论文检索

主页 | 软件工具 | 课题库 | 公众号
:



总访问量:1524059

总访客量:62200

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

101. 题目: Introducing N2-fixing tree species into Eucalyptus plantations increases organic phosphorus transformation but decreases its accumulation within aggregates in subtropical China
文章编号: N24041301
期刊: Plant and Soil
作者: Haocheng Xu, Yeming You, Yi Wang, Guannv Gao, Angang Ming, Xueman Huang
更新时间: 2024-04-13
摘要:

Background and aims

Soil organic phosphorus (Po) fractions were deemed as potentially significant reservoirs of plant-available phosphorus, profoundly influenced by the physiochemical and biological characteristics of soil. Here we clarify how soil Po fractions and transformation in topsoil aggregates after introducing N2-fixing tree species into Eucalyptus plantation.

Methods

We measured different Po fractions and used phospholipid fatty acids (PLFAs) and four extracellular enzymes activities as bioindicators of soil microbiota and function, respectively. The research was carried out within a 15-years of monoculture Eucalyptus urophylla plantation (PP) and mixed plantation (MP) of Eucalyptus urophylla × Acacia mangium.

Results

The mean weight diameter (MWD) and geometric mean diameter (GMD were significantly greater in MP than PP. Soil organic carbon (SOC), total nitrogen (TN), NO3-N, C:P and N:P ratios were notably increased but Po content decreased significantly in bulk soil and all aggregates except Po in the <0.25 mm aggregate in MP than PP. Furthermore, the PLFA contents of total microbes, bacteria, and fungi were more abundant in bulk and aggregate soils in MP than PP. Enzyme activities related to N and P cycles showed significant improvement in bulk and most aggregates in MP than PP.

Conclusions

Our findings extend the evidence that promoting soil Po transformation may be related to the increasing of N availability, SOC, pH, fungi, and AMF colonization. Taken together, our results highlighted the soil Po fractions response to long term N2-fixing tree species application might be a suitable strategy through efficient management of Po in subtropical Eucalyptus plantations.

102. 题目: Appearance of Recalcitrant Dissolved Black Carbon and Dissolved Organic Sulfur in River Waters Following Wildfire Events
文章编号: N24041115
期刊: Environmental Science & Technology
作者: Yanghui Xu, Xintu Wang, Qin Ou, Zhongbo Zhou, Jan Peter van der Hoek, Gang Liu
更新时间: 2024-04-11
摘要: Increasing wildfire frequency, a consequence of global climate change, releases incomplete combustion byproducts such as aquatic pyrogenic dissolved organic matter (DOM) and black carbon (DBC) into waters, posing a threat to water security. In August 2022, a series of severe wildfires occurred in Chongqing, China. Samples from seven locations along the Yangtze and Jialing Rivers revealed DBC, quantified by the benzene poly(carboxylic acid) (BPCA) method, comprising 9.5–19.2% of dissolved organic carbon (DOC). High concentrations of BPCA-DBC with significant polycondensation were detected near wildfire areas, likely due to atmospheric deposition driven by wind. Furthermore, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) revealed that wildfires were associated with an increase in condensed aromatics, proteins, and unsaturated hydrocarbons, along with a decrease in lignins. The condensed aromatics primarily consisted of dissolved black nitrogen (DBN), contributing to abundant high-nitrogen-containing compounds in locations highly affected by wildfires. Meanwhile, wildfires potentially induced the input of recalcitrant sulfur-containing protein-like compounds, characterized by high oxidation, aliphatic nature, saturation, and low aromaticity. Overall, this study revealed the appearance of recalcitrant DBC and dissolved organic sulfur in river waters following wildfire events, offering novel insights into the potential impacts of wildfires on water quality and environmental biogeochemistry.

103. 题目: Concentration and compositional controls on degradation of permafrost-derived dissolved organic matter on the Qinghai–Tibetan Plateau
文章编号: N24041114
期刊: Limnology and Oceanography Letters
作者: Yinghui Wang, Yasong Wang, Lulu Han, Amy M McKenna, Anne M Kellerman, Robert G M Spencer, Yuanhe Yang, Yunping Xu
更新时间: 2024-04-11
摘要: Understanding the fate of permafrost-derived dissolved organic matter (DOM) is critical for unraveling its role in carbon cycling. However, it remains unclear whether the high lability of permafrost-derived DOM can be attributed to intrinsic chemical properties or elevated carbon concentrations. We investigated the dynamics of permafrost DOM from the Qinghai–Tibetan Plateau using both biodegradation and photodegradation experiments. Biodegradation and photodegradation of permafrost-derived DOM exhibited distinct qualitative preferences for specific chemical groups (i.e., peptide-like and aromatics, respectively). Notably, reducing the initial concentration of dissolved organic carbon (DOC) by half and a quarter resulted in shifts in biodegradable DOC content from 11.2% to 11.5% and 8.5%, respectively, accompanied by a corresponding decrease in the biodegradation rate from 0.11 to 0.06 and 0.03. This insight highlights the importance of recognizing the interplay between DOM quality and concentration and bears broader significance for our understanding of the fate of permafrost-derived DOM in natural ecosystems.

