 40 cm depth in rewetted peatlands, even larger decreases, on reclaimed land even surpassing 25% SOM, were predicted on non‐rewetted land in peat layers below 40 cm depth. There were several limitations to our approach, mostly due to predicting future trends based on historic data. Furthermore, nuanced nature‐inclusive practices, such as the adoption of agroecological farming methods, were too complex to incorporate in the model and would likely affect SOM spatial variability. Nonetheless, 3D‐mapping of SOM in 2050 created new insights and raised important questions related to soil health behind nature‐inclusive scenarios. Using machine learning explicit in 3D space and time to predict the impact of future scenarios on soil health is a useful tool for facilitating societal discussion, aiding policy making and promoting transformative change.

39. 题目: Joint effect of black carbon deriving from wheat straw burning and plastic mulch film debris on the soil biochemical properties, bacterial and fungal communities
文章编号: N24071213
期刊: Science of the Total Environment
作者: Xiaoyan Yuan, Shuai Ma, Huanhuan Geng, Manman Cao, Huilun Chen, Beihai Zhou, Rongfang Yuan, Shuai Luo, Ke Sun, Fei Wang
更新时间: 2024-07-12
摘要: Black carbon (BC) formed after straw burning remains in farmland soil and coexists with plastic mulch film (PMF) debris. It is unclear how BC influences soil multifunctionality in the presence of PMF debris. In this study, we determined the joint effects of BC and PMF debris on soil biochemical properties and microbial communities. We conducted a soil microcosm experiment by adding BC formed by direct burning of wheat straw and PMF debris (polyethylene (PE) and biodegradable PMF (BP)) into soil at the dosages of 1 %, and soils were sampled on the 15th, 30th, and 100th day of soil incubation for high-throughput sequencing. The results showed that the degradation of PMF debris was accompanied by the release of microplastics (MPs). BC decreased NH-N (PE: 68.63 %; BP: 58.97 %) and NO-N (PE: 12.83 %; BP: 51.37 %) and increased available phosphorus (AP) (PE: 79.12 %; BP: 26.09 %) in soil containing PMF debris. There were significant differences in enzyme activity among all the treatments. High-throughput sequencing indicated that BC reduced bacterial and fungal richness and fungal diversity in PMF debris-exposed soil, whereas PMF debris and BC resulted in significant changes in the proportion of dominant phyla and genera of bacteria and fungi, which were affected by incubation time. Furthermore, BC affected microorganisms by influencing soil properties, and pH and N content were the main influencing factors. In addition, FAPRPTAX analysis indicated that BC and PMF debris affected soil C and N cycling. These findings provide new insights into the response of soil multifunctionality to BC and PMF debris.

40. 题目: S-containing molecular markers of dissolved organic carbon attributing to riverine dissolved methane production across different land uses
文章编号: N24071212
期刊: Water Research
作者: Peipei Zhang, Lu Zhang, Fang Wang, Nengwang Chen, Weijin Yan, Jianing Wang, Dongsheng Wang, Xinghui Xia
更新时间: 2024-07-12
摘要: The emission of methane (CH) from streams and rivers contributes significantly to its global inventory. The production of CH is traditionally considered as a strictly anaerobic process. Recent investigations observed a “CH paradox” in oxic waters, suggesting the occurrence of oxic methane production (OMP). Human activities promoted dissolved organic carbon (DOC) in streams and rivers, providing significant substrates for CH production. However, the underlying DOC molecular markers of CH production in river systems are not well known. The identification of these markers will help to reveal the mechanism of methanogenesis. Here, Fourier transform ion cyclotron mass spectrometry and other high-quality DOC characterization, ecosystem metabolism, and in-situ net CH production rate were employed to investigate molecular markers attributing to riverine dissolved CH production across different land uses. We show that endogenous CH production supports CH oversaturation and positively correlates with DOC concentrations and gross primary production. Furthermore, sulfur ()-containing molecules, particularly S-aliphatics and S-peptides, and fatty acid-like compounds (e.g., acetate homologs) are characterized as markers of water-column aerobic and anaerobic CH production. Watershed characterization, including riverine discharge, allochthonous DOC input, turnover, as well as autochthonous DOC, affects the CH production. Our study helps to understand riverine aerobic or anaerobic CH production relating to DOC molecular characteristics across different land uses.

 共 23819 条记录  本页 20 条  本页从 21-40 条  2/1191页  首页 上一页  1 2 3 4 5 6 7  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。