24年12月3日文献情报（20篇）

24年12月3日文献情报

1. 题目: Marine heatwaves and disease alter community metabolism and DOC fluxes on a widespread habitat-forming seagrass species (Zostera marina)

文章编号: N24120320
期刊: Science of the Total Environment
作者: Luis G Egea, Rocío Jiménez-Ramos, Mary K English, Fiona Tomas, Ryan S Mueller
更新时间: 2024-12-03
摘要: Climate change and disease are two major threats to maintaining healthy seagrass habitats. Seagrasses, and the ecosystems they support, play a critical ecological role in global carbon (C) cycles, providing key ecosystem services, such as blue carbon storage. Zostera marina (eelgrass), the most widespread seagrass species globally, is increasingly affected by warming and is also regularly infected by the endophytic pathogen Labyrinthula zosterae. Both stressors negatively impact plant physiology and population distributions, yet the effects of these stressors on C cycling, and particularly on C metabolism and dissolved organic carbon (DOC) fluxes in eelgrass, remain largely unexplored. Through a mesocosm experiment simulating a marine heatwave (MHW) followed by pathogen challenge with L. zosterae, it was observed that the simulated MHW initially decreased daily community DOC fluxes and Net Production Rates (NPR), while not changing Respiration Rates. DOC released into the water column at the end of the MHW also was less bioavailable than DOC from the control treatment. Importantly, community NPR recovered to control levels after the simulated MHW was over, demonstrating the community's resilience to warming. On the other hand, plants challenged with L. zosterae, which caused a significant decrease in aboveground biomass, exhibited significant decreases in DOC and NPR up to 20 days after the infection. These results have important implications in blue carbon processes, given that both stressors significantly impact the quantity and quality of DOC produced by Z. marina communities. These findings also highlight the differing levels of resilience of C cycling in this system by showing that the impacts of the simulated heat wave may be more transient when compared to the effects of disease.
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2. 题目: Revealing the Mobilization and Age of Estuarine Dissolved Organic Matter During Floods Using Radiocarbon and Molecular Fingerprints

文章编号: N24120319
期刊: Water Research
作者: Zhao Liang Chen, Yuanbi Yi, Ruanhong Cai, Zhe-Xuan Zhang, Wenzhao Liang, Wenjing Fu, Penghui Li, Kai Wang, Lixin Zhang, Kejun Dong, Si-Liang Li, Sheng Xu, Ding He
更新时间: 2024-12-03
摘要: Estuaries significantly affect the transport of dissolved organic matter (DOM) from land to ocean. While the transport and composition of estuarine DOM have been extensively studied, the direct link between DOM and its age remains unclear, limiting a comprehensive understanding of the dynamics and fate of estuarine DOM under severe conditions (e.g., floods). This study applied radiocarbon and ultrahigh-resolution mass spectrometry analysis to investigate the correlation between DOM molecules and carbon age of 102 samples collected from the Yangtze River Estuary during both non-flood and flood periods. The results showed that young estuarine DOM are characterized by low-molecular-weight, unsaturated molecules, while aged estuarine DOM are relatively saturated with high-molecular-weight molecules. Phosphorus and nitrogen-containing compounds were key to DOM aging, potentially increasing the lability of aged DOM. Floods significantly impact DOM by introducing more labile aged DOM and young terrestrial DOM. Furthermore, floods enhanced the flux of aged DOM transported to the East China Sea by approximately 1.4 times. Our findings contribute to the study of estuarine DOM and its response during severe floods. Additionally, incorporating carbon age evidence improves the understanding of terrigenous DOM and its fate in large river estuaries before it contributes to the ocean carbon reservoir.
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3. 题目: Characteristics of soil aggregate distribution and organic carbon mineralization in quinoa fields with different soil textures in the northern of the Yinshan Mountains in inner Mongolia