104. 题目: In-situ removal of microcystin aeruginosa and microcystin-LR by biochar supported sulfide nZVI via persulfate activation: Performance, mechanism and degradation pathway
文章编号: N24041113
期刊: Chemical Engineering Journal
作者: Junfang Shen, Guoxian Yang, Yile Dai, Yuqian Cui, Fanlong Kong, Sen Wang
更新时间: 2024-04-11
摘要: As a hepatotoxin generated by the excessive proliferation of , MicrocystinLR (MC-LR) has posed serious threat to humans and wildlife. In this study, biochar supported sulfide nZVI and persulfate sustained-release agent (S-nZVI-BC/PSSA) were prepared to simultaneously remove MC-LR and . Batch experiments showed that the removal efficiency of MC-LR (100 μg/L) by S-nZVI-BC/PSSA could reach 92.0 % when the BC pyrolysis temperature, the Fe/C mass ratio and the Fe/S molar ratio were 700 °C, 1:2 and 40:1, respectively. According to the results of EPR and density functional theory (DFT), the carbon–carbon conjugated diene bond (C = C-C = C) on Adda were most vulnerable to attack by the free radicals such as •OH and SO• generated by S-nZVI-BC/PSSA. The results of reactor experiments indicated that S-nZVI-BC/PSSA had good removal effect on MC-LR and . According to the transcriptome analysis, S-nZVI-BC/PSSA led to the disorder of cell metabolic process by up-regulating ATP and pigment synthesis genes and down-regulating photosynthesis genes, eventually inhibiting the growth of and even causing their death. In addition, the up-regulation of biological transport processes could enhance the release of MC-LR from , which was completely removed by S-nZVI-BC/PSSA. Moreover, four degradation pathways of MC-LR were analyzed, and the final products were CO and HO. Therefore, this S-nZVI-BC/PSSA system showed great promise for practical applications in the removal of and MC-LR.

105. 题目: Evaluating the role of carbon sources on the development of algal-bacterial granular sludge: From sludge characteristics, extracellular polymer properties, quorum sensing, and microbial communities
文章编号: N24041112
期刊: Journal of Cleaner Production
作者: Zhe Liu, Yudie Duan, Yiwen Hou, Shumin Zhang, Jiaxuan Wang, Min Gao, Aining Zhang, Yongjun Liu
更新时间: 2024-04-11
摘要: This study investigated the effect of dissolved organic matter (DOM) and particulate organic matter (POM) on the formation process of algal-bacterial granular sludge (ABGS). The results showed that compared with DOM, POM accelerated biomass growth and improved the settling performance of the sludge. However, concerning pollutant removal, ABGS cultured with DOM exhibited high TN and TP removal efficiency. The analysis of extracellular polymeric substances (EPS), indicated that the presence of POM primarily facilitated the production of loosely bound EPS (LB-EPS), whereas the presence of DOM promoted the secretion of tightly bound EPS (TB-EPS). Notably, carbon sources influenced the secretion of different signal molecules. ABGS cultured with POM exhibited higher concentrations of 3-oxo-C-HSL than that cultivated with DOM, while DOM resulted in the production of more C-HSL and C-HSL. Microbial communities analysis revealed that the dominant bacteria in the mature ABGS cultured with different carbon sources were , while the predominant algal genus displayed notable diversity. Further investigations into functional genes suggested that the nitrification process () and the denitrification process (, ) were greatly enhanced in the presence of DOM. This study reveals the mechanism of carbon source types and ABGS formation, providing valuable guidance for the treatment of municipal wastewater with high POM proportion.

