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81. 题目: Patterns of dissolved organic carbon (DOC) in drainage water at farm scale and impact of sediment mitigation measures on DOC concentrations
文章编号: N26090419
期刊: Journal of Soils and Sediments
作者: Maame Croffie, Owen Fenton, Demi Ryan, Russell Adams, Karen Daly
更新时间: 2026-09-04
摘要: Purpose Minimising nutrient loss in water and sediment along surface and near surface pathways on farms can be achieved through installation of mitigation measures such as sediment ponds or leaky dams. However, there is limited information on how these in-drain mitigation measures influence dissolved organic carbon (DOC) concentrations along the drainage network. The objective of this multi-farm study was to evaluate the impact of mitigation measures installed to control nutrient transport on DOC concentrations in drainage water. Methods Grab samples were collected monthly from two farms with pre-installed sediment ponds and two farms with barrier measures (leaky dams) installed in the drainage ditches in 2023 and 2024 for nutrient mitigation. Filtered samples were analysed for DOC concentrations. Results The results showed that DOC concentrations in the drainage ditch varied spatially due to regional differences in soils and landscape. On the two farms with sediment ponds the mean DOC concentrations for the downstream points were higher than the closest upstream points of the sediment ponds, implying that the measures did not reduce DOC concentrations at the outlet. Comparatively, on the two farms with leaky dams installed there were significant differences (p < 0.05) in the mean DOC concentrations between the closest upstream and downstream points of the leaky dams. In one of the farms, there was a significant reduction (p < 0.05) in DOC concentrations while in the other farm there was an increase of DOC concentrations in the downstream point, assumed locally to be caused by additional sources. Also, DOC concentrations on all farms varied temporally, influenced by a combination of high temperatures and rainfall in July 2023. Conclusion Leaky dams which are cost-effective to install, reduced DOC concentrations at most in-ditch locations when compared to sediment ponds which require machinery and expert labour for installation. Therefore, farmers can implement in-expensive mitigation measures, which target nutrient and sediment in-ditch losses on their farms, but importantly, these actions have co-benefits for also minimising DOC losses.

82. 题目: Machine Learning Attribution of Atmospheric Black Carbon in a Coastal City: Source Variability and the Sea–Land Breeze Recirculation Mechanism
文章编号: N26090418
期刊: Environmental Science & Technology
作者: Hao Yu, Xingyue Guo, Xinyu He, Mengyuan Luo, Dan Yao, Wenkang Gao, Guangxuan Yan, Pengtuan Hu, Xue Li, Menglin Liu, Xu Han, Zhiguo Cao
更新时间: 2026-09-04
摘要: Black carbon (BC) variability in coastal environments reflects the combined effects of emission sources, regional transport, and mesoscale circulation. This study selected the typical coastal city of Qingdao as the study area, collected