文章编号: N24120318
期刊: Frontiers in Environmental Science
作者: Shuning Lv, Ruixiang Liu, Zhanbin Guo, Shuyan Wang
更新时间: 2024-12-03
摘要: The sub-mountain plains area at the northern foothills of the Yinshan Mountains in Inner Mongolia is an important grain producing area in the cold and arid regions of China, but due to climatic and environmental factors, it has resulted in a fragile ecological environment, degradation of arable land, and serious soil erosion. Quinoa (Chenopodium quinoa Willd.) is a hardy, cold and saline tolerant crop with much higher protein content than other crops. Therefore, it has begun to be grown on a large scale in the region in recent years. In order to investigate the distribution characteristics of soil aggregates and organic carbon (SOC) in quinoa fields in ecologically fragile areas, four quinoa fields with different soil textures, namely, sandy soil, sandy loam, loamy soil and clay loam, were selected for this experiment, and the mass percentages of different soil aggregate particle sizes and the organic carbon content of each particle size were determined before and after quinoa planting, and the organic carbon mineralisation in soil aggregates of quinoa fields with different textures was analysed through indoor organic carbon mineralisation cultures. The dynamic characteristics were analysed. The results showed that the stability of soil aggregates was enhanced after planting quinoa, and the highest mass percentage of aggregates with >2 mm particle size was 27.95% in clay loam soil. Planting quinoa in loamy soil had the most obvious effect on promoting the formation of soil macroaggregates, while the organic carbon content increased the most. The organic carbon (SOC) content of soil aggregates of all grain sizes increased by 0.45–3.09 g kg^-1 compared to the pre-sowing period, with the fastest rate and greatest intensity of organic carbon mineralisation in aggregates of 2–0.25 mm grain size. The study showed that growing quinoa in loamy soils improves soil structure, slows down the rate of soil organic carbon mineralization, and increases soil carbon sequestration capacity.
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4. 题目: Soil organic and inorganic carbon interactions under tillage and cover cropping determine potential for carbon accumulation in temperate, calcareous soils

文章编号: N24120317
期刊: Soil and Tillage Research
作者: K R Ball, Y Guo, P D Hallett, P Smith, H Moreno-Ramón, N L Morris, A A Malik
更新时间: 2024-12-03
摘要: The global soil carbon pool comprises soil organic carbon (SOC), found in almost all soils, and soil inorganic carbon (SIC), in calcareous soils. Despite their agricultural significance, calcareous soils, which exhibit diverse chemical properties and are found in varied environments, have historically been understudied. Using soils obtained from a decade-long, fully factorial field experiment located on temperate, near neutral pH, calcareous soils, this study examined the influence of cover crops (no-cover vs radish) and three levels of tillage intensity: shallow (10 cm) and deep (20 cm) non-inversion, and plough (25 cm inversion) on SOC and SIC stocks. Further, considering recent experimental and observational evidence indicating the interactions of SOC and SIC pools and their likely microbial control, we also investigated how SOC, the soil microbial biomass pool, and SIC are correlated. For SOC stock, there were significant interactions with total SIC and SOC:SIC ratio that differed by tillage intensity. Across the whole soil profile (0–60 cm), there was a significantly positive relationship between SOC content and SIC stock that was only present with ploughing. Further, at low SOC:SIC ratios (∼0.5–3.0), while SOC stock was marginally lower under plough, at higher SOC:SIC ratios (∼3.1–10.0), SOC stock was predicted to be up to ∼4–fold greater (4 kg m⁻²) with ploughing than the lower intensity tillage treatments. This result highlights a critical SOC-SIC interaction that, depending on tillage intensity, may offset anticipated disturbance-related loss of SOC, and challenges the common perception that tillage consistently reduces SOC. SOC stock was also ∼40 % (0.42 kg m⁻²) greater at 0–10 cm and ∼30 % (0.2 kg m⁻²) greater at 30–40 cm under radish cover crop than without. SIC stock differences were correlated with SOC content, tillage intensity and cover cropping. SIC stock was strongly correlated with SOC, with a predicted ∼0.3–1 kg m⁻² increase in SIC stock for ∼1 % increase in SOC. Under radish cover crops and with ploughing, there was ∼0.7 kg m⁻² more SIC than under all other conditions. Microbial biomass was positively correlated with SIC stock suggesting a causality that needs experimental testing. Given that reduced tillage is a frequently recommended practice to increase soil carbon storage and given the limited attention that has been paid to the influence of cover cropping on the SIC pool, our results indicate the need for further investigation around the dynamics of SOC and SIC interactions and stabilization processes in calcareous soils and highlights the pitfalls of a one-size-fits-all approach to soil carbon management.
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5. 题目: Metabolomic insights into rhizosphere soil carbon component variations of Phragmites communis in the exposure of propranolol