106. 题目: Seasonal and Spatial Fluctuations of Reactive Oxygen Species in Riparian Soils and Their Contributions on Organic Carbon Mineralization
文章编号: N24041111
期刊: Environmental Science & Technology
作者: Fuhao Liu, Zhiqiang Wang, Jing Liu, Junaid Latif, Jianjun Qin, Huiqiang Yang, Wenjun Jiang, Yongxi Deng, Kangjie Yang, Zheng Ni, Yuanyuan Ding, Jia Xie, Yanhua Wang, Hanzhong Jia
更新时间: 2024-04-11
摘要: Reactive oxygen species (ROS) are ubiquitous in the natural environment and play a pivotal role in biogeochemical processes. However, the spatiotemporal distribution and production mechanisms of ROS in riparian soil remain unknown. Herein, we performed uninterrupted monitoring to investigate the variation of ROS at different soil sites of the Weihe River riparian zone throughout the year. Fluorescence imaging and quantitative analysis clearly showed the production and spatiotemporal variation of ROS in riparian soils. The concentration of superoxide (O2•–) was 300% higher in summer and autumn compared to that in other seasons, while the highest concentrations of 539.7 and 20.12 μmol kg–1 were observed in winter for hydrogen peroxide (H2O2) and hydroxyl radicals (OH), respectively. Spatially, ROS production in riparian soils gradually decreased along with the stream. The results of the structural equation and random forest model indicated that meteorological conditions and soil physicochemical properties were primary drivers mediating the seasonal and spatial variations in ROS production, respectively. The generated OH significantly induced the abiotic mineralization of organic carbon, contributing to 17.5–26.4% of CO2 efflux. The obtained information highlighted riparian zones as pervasive yet previously underestimated hotspots for ROS production, which may have non-negligible implications for carbon turnover and other elemental cycles in riparian soils.

107. 题目: Soil organic carbon dynamics under different land use systems in dry temperate ecosystem of north-western Himalayas
文章编号: N24041110
期刊: Catena
作者: Jatin Kumar, D R Bhardwaj, C L Thakur, Prashant Sharma, Pravidhi Sharma
更新时间: 2024-04-11
摘要: Globally, land use management consistently changes the dynamics of labile and recalcitrant (non-labile) soil organic carbon (SOC) fractions. However, the effects vary depending on altitude, soils and management practices. The dry temperate north-western Himalayan region is characterized by the presence of diverse land use systems, however the comparison of these SOC fractions across various land use regimes is not well-documented in the area. This study reported the differences in labile and non-labile SOC fractions under the major land-use systems viz., Agriculture (A), Horticulture (H), Agri-horticulture (AH) and Grass fallow (OF) land in various soil-depth classes (0–20, 20–40 and 40–60 cm) along three altitudinal ranges i.e., 2200–2500, 2500–2800 and 2800–3100 m above mean sea level (m. a.m.s.l.) across the dry temperate region of north-western Himalayas. The lability index and carbon management index of the soils were determined using these fractions. The analysis affirmed the highest accumulation of active fractions viz., very-labile (2.66 mg g), and labile C fraction (2.55 mg g) under AH, while the highest recalcitrant fractions i.e., less-labile (3.34 mg g) and non-labile C fraction (7.46 mg g) was documented under H. Moreover, the Carbon Management Index (CMI) followed the order of AH > A > H > OF. All the SOC fractions, pools and CMI significantly increased with increase in altitude but declined at lower soil depths. The Pearson correlation analysis revealed that the CMI was positively correlated with the active C fractions i.e. C frac 1 () and C frac 2 (). The higher active carbon pool and CMI (6.9–16 % and 4.1–15.7 % higher, respectively) under the AH may be due to the greater organic matter inputs to the soil under the agri-horticulture land use system. The findings of this study suggest that the soil can be managed sustainably by the adoption of stable land use systems such as agri-horticulture (owing to their higher CMI values) in the highly fragile dry temperate ecosystem of the north-western Himalayas.

108. 题目: Orange peel biochar/clay/titania composites: low cost, high performance, and easy-to-reuse photocatalysts for the degradation of tetracycline in water
文章编号: N24041109
期刊: Environmental Science: Water Research & Technology
作者: MORENIKE OLUWABUNMI ADESINA, Moses Alfred, Harald Seitz, Katlen Brennenstuhl, Harshadrai M Rawel, Pablo Wessig, Jiyong Kim, Armin Wedel, Wouter Willem Adriaan Koopman, , Emmanuel Unuabonah, Andreas Taubert
更新时间: 2024-04-11
摘要: New orange peel biochar/clay/titania nanocomposites (NCs) were studied for photocatalytic tetracycline (TET) degradation under both UV and natural solar irradiation by variation of NC dose, initial TET concentration, ionic strength, and competing anions. Total organic carbon (TOC) reduction was used to assess mineralization. Intermediate product formation during TET degradation were characterized using liquid chromatography-mass spectrometry and agar-based diffusion assays. The as-synthesized material prepared with biochar obtained at 600 ⁰C (C600KT) exhibits the best TET degradation performance under UV light exposure and solar irradiation with up to 92 and 89 % after 2 h, respectively. Especially under UV exposure, C600KT exhibits the highest apparent rate constant of 2.9*10-2 min-1 and half-life of 23.9 min. About 60 and 50 % TOC is removed after 2 h under UV and solar irradiation, respectively. Quenching experiments confirm that superoxide and hydroxyl radicals are the major reactive species involved in the degradation process. Furthermore, the treated effluents are harmless to both Escherichia coli and Staphylococcus xylosus, indicating that no intermediate products with higher toxicity are produced during the photocatalytic degradation. Additionally, the results show that the main fraction of TET is degraded within the first 15 min of irradiation. The C600KT composite is recyclable and retains its performance over at least four cycles, proving its stability and reusability. Overall, the new NCs are therefore highly attractive for the remediation of TET pollution in water.

109. 题目: Sphagnan in Sphagnum-dominated peatlands: bioavailability and effects on organic matter stabilization
文章编号: N24041108
期刊: Biogeochemistry
作者: Lauren Bryan, Rachel Shaw, Erik Schoonover, Alexis Koehl, Suzanne DeVries-Zimmerman, Michael Philben
更新时间: 2024-04-11
摘要:

The unique pectin-like carbohydrate “sphagnan” has been shown to protect organic matter from microbial decomposition in Sphagnum-dominated peatlands. However, the bioavailability of sphagnan has not been evaluated, and it is not known if it persists or continues to affect decomposition processes over the long timescales of peat formation. To address this, we assessed the connection between sphagnan content and organic matter decomposition rates in a temperate peatland near Fennville, MI, USA. We compared the effects of sphagnan over two timescales: (1) a short-term litter incubation assay using mosses from different peatland microtopographies; and (2) oxic and anoxic incubation assays of peat collected from multiple depths within the peat profile, reflecting a natural long-term decomposition continuum. On both timescales, we hypothesized that higher sphagnan content would be associated with lower decomposition rates, and that sphagnan would be selectively preserved compared to bulk C and other carbohydrates. The litter decomposition experiment supported both hypotheses, as higher sphagnan content was associated with lower mass loss, and sphagnan content increased due to selective preservation. In the peat, we observed weak but significant correlations between the relative abundance of sphagnan (as a fraction of total non-cellulosic sugars) and both aerobic and anaerobic respiration rates. This relationship was stronger in cores collected from hollow microtopographies than those from hummocks. However, there was not a significant relationship between respiration rates and the total (C-normalized) sphagnan content. Sphagnan content increased with depth in the peat profile, indicating selective preservation compared to bulk C. Additionally, we observed the accumulation of non-cellulosic glucose in the deep peat, likely derived from microbial exopolysaccharides. Together, these results indicate that sphagnan persists in the catotelm and continues to contribute to the long-term stabilization of organic matter in Sphagnum-rich peatlands, although the weak relationship with respiration indicates that its influence is relatively minor.

110. 题目: Adsorption of sulfamethoxazole and lincomycin from single and binary aqueous systems using acid-modified biochar from activated sludge biomass
文章编号: N24041107
期刊: Journal of Environmental Management
作者: Shahab Minaei, Khaled Zoroufchi Benis, Kerry N McPhedran, Jafar Soltan
更新时间: 2024-04-11
摘要: The extensive use of pharmaceuticals has raised growing concerns regarding their presence in surface waters. High concentrations of sulfamethoxazole (SMX) and lincomycin (LIN), as commonly prescribed antibiotics, persist in various wastewaters and surface waters, posing risks to public health and the environment. Biochar derived from accessible biowaste, like activated sludge biomass, offers a sustainable and eco-friendly solution to mitigate antibiotic release into water systems. This study investigates the effectiveness of HPO-modified activated sludge-based biochar (PBC) synthesized through microwave (MW) heating for the adsorption of SMX and LIN antibiotics. The synthesis parameters of PBC were optimized using a central composite design considering MW power, time, and HPO concentration. Characterization results validate the efficacy of the synthesis process creating a specific surface area of 365 m/g, and well-developed porosity with abundant oxygen-containing functional groups. Batch and dynamic adsorption experiments were piloted to assess the adsorption performance of PBC in single and binary antibiotic systems. Results show that PBC exhibits a higher affinity for SMX rather than LIN, with maximum adsorption capacities of 45.6 mg/g and 26.6 mg/g, respectively. Based on kinetic studies chemisorption is suggested as the primary mechanism for SMX and LIN removal. Equilibrium studies show a strong agreement with the Redlich-Peterson isotherm, suggesting a composite adsorption mechanism with a greater probability of multilayer adsorption for both antibiotics. Hydrogen bonding and π-π electron sharing are suggested as the prevailing adsorption mechanisms of SMX and LIN on the modified biochar. Furthermore, a dynamic adsorption system was replicated using a fixed bed column setup, demonstrating effective removal of SMX and LIN from pure water and real wastewater samples using PBC-loaded hydrogel beads (PBC–B). These findings serve as crucial support for upcoming studies concerning the realistic application of sludge-based biochar in the removal of antibiotics from water systems.