文章编号: N24120316
期刊: Science of the Total Environment
作者: Shuai Jin, Jingjing Fu, Jin Qian, Bianhe Lu, Yin Liu, Sijing Tang, Junwei Shen, Yitong Yan, Shasha Zhao
更新时间: 2024-12-03
摘要: Propranolol (PRO) has been detected in water bodies worldwide, attributed to the incomplete removal by wastewater treatment processes. Although reports exist on the removal of PRO by wetland plants such as Phragmites communis, research on the impact of PRO on soil organic carbon (SOC) components in these plants' rhizospheres remains scarce. This investigation examined the impacts of 0.5 μg/L and 50 μg/L concentrations of PRO on the rhizosphere of P. communis over a 21-day laboratory experiment. PRO exposure slightly promoted root growth, notably enhancing fine root development at a lower concentration. A notable decrease in SOC content was observed in the PRO-treated samples: specifically, the proportion of mineral-associated organic carbon (MAOC) rose (from 47.90 % to 33.17 %), whereas the proportion of particulate organic carbon (POC) significantly declined following PRO treatment (from 52.10 % to 66.83 %). Moreover, Proteobacteria and Nitrospirae experienced significant promotion in the high-concentration samples while Bacteroidetes and Verrucomicrobia were inhibited. The metabolomic analysis demonstrated that glycine, serine, and threonine metabolism was the principal differential metabolic pathway in varying concentrations of PRO exposure. Additionally, across varying PRO concentrations, plant influence emerged as the predominant factor affecting POC alterations, whereas MAOC changes resulted from the synergistic interaction of plants and associated bacteria. The outcomes of this study mark a critical advancement towards a thorough assessment of PRO's impact on the rhizosphere of wetland plants, bearing significant ramifications for evaluating PRO's environmental effects.
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6. 题目: Magnetic biochar generated from oil-mill wastewater by microwave-assisted hydrothermal treatment for sonocatalytic antibiotic degradation

文章编号: N24120315
期刊: Journal of Environmental Chemical Engineering
作者: Pengyun Liu, Zhilin Wu, Maela Manzoli, Giancarlo Cravotto
更新时间: 2024-12-03
摘要: The pollution risks of biomass-containing and antibiotics-containing wastewater mean that it must be treated before discharge into the environment. In a process following circular economy principles, oil-mill wastewater (OMWW) was treated in a microwave-assisted hydrothermal process and with simultaneously fabricated magnetic biochar (MBC), which was used as a catalyst for the sonocatalytic degradation of antibiotics metronidazole (MET) and ciprofloxacin (CIP) in aqueous solutions. FeCl₃·6H₂O, FeCl₂·4H₂O, and KOH were added to the OMWW, which was then treated in a SynthWave microwave reactor under either a nitrogen or air atmosphere. The UV₂₅₄ and COD removal efficiencies of the OMWW reached 42.3% and 60.6%, respectively, after treatment at 250 ℃ for 3 h. The MBC obtained from the OMWW treatment with air exhibited the highest adsorption and catalytic activity for antibiotics degradation. The synergistic effects of combining adsorption and sonolytic removal were in the ranges of 0.76-3.07 (MET) and 0.75-3.17 (CIP), resulting in significant degradation rate constants of pseudo-first-order kinetics (k₁) that ranged from 0.010 to 0.086 min^-1 (MET) and from 0.018 to 0.050 min^-1 (CIP). Hydrophobic MET underwent faster degradation than hydrophilic CIP. The ^•OH is crucial for removing the model antibiotics. Initial antibiotics concentration, reaction volume, ultrasonic frequency, and power had clearer impacts on antibiotics degradation than bulk temperature. Furthermore, the possible sonocatalytic degradation pathways have also been proposed herein. The absorbents and catalysts were derived during the purification of OMWW and subsequently used for antibiotics removal from water, becoming an innovative case of circular economy and sustainable waste treatment.
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7. 题目: Induced electro-Fenton triggers trace iron utilization for simultaneous organic phosphorous degradation and phosphate recovery

文章编号: N24120314
期刊: Chemical Engineering Journal
作者: Ning Deng, Jie Hu, Lejiaqi Zhang, Congcong Ni, Qi Zhang, Xin Huang
更新时间: 2024-12-03
摘要: Phosphorus recovery from wastewater has the potential to alleviate both phosphorus scarcity and water pollution. Unlike mineral orthophosphate, organic phosphorus (OP) recovery typically requires multiple steps: oxidation to orthophosphate followed by separation. Electro-Fenton can synchronize these steps in a unified reactor. However, conventional anodic-Fenton (AF) that relies on the direct sacrificial Fe anode, often generates excessive iron sludge. This not only undermines the oxidative capacity but also changes the optimal pH conditions. Herein, we addressed these challenges by developing an induced electro-Fenton (I-EF) system that significantly reduces iron sludge by 94.0 %. The degradation of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC, 5.0 mg P/L) in I-EF reached 76.7 % in 60 min, which is much higher than that (46.0 %) in the conventional AF system. Following PBTC degradation to form PO₄^3-, the I-EF system achieved 88 % PO₄^3- recovery through adsorption onto iron hydroxides. The exceptional performance in simultaneous PBTC degradation and recovery can be attributed to multiple functions of minimal iron utilization in the I-EF system. First, trace iron release can prevent quenching of hydroxyl radicals (·OH) by excessive Fe²⁺. Second, the absence of strong iron hydrolysis can maintain a stable pH condition (3.0–3.2) for Fenton reaction and avoid PBTC removal through direct coagulation process. The feasibility of I-EF was also successfully demonstrated for other OP forms containing C-P and C-O-P bonds. The degradation efficiency of various OPs was closely related to their bond energy and complexation capacity with iron hydroxides. This study makes use of the I-EF system to innovatively accomplish the degradation of organic phosphorous and simultaneous phosphate recovery.
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8. 题目: Novel cationic and amphoteric starch-modified coagulants for efficient treatment of relatively high turbidity and large organic matter source waters: Performance, predictive modeling and mechanism analysis