111. 题目: Polyester microfiber impacts on coastal sediment organic matter consumption
文章编号: N24041106
期刊: Marine Pollution Bulletin
作者: Samantha M Ladewig, Thomas S Bianchi, Giovanni Coco, Eliana Ferretti, Rebecca V Gladstone-Gallagher, Jenny Hillman, Julie A Hope, Candida Savage, Stefano Schenone, Simon F Thrush
更新时间: 2024-04-11
摘要: As plastic pollution continues to accumulate at the seafloor, concerns around benthic ecosystem functionality heightens. This research demonstrates the systematic effects of polyester microfibers on seafloor organic matter consumption rates, an important benthic ecosystem function connected to multiple reactions and processes. We used a field-based assay to measure the loss of organic matter, both with and without polyester microfiber contamination. We identified sediment organic matter content, mud content, and mean grain size as the main drivers of organic matter consumption, however, polyester microfiber contamination decoupled ecosystem relationships and altered observed organic matter cycling dynamics. Organic matter consumption rates varied across horizontal and vertical spaces, highlighting that consumption and associated plastic effects are dependent on environmental heterogeneity at both small (within sites) and larger (between sites) scales. Our results emphasize the important role habitat heterogeneity plays in seafloor organic matter consumption and the associated effects of plastic pollution on ecosystem function.

112. 题目: Formation mechanisms and degradation methods of polycyclic aromatic hydrocarbons in biochar: A review
文章编号: N24041105
期刊: Journal of Environmental Management
作者: Canxu Yao, Bing Wang, Jian Zhang, Muhammad Faheem, Qianwei Feng, Masud Hassan, Xueyang Zhang, Xinqing Lee, Shengsen Wang
更新时间: 2024-04-11
摘要: Biochar has been widely used in soil amendment and environmental remediation. Polycyclic aromatic hydrocarbons (PAHs) could be produced in preparation of biochar, which may pose potential risks to the environment and human health. At present, most studies focus on the ecotoxicity potential of biochar, while there are few systematic reviews on the formation mechanisms and mitigation strategies of PAHs in biochar. Therefore, a systematical understanding of the distribution, formation mechanisms, risk assessment, and degradation approaches of PAHs in biochar is highly needed. In this paper, the distribution and content of the total and bioavailable PAHs in biochar are reviewed. Then the formation mechanisms, influencing factors, and potential risk assessment of PAHs in biochar are systematically explored. After that, the effective strategies to alleviate PAHs in biochar are summarized. Finally, suggestions and perspectives for future studies are proposed. This review provides a guide for reducing the formation of biochar-associated PAHs and their toxicity, which is beneficial for the development and large-scale safe use of environmentally friendly biochar.

113. 题目: Wet-dry cycling influences the formation of mineral-associated organic matter and its sensitivity to simulated root exudates
文章编号: N24041104
期刊: Geoderma
作者: Andrea Jilling, Noah W Sokol, Karen Morán-Rivera, A Stuart Grandy
更新时间: 2024-04-11
摘要: Mineral particles provide reactive sites for organic carbon (C) to bind in soil; this ‘mineral-associated organic matter’ (MAOM) may persist for centuries to millennia or cycle rapidly in minutes to days. The conditions and processes that influence short and long-term cycling of MAOM are poorly constrained. Soil moisture is one key control on organic matter cycling in soil, and projected shifts in moisture regimes towards more intense rainfall and prolonged drought under climate change may alter MAOM formation and cycling. Here, in a 3-week laboratory incubation study, we evaluated how two contrasting moisture regimes affected the formation and cycling of C-labeled MAOM from two mineralogically-distinct soil types. Repeated wet-dry cycling (between 3% and 60% of water-holding capacity) enhanced the formation of C-MAOM relative to constant moisture conditions. The two soil types differed in rates of MAOM formation and the sensitivity of newly-formed and pre-existing MAOM to subsequent priming in the presence of simulated exudates (glucose and/or oxalic acid). Wet-dry cycling enhanced the decomposition of newly-formed MAOM and it further accelerated the potential priming of pre-existing MAOM. Therefore, while repeated cycles between drought-like and “optimal” moisture conditions may promote the formation of MAOM, they may also undermine the stability of pre-existing MAOM and limit opportunities for new C inputs to enter more persistent forms.