文章编号: N24120313
期刊: Separation and Purification Technology
作者: Yunxuan Chen, Jun Nan, Mingqi Guo, Yibo Zhang, Jinghui Wang, Qi Wang, Rui Fang
更新时间: 2024-12-03
摘要: Finding alternative solutions of water source containing short-term relative high turbidity and large organic content is a pressing need in view of the inherent limitations of traditional inorganic coagulants. Requirement of significant dosage increase for conventional iron and aluminum salt coagulants can create several challenges including dose adjustment, suboptimal performance and high concentration of residual metal ions. In this study, acrylamide monomer (AM) and methacryloyloxyethyltrimethylammonium chloride (DMC) were grafted onto starch and carboxymethyl starch to obtain novel cationic and amphoteric starch-modified coagulants. Concurrently, the obtained coagulants were comprehensively evaluated under varying simulated water quality conditions to analyze their turbidity and organic matter removal efficiencies. Polymerized aluminium chloride (PACl) was used as the reference coagulant to evaluate the roles of polymer charge density, total charge, and molecular chain length in the coagulation mechanism for further illustration of their efficacy. In comparison to the traditional coagulant PACl, the modified coagulant was found to be more effective in enhancing flocculation and aggregation behavior, lowering of energy barriers, and enhancing adsorption energy by using the Density Functional Theory (DFT) calculations and Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory based investigation of the mechanism. Moreover, these behaviors were mainly attributed to significant exchange of charge density between coagulant and the pollutants. Additionally, in order to facilitate accurate and efficient treatment of water having diverse qualities, quadratic polynomial equation based mathematical model was constructed for quantitative analysis and model prediction. Findings of this study point towards an effective and precise approach to coagulation technology and thereby enabling sustainable and efficient purification of turbid source water containing large organic matter.
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9. 题目: CO2-Enhanced Cadmium Removal by MgO-loaded Biochar: A Precipitation-Dominated Mechanism

文章编号: N24120312
期刊: Journal of Environmental Chemical Engineering
作者: Hongru Shang, Yinxue Li, Stephen Johnson Khamis Yesto, Olga Sanginova, Yujie Feng, Yanling Xu, Yanling Yu
更新时间: 2024-12-03
摘要: Loading MgO onto biochar was considered an effective method to improve cadmium adsorption capacity by upgrading the ion exchange and precipitate abilities. In this study, MgO-loaded corncob-residue biochar (MBC) prepared with the impregnation method exhibited a maximum Cd(II) capacity of 438.7 mg·g⁻¹, demonstrating its potential for efficient cadmium removal. The adsorption kinetics fitted intraparticle diffusion model (c_0,Cd ≤ 300 mg·L⁻¹, R²≥0.9806) and pseudo-second-order model (c_0,Cd > 300 mg·L⁻¹, R²≥0.9826), respectively. Meanwhile, the Temkin isotherm model (R²=0.9849) could better describe the adsorption. Isolating CO₂ from the air could decelerate the Cd(II) adsorption and cause the removal of Cd(II) to be delayed to the release of Mg²⁺ and OH^-, thus confirming that the effect of ion exchange was insignificant. Therefore, the dominant position of precipitation in the adsorption mechanism was revealed, and CO₂ played a crucial role in accelerating the process by reducing the required pH value. The negative effect of pH value and co-existing ions was mainly due to the impeding on the precipitate process. As a supporter, biochar could increase the adsorption efficiency of MgO by reducing the adverse impact of precipitate. These findings highlight the importance of considering CO₂ in designing and optimising biochar-based cadmium removal systems.
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10. 题目: Pyrolytic conversion of cattle manure and acid mine drainage sludge into biochar for oxidative and adsorptive removal of the antibiotic nitrofurantoin

文章编号: N24120311
期刊: Environmental Research
作者: Kwangsuk Yoon, Heuiyun Lee, Gihoon Kwon, Hocheol Song
更新时间: 2024-12-03
摘要: Antibiotics in aquatic environments can foster the development of antibiotic-resistant bacteria, posing significant risks to both living organisms and ecosystems. This study explored the thermo-chemical conversion of cattle manure (CM) into biochar and assessed its potential as an environmental medium for removing nitrofurantoin (NFT) from water. The biochar was produced through the co-pyrolysis of CM and acid mine drainage sludge (AMDS) in a N2 condition. The gaseous and liquid products generated during pyrolysis were quantified and characterized. The biochar exhibited both catalytic and adsorptive capability in NFT removal. It effectively activated persulfate to drive oxidative degradation of NFT via radical (SO4^•- and •OH) and non-radical (¹O2) pathways. NFT adsorption on the biochar involved multiple binding mechanisms, including electrostatic, hydrogen bonds, and π-π EDA interactions, as evidenced by XPS analysis before and after the reaction. Furthermore, the biochar's performance stability was demonstrated through five cycles of reuse and leaching tests. These findings present a viable approach to generate energy from waste by co-pyrolyzing of livestock manure and metal-containing industrial waste, while also producing environmental media capable of removing antibiotics from wastewater through diverse mechanisms.
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11. 题目: Integration of GIS with RUSLE to estimate soil, organic matter and nutrient loss from a watershed of eastern Himalayan Terai

文章编号: N24120310
期刊: Environmental Earth Sciences
作者: Uddipta Narayan Hazra, Amarjeet Mahato, Shovik Deb, Somsubhra Chakraborty, Debajit Datta, Priyabrata Santra, Partha Sarathi Patra, Ashok Choudhury
更新时间: 2024-12-03
摘要:

Soil erosion is a major issue in the Indian Himalayan region, affecting both mountainous areas and the Terai. In the Terai, significant surface soil loss is driven by factors such as sandy soils, shallow soil depth, high rainfall, and the erosive force of young rivers. Human activities, including the conversion of forests and grasslands to croplands and settlements, along with poor agricultural practices, exacerbate the problem. This pilot-scale study aimed to quantify surface soil erosion and the loss of soil organic matter and nutrients in a watershed of the eastern Himalayan Terai region of India, utilizing the Revised Universal Soil Loss Equation (RUSLE) model on a Geographic Information System (GIS) platform. The results revealed substantial soil loss ((overline{x }) = 32.0 Mg ha⁻¹ yr⁻¹), along with the removal of organic matter ((overline{x }) = 0.95 Mg ha⁻¹ yr⁻¹), available nitrogen ((overline{x }) = 1.49 kg ha⁻¹ yr⁻¹), available phosphorus (P₂O₅) ((overline{x }) = 0.50 kg ha⁻¹ yr⁻¹), and available potassium (K₂O) ((overline{x }) = 5.02 kg ha⁻¹ yr⁻¹). Ground surveys indicated that a significant portion of the local population was directly or indirectly affected by the annual loss of fertile topsoil, with farmers, agricultural workers, and tea garden owners being the most impacted. The erosion problem of Terai region remains unheard of as it does not cause direct damage like landslides. However, loss of topsoil every year declines the land productivity and curbs the agricultural financial benefit margin. The study recommends expanding soil erosion monitoring and modelling across the entire eastern Himalayan Terai region. Being a cost and time friendly reliable method, use of RUSLE on the GIS platform can be the best option for that. With updated erosion data, comprehensive management measures can be developed involving policymakers, administrators, researchers, and local communities.

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12. 题目: Iron’s role in soil organic carbon (de)stabilization in mangroves under land use change

文章编号: N24120309
期刊: Nature Communications
作者: Francisco Ruiz, Angelo Fraga Bernardino, Hermano Melo Queiroz, Xosé Luis Otero, Cornelia Rumpel, Tiago Osório Ferreira
更新时间: 2024-12-03
摘要:

Mangroves are coastal hotspots for carbon storage and yet face multiple threats from anthropogenic activities. Here we explore the role of iron-mediated organomineral interactions (FeOMIs) in soil organic carbon (SOC) stabilization and their sensitivity to land use change (LUC) in Amazonian mangroves. We show that Fe oxides protect more labile SOC fractions, which would otherwise be vulnerable to biological degradation, with poorly crystalline Fe oxides being the most effective phase for SOC retention. Despite the fragile equilibrium of FeOMI under dynamic redox conditions in mangroves, this balance sustains approximately 8% of total SOC. The studied LUC scenario led to massive loss of FeOMIs as less crystalline phases were either degraded or transformed into more crystalline ones, losing the efficiency in retaining SOC. The conversion of mangroves to pastures and shrimp ponds, which are pervasive globally, triggers important biogeochemical changes, with major implications for the carbon sequestration potential of mangrove soils.