114. 题目: Mn-modified bamboo biochar improves soil quality and immobilizes heavy metals in contaminated soils
文章编号: N24041103
期刊: Environmental Technology & Innovation
作者: Jinzhou Su, Zhaolai Guo, Mengyan Zhang, Yumei Xie, Rui Shi, Xianfeng Huang, Yunfei Tuo, Xiahong He, Ping Xiang
更新时间: 2024-04-11
摘要: Soil contamination by heavy metals is becoming increasingly serious and needs to be solved urgently. Modified biochar is an effective strategy to solve this problem, and previous studies have only focused on the remediation of single heavy metal contaminated soils through biochar. However, the effects of metal-modified bamboo biochar on soil improvement and the passivation of heavy metals are still unknown. In this study, the Mn-modified bamboo biochar was prepared and the effects of Mn-modified bamboo biochar on soil improvement and the passivation of heavy metals were investigated. The results showed that Mn-modified bamboo biochar can improve the physical and chemical properties of soil, and immobilize heavy metals (i.e., Pb, As, Cd, and Cu). After adding Mn-modified bamboo biochar, soil pH decreased by 0.08–0.70, organic matter content increased by 8.00–45.13%, and alkaline hydrolysis nitrogen content increased by 1.84–5.78%. The diethylene triamine penta-acetic acid (DTPA)-extractable Pb, As, Cd, and Cu decreased by 21.25–58.65%, 7.76–34.02%, 36.44–46.50%, and 3.13–35.21%, respectively, while the acid-extractable Pb, As, Cd, and Cu decreased by 27.81–43.31%, 23.91–26.01%, 17.56–50.60%, and 7.94–18.09% respectively. These results indicated that Mn-modified bamboo biochar can improve the physicochemical properties of the soil and effectively inactivate multi-heavy metals in contaminated soil, Mn-modified bamboo biochar is a potential alternative agent for the management of multi-heavy metal contaminated soils.

115. 题目: Effects of long-term sewage sludge addition to a calcareous soil on soil organic C fractions and soil functions
文章编号: N24041102
期刊: Geoderma
作者: A Simões-Mota, P Barré, F Baudin, R M Poch, E Bruni, R Anton, A Enrique, I Virto
更新时间: 2024-04-11
摘要: Soil organic matter (SOM) is a recognized carbon reservoir and paramount in soil functioning and agrosystems productivity. Different management strategies have been established to enhance SOM in arable soils, and one is the application of exogenous organic matter (EOM). Despite significant efforts in recent years, the consequences of EOM addition on increasing soil organic C (SOC) storage and stability in different pedoclimatic contexts remain incompletely understood. In this study, we evaluated the effect of long-term (28 y) sewage sludge (SS) addition to a calcareous soil supporting rainfed extensive crops in a Mediterranean sub-humid area in terms of SOC stabilization and distribution among functional fractions.

116. 题目: Assessing the improvement potentials of climate model partitioning and time-variant feature extraction for soil organic carbon prediction
文章编号: N24041101
期刊: Catena
作者: Yilin Bao, Xiangtian Meng, Huanjun Liu, Xianglei Meng, Mingming Xing, Dan Cao, Jiahua Zhang, Fengmei Yao
更新时间: 2024-04-11
摘要: The monitoring of soil organic carbon (SOC) content is of significance for the global carbon cycle and the sustainability of soil quality under climate change. SOC prediction based on multi-source remote sensing data has been integrated well into different local regression strategies and model algorithms. However, the application of mixing local regression strategies with high generalizability and extracting more advanced information from time-variant data are rare. Here, we propose a climate model partitioning strategy, compared to common local regression strategies (soil classification and spectral clustering), with the aim of improving the accuracy of regional SOC content prediction. In this study, 1248 topsoil samples were collected in Northeast China. Environmental covariates representing soil-forming elements of meteorology, organisms, terrain and parent materials factors were explored, and then different time-variant covariate pre-processing were performed, and form Dataset I (conventional mean values of covariates) and Dataset II (shapelet features extracted from covariates) according to the data type. Next, we explored the effectiveness of global regression and local regression strategies (soil classification and five scenarios of Shared Socio-economic Pathways (SSPs)-based ant colony optimization clustering) for SOC prediction with a convolutional neural network (CNN) model. The results demonstrated that the optimal SOC content prediction model with the SSP245 local regression strategy and Dataset II as input yielded the lowest root mean square error (RMSE) of 5.83 g kg, the highest coefficient of determination (R) and a ratio of performance to interquartile distance (RPIQ) of 0.73 and 1.99, respectively. Second, the order of SOC prediction accuracy among the different regression strategies was SSP245 > SSP119 > SSP370 > soil classification > SSP126 > SSP585 > global regression. Third, compared with Dataset I, the CNN model-based Dataset II had a 12 % increase in average R values, a 5.27 % decrease in RMSE, and a 4.27 % increase in RPIQ, which indicates that the shapelet feature extraction algorithm could better mine the information of time-variant variables in SOC content assessment. Finally, we identified that CNN could perform better in regions with low spatial heterogeneity. Our results suggest that the paradigm of “local regression + feature extraction” has great potential for SOC prediction and mapping, especially for larger scales.