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13. 题目: Biochar effects on aggregation and carbon-nitrogen retention in different-sized aggregates of clay and loam soils: A meta-analysis

文章编号: N24120308
期刊: Soil and Tillage Research
作者: Xiaomai Yuan, Guichen Ban, Yibao Luo, Jinrong Wang, Dingjiao Peng, Run Liang, Tieguang He, Ziting Wang
更新时间: 2024-12-03
摘要: Biochar offers environmental benefits, such as enhanced soil aggregation and carbon sequestration. However, its effect on soil aggregation and organic carbon and nitrogen sequestration across soil textures remains unclear. In this systematic review, the results of 534 experiments reported in 100 peer-reviewed articles were analyzed. The results show that biochar addition enhances macroaggregate formation, improves aggregate water stability, and enriches organic carbon and nitrogen in different-sized aggregates compared with un-amended controls. When comparing clay and loam soils to biochar, clay soils respond more effectively to biochar than did loam soils. Specifically, the size distribution of clay aggregates responded to biochar input, whereas the organic carbon within different-sized aggregates of loam soil significantly increased. The benefits of biochar are attributed to the reduction in clay bulk density (−10.9 %) and the increase in microbial biomass carbon (+32.4 %), as well as enhanced organic matter input from plant biomass (+28.3 %) in loam. Long-term experiments (> 3 yr) revealed more macroaggregate-associated organic carbon in both loam and clay soils. Based on the results of this assessment, the optimal application conditions of biochar in loam and clay soils are as follows: in loam soils with initial organic carbon levels of 5–10 g·kg⁻¹, biochar should be applied at a rate of 10–20 t·ha⁻¹ to maximize large macroaggregate formation; in clay soils, an application rate of 20–40 t·ha⁻¹ of biochar is recommended. Overall, biochar improves aggregate stability and carbon and nitrogen contents, with distinct responses in clay and loam soils.
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14. 题目: Artificial humic acid improves P availability via regulating P-cycling microbial communities for crop growth

文章编号: N24120307
期刊: Plant and Soil
作者: Yue Yuan, Fan Yang, Zhuqing Liu, Kui Cheng
更新时间: 2024-12-03
摘要:

Background and aims

A-HA (artificial humic acid) play essential roles to improve soil organic matter in agricultural soil, however, the relative mechanistic effects on soil phosphorus (P) transformation and availability resulting from stimulation of microbial activities and changes in microbial communities remain uncertain. This study investigated the responses of microbial communities in the rhizosphere, bulk soils, and unplanted soil with the combined application of A-HA and phosphate fertilizer to better understand the mechanisms by which A-HA affects P cycling.

Methods

Physical and chemical analyses, along with metagenomic methods, were employed to determine phosphorus availability and fractions, as well as to measure soil microbial diversity and the relative abundance of microbial P-cycling genes in bulk soil, rhizosphere soil, and unplanted soil subjected to varying levels of phosphorus fertilizer.

Results

The findings demonstrated that application of A-HA and phosphate fertilizers directly increased soil Olsen P and unstable P levels and indirectly altered microorganism functional genes involved in soil P cycling. More interestingly, 28 macrogenomic assembled genomes (MAGs) were reconstructed, all of which contained P cycle-related genes with copy numbers ranging from 1 to 8. In addition, we evaluated the correlation among maize biomass, photosynthetic characteristics, plant P uptake, and P utilization efficiency (PUE) and stabilized soil P fractions. A-HA + P0.5 treatment appeared the most promising due to its higher sustainability yield index and agronomic efficiency.

Conclusions

Our results highlight the importance of A-HA in promoting changes in microbial functional genes involved in soil P cycling with different P levels.

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15. 题目: Thermal sensitivity of soil organic carbon decomposition in riparian ecosystems

文章编号: N24120306
期刊: Plant and Soil
作者: Zhuolin Yu, Amit Kumar, Shuai Zhang, Zhi-Guo Yu, Shengdao Shan, Biao Zhu, Junjie Lin
更新时间: 2024-12-03
摘要:

Aims

The soils of riparian ecosystems harbor a significant amount of organic carbon (C) and are susceptible to anthropogenic disturbances. However, the warming response of soil organic carbon (SOC) decomposition in riparian ecosystems has received limited attention.

Methods

In this study, we quantified the thermal sensitivity (Q₁₀) of SOC decomposition across a mean annual precipitation (MAP) gradient ranging from 1270 to 1416 mm in the riparian zones of the Three Gorges Reservoir.

Results

Our findings indicate that the Q₁₀ ranged from 1.1 to 2.1. Notably, MAP exerts a negative effect on Q₁₀ by positively affecting the decomposability of SOC (D_SOC) and soil pH, collectively explaining 52.5% of the variation in Q₁₀. Among the factors studied, D_SOC emerged as the most critical determinant of Q₁₀ variation. The observed negative correlation between D_SOC and Q₁₀ suggests that stable SOC is more susceptible to loss under warming compared to active SOC.

Conclusions

Consequently, MAP-driven changes in D_SOC significantly influence the soil C cycle feedback to climate warming in riparian zone ecosystems. Specifically, locations with greater MAP are likely to experience stronger positive feedback from SOC loss in response to warming.

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16. 题目: Enhanced phosphorus bioavailability of biochar derived from sewage sludge co-pyrolyzed with K, Ca-rich biomass ash

文章编号: N24120305
期刊: Water Research
作者: Xiao Guo, Sha Liang, Zhengkang Zou, Xiaoxiao Xu, Fan Yang, Junda Quan, Xingwu Li, Huabo Duan, Wenbo Yu, Jiakuan Yang
更新时间: 2024-12-03
摘要: Sewage sludge has great potential for phosphorus (P) recovery. However, sewage sludge-derived biochar suffers from low P bioavailability in land application. K, Ca-rich biomass ash was used to co-pyrolyze with sewage sludge to enhance P bioavailability of synthesized biochar. Phase transformation mechanism of P during the co-pyrolysis process was studied. When sunflower straw ash (SSA) was used as an additive (50 wt%) for co-pyrolysis with sludge at 600°C, the ratio of bioavailable P (Bio-P, determined by 2 wt% citric acid) to total P (TP) of the co-pyrolyzed biochar could achieve 92.1 wt%, which was remarkably higher than that of biochar pyrolyzed by sludge alone (9.5 wt%). The K and Ca elements in SSA significantly contributed to the conversion of the Fe-phosphate phase (FePO₄) in sludge into K, Ca-phosphates (KCaPO₄, K₂CaP₂O₇ and K₂CaP₂O₇·4H₂O) and Ca-phosphate (Ca₅(PO₄)₃OH) phases, therefore enhancing the Bio-P content in the co-pyrolyzed biochar. Model compound pyrolysis results indicate that KCl/K₂CO₃ and CaCO₃ phases in SSA play a synergistic role in enhancing the P bioavailability of co-pyrolyzed biochar. Based on the DFT calculations, the absolute value of the adsorption energy (|ΔE_ads|) of CH₃COO^- presented an order: K₂CaP₂O₇ (2.43 eV) > KCaPO₄ (1.70 eV) > Ca₅(PO₄)₃OH (1.64 eV)> FePO₄ (1.08 eV), indicating that K₂CaP₂O₇, KCaPO₄, and Ca₅(PO₄)₃OH are more likely to interact with organic acid and have higher bioavailability than FePO₄. Furthermore, the co-pyrolyzed biochar reaches the release rate standard for P, K-slow-release fertilizer. This study proposes a promising and sustainable solution to simultaneously realize sludge utilization and P resource recycling.
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17. 题目: Low molecular weight organic acids stabilise siderite against oxidation and influence the composition of iron (oxyhydr)oxide oxidation products.

文章编号: N24120304
期刊: Environmental Science: Processes & Impacts
作者: Katherine A Rothwell, Laurel K ThomasArrigo, Ralf Kaegi, Ruben Kretzschmar
更新时间: 2024-12-03
摘要: Siderite (FeCO3) is an important reservoir of mineral-bound ferrous iron in non-sulfidic, reducing soils and sediments. It is redox sensitive, and its oxidation may facilitate the reduction of a range of pollutants, produce reactive oxygen species, or induce the formation of oxidation products with large surface areas for contaminant sorption. However, there is currently a limited understanding of the stability of siderite in complex environments such as soils and sediments. Here, we use a series of batch experiments complemented with thorough characterisation of mineral oxidation products to investigate the oxidation of siderite in the presence and absence of the low molecular weight organic acids (LMWOAs) citrate, tiron, salicylate, and EDTA as analogues for naturally occurring compounds or functional groups of natural organic matter that ubiquitously coexist with siderite. Our results show that siderite alone at pH 7.5 was completely oxidised to form ferrihydrite, nanocrystalline lepidocrocite, and nanocrystalline goethite in less than 6 hours. However, in the presence of LMWOAs, up to 48% of the siderite was preserved for more than 500 hours and the formation of goethite was inhibited in favour of ferrihydrite and lepidocrocite. Using experimental data from electron microscopy and chemical speciation modelling, we hypothesise that the siderite may be preserved through the formation of an Fe(III)-passivation layer at the siderite surface.
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18. 题目: Sources and distribution of organic matter and polycyclic aromatic hydrocarbons in sediments of the southwestern Portuguese shelf