117. 题目: Contrasting properties of soil organic matter fractions isolated by different physical separation methodologies
文章编号: N24041014
期刊: Geoderma
作者: S Leuthold, J M Lavallee, M L Haddix, M F Cotrufo
更新时间: 2024-04-10
摘要: Physical soil organic matter (SOM) fractions provide increased insight into the biogeochemical functioning of soils. Several fractionation methodologies have been developed to separate particulate (POM) from mineral-associated organic matter (MAOM) fractions either by particle size, particle density, or some combination of these two properties. The proliferation of approaches to separation has led to ambiguity regarding what these methodologically defined fractions should be understood to conceptually represent, hindering robust data synthesis analyses and model development. Here we attempt to identify chemical similarities and differences amongst POM and MAOM fractions separated by different physical approaches, with the aim of guiding fractionation choices for future research. We obtained soils from 11 farms across the United States with variable parent materials, textures, and pHs, and fractionated them using 4 methods. We tested two single-step methods: a size fractionation (53 µm cutoff) and a density separation (1.85 g cm cutoff), and two multi-step methods: a combined size and density separation after full dispersion, which isolates a third pool of organic matter associated with coarse, heavy particles (coarse heavy associated organic matter; CHAOM), and a combined method with delayed dispersion to separate the free POM from the occluded POM + CHAOM fraction. We analyzed all fractions for C and N concentrations, their isotopic composition, and for their chemical composition via mid-infrared spectroscopy. We found that MAOM fractions tended to be very homogenous in character regardless of fractionation schemes, while POM varied widely. In particular, to POM isolated by density floatation was distinct in both isotopic and spectroscopic signature compared to POM isolated by size fractionation alone. Indeed, our results indicated that POM isolated by size is a composite fraction of light POM and CHAOM, and does not map well onto a conceptual pool. We found the CHAOM fraction to be more similar to MAOM in terms of chemical and spectroscopic composition, indicating that one-step density separations may be the most effective means of isolating contrasting SOM pools in a time and cost-efficient matter. However, our analysis highlights that POM, CHAOM and MAOM exhibit distinct features, and the three fractions are worth separating via a combined size-density fractionation when possible.

118. 题目: A new method for high-precision estimation of soil organic matter using two-dimensional correlation spectroscopy—to support collaborative use of global open soil spectral libraries
文章编号: N24041013
期刊: Geoderma
作者: Ke Xia, Taixia Wu, Shiwen Zhang, Shudong Wang, Xintao Li, Qiang Shen, Tao Li
更新时间: 2024-04-10
摘要: Soil organic matter (SOM) plays a crucial role in controlling soil function and quality, mitigating greenhouse gas emissions, and improving the global carbon cycle. However, spectral analysis and scale effects have long been challenging issues in remote sensing estimation of SOM. The collaborative utilization of soil spectral libraries (SSL) provides a solution to scale effects, but the lack of effective spectral variables and the numerous protocols within SSL remain significant obstacles to implementing this technology. To address these issues, this study developed a new SOM estimation method using a local spectral library (470 samples) from the dry farming areas of China. In response to the difficulties in spectral analysis, the response mechanism of SOM in different spectral dimensions was analyzed. The impact of different mathematical transformations on the one-dimensional reflectance spectroscopy (ODRS) was analyzed, and the optimal mathematical transformation method (logarithmic first-order differential, (lg)') was identified. However, ODRS still faced difficulties in accurately estimating SOM due to signal overlap and low signal strength. Two-dimensional correlation spectroscopy (TDCS) enables comprehensive analysis of interactions between different wavelengths, highlighting hidden information. In this study, an improved TDCS was developed by combining (lgR)' and TDCS. The enhanced TDCS increased the sensitivity and resolution of the spectra, providing a platform for studying interactions between different functional groups in the soil. Several optimization algorithms were used to optimize the best models in different spectral dimensions. The TDCS-(lg)'-DSI-CARS model, which combines competitive adaptive reweighted sampling (CARS) with TDCS, obtained optimal parameters (, , and reaching 0.92, 1.51, and 5.75, respectively), achieving precise estimation of SOM. Using mathematical models, simulations were performed for different spectral equipment scenarios, demonstrating that the proposed model was adaptable to the majority of high-spectral devices available on the market, effectively addressing the SSL alignment issue. Finally, the proposed modeling strategy was replicated in different soil types within a large-scale area, achieving excellent estimation accuracy (both and exceeded 0.80 and 3, respectively). Thus, the integration of this research's modeling strategy with SSL effectively responds to the scale effects in SOM remote sensing estimation. Additionally, this study proposed a methodology for constructing the TDCS library, which offers a straightforward process and lower costs for the collaborative use of SSL. The research findings provide theoretical and methodological support for SOM remote sensing mapping, sensor development, and the collaborative utilization of remote sensing data with large-scale SSL.

119. 题目: Combining anaerobic digestion slurry and different biochars to develop a biochar-based slow-release NPK fertilizer
文章编号: N24041012
期刊: Science of the Total Environment
作者: Esteban Villada, Manuela Velasquez, Ana M Gómez, Juan D Correa, Juan F Saldarriaga, Julián E López, Andrea Tamayo
更新时间: 2024-04-10
摘要: In this research, we developed a biochar-based fertilizer using biogas slurry and biochar derived from lignocellulosic agro-residues. Biogas slurry was obtained through the anaerobic digestion of the organic fraction of municipal solid waste (fresh vegetable biomass and/or prepared food), while biochars were derived from residues from quinoa, maize, rice, and sugarcane. The biochar-based fertilizers were prepared using an impregnation process, where the biogas slurry was mixed with each of the raw biochars. Subsequently, we characterized the N, P and K concentrations of the obtained biochar-based fertilizers. Additionally, we analyzed their surface properties using SEM/EDS and FTIR and conducted a slow-release test on these biochar-based fertilizers to assess their capability to gradually release nutrients. Lastly, a bioassay using cucumber plants was conducted to determine the N, P, and K bioavailability. Our findings revealed a significant correlation (r > 0.67) between the atomic O/C ratio, H/C ratio, cation exchange capacity, surface area, and the base cations concentration with N, P, and/or K adsorption on biochar. These properties, in turn, were linked to the capability of the biochar-based fertilizer to release nutrients in a controlled manner. The biochar-based fertilizer derived from corn residues showed <15 % release of N, P and K at 24 h. Utilization of these biochar-based fertilizers had a positive impact on the mineral nutrition of cucumber plants, resulting in an average increase of 61 % in N, 32 % in P, and 19 % in K concentrations. Our results underscore the potential of biochar-based fertilizers in controlled nutrient release and enhanced plant nutrition. Integration of biochar and biogas slurry offers a promising and sustainable approach for NPK recovery and fertilizer production in agriculture. This study presents an innovative and sustainable approach combining the use of biochar for NPK recovery from biogas slurry and its use as a biochar-based fertilizer in agriculture.

120. 题目: Quantity and quality characteristics of DOM loss in sloping cropland under natural rainfall in Southwestern China
文章编号: N24041011
期刊: Catena
作者: Longlong An, Zicheng Zheng, Tingxuan Li, Shuqin He, Xizhou Zhang, Yongdong Wang, Huagang Huang, Haiying Yu, Daihua Ye
更新时间: 2024-04-10
摘要: Rainfall events lead to dissolved organic matter (DOM) loss in sloping cropland, resulting in a high risk of soil carbon emissions and water pollution. However, limited studies have concentrated on the quality of DOM during different loss pathways in sloping cropland. In this study, the characteristics of DOM loss were explored during different loss pathways (surface runoff, interflow (0–20 cm), interflow (20–40 cm), and sediment) under different slope gradients (10° and 15°), based on natural rainfall. The results showed that surface runoff was the primary carrier of DOM in the sloping cropland, occupying 33 %-43 % of the total loss flux. The slope gradient significantly increased the DOM loss flux of surface runoff and sediment ( < 0.05). Parallel factor analysis (PARAFAC) analyses indicated that four fluorescent components of DOM were detected in both the runoff and sediment. The humic-like components (C1 and C2) accounted for higher than 70 % of the DOM in surface runoff. The protein-like components (C3 and C4) tended to dominate the DOM in the sediment and accounted for 63.02 %-66.93 %. An increased slope gradient exacerbated hydrophobic carbon loss in runoff. The hydrophobicity and aromaticity of DOM in sediment were higher than those in surface runoff. The molecular weight and bioavailability of DOM in sediment were lower than those in surface runoff. The range of humification index (HIX) was 0.63–0.70, indicating a low degree of DOM humification in sloping cropland. Our study clarified the differences between DOM quantity and quality during different loss pathways, which can provide a theoretical foundation for the effective prevention and control of DOM loss and the sustainable agricultural development of sloping cropland.

 共 22981 条记录  本页 20 条  本页从 101-120 条  6/1150页  首页 上一页  1 2 3 4 5 6 7 8 9 10 11  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。