文章编号: N24120303
期刊: Marine Pollution Bulletin
作者: Mário Mil-Homens, Sofia Gonçalves, Alejandro Cortés, Barend L van Drooge, Henko de Stigter, Joan O Grimalt, Lívia Gebara Cordeiro, Miguel M Santos, C Marisa R Almeida, Miguel Caetano
更新时间: 2024-12-03
摘要: Total organic carbon (Corg), total nitrogen (Ntot), Corg/Ntot, δ¹³Corg, δ¹⁵N, calcium carbonate (CaCO3), and grain size were analyzed in 70 surface samples and 19 short cores from the southwestern Portuguese shelf. Perylene and USEPA-16 PAHs were quantified in a subset of these samples. The findings suggest that organic matter derives from a mix of terrestrial and marine sources, outlined by Corg, Ntot, and isotopic signatures. Perylene combined with δ¹³Corg was used to identify the main PAH sources in these environments. Diagnostic perylene ratios revealed contributions from natural sources in the Tagus region and contaminated materials from the Sado Dredged Disposal Site, with additional perylene in Sines linked to atmospheric deposition of pyrogenic sources. A significant correlation between perylene and USEPA-16 PAHs indicates natural and anthropogenic inputs from the Tagus. This multiproxy approach—combining USEPA-16ΣPAHs, perylene, and δ¹³Corg—offers insights for assessing environmental risks and guiding marine environmental management according to the MSFD.
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19. 题目: Granular anaerobic membrane bioreactor coupled hybrid forward osmosis − membrane distillation module for organic matter, nutrient and bisphenol A removal: Integrated assessment of performance, cost, toxicity, and risks

文章编号: N24120302
期刊: Chemical Engineering Journal
作者: Carolina Rodrigues dos Santos, Guilherme Otávio Rosa e Silva, Ane Alice Dias Araújo, Thamiris Gualberto Serafim, Guilherme Pinheiro Drumond, Vera Lúcia dos Santos, Luyara de Almeida Fernandes, Juliana Calabria de Araújo, Gemima Santos Arcanjo, Lucilaine Valéria de Souza Santos, Míriam Cristina Santos Amaral
更新时间: 2024-12-03
摘要: Bisphenol A (BPA), a compound widely produced and used worldwide, has been increasingly investigated due to its potential risk to human health and the environment. Studies and regulations have focused on its presence in materials in contact with food and children’s products; however, BPA has been detected in several aquatic matrices, reaching water bodies, mainly due to its incomplete removal in wastewater treatment plants, which may lead to even greater hazards. Therefore, this study investigated for the first time a granular anaerobic membrane bioreactor associated with a hybrid module of forward osmosis – membrane distillation (G-AnOMBR/MD) focusing on removing BPA in domestic sewage. In addition, the removal of organic matter and nutrients was evaluated concomitantly at the ecotoxicological tests, risk assessment, and cost evaluation. The results showed that the average COD, P-PO₄³⁻, and N-NH₄⁺ removal was 95.6 %, 99.6 %, and 91 %, respectively. The removal of BPA was 94.65 % after 30 days of operation due to the granular sludge biodegradation and the higher selectivity of the FO-MD module. In addition, the system eliminated the high environmental and human health risks related to BPA, and the final effluent was non-toxic to the bacteria Aliivibrio fischeri. Finally, the estimated cost for G-AnOMBR/MD was US$ 3.91 m⁻³. Thus, the technology is promising for generating a high-quality and safe effluent regarding the presence of BPA and being financially competitive with other advanced systems.
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20. 题目: New insights into mechanism of enhancing biogas residue dewaterability using carbon quantum dots and biochar composites under visible light through electrochemical approach

文章编号: N24120301
期刊: Bioresource Technology
作者: Xue Yang, Wei Zhang, Yifan Yang, Jiaqin Liu, Bin Dong
更新时间: 2024-12-03
摘要: This study investigated the treatment of biogas residue using a catalytic activation system with carbon quantum dots/biochar (CQDs/BC) and H2O2, driven by visible light. Results indicated that the charge transfer resistance (Rct) of CQDs/BC was 74.5 % lower than that of CQDs, with improved charge separation rates and enhanced light absorption. In the CQDs/BC + H2O2 system, relative capillary suction time (CST/CST0) and water content of biogas residue cake (Wc) decreased by 56.6 % and 8.9 % compared to control groups, respectively. CQDs/BC generated photogenerated electrons (e⁻) and holes (h⁺) under visible light, converted oxygen species, including ·OH, ·${\mathrm{<span\; style="font-size:\; 15px;">O</span>}}_{\mathrm{<span\; style="font-size:\; 15px;">2</span>}}^{<span\; style="font-size:\; 15px;">-</span>}$, and ¹O2, and considerably improved the oxidizing capacity of the system. The Rct of the treated biogas residue was 62.2 % lower than that of the original biogas residue and showed a significant correlation with Wc (r = 1.0, p < 0.001). These findings underscored that biogas residue Rct can be used as an indicative parameter of its dewatering performance.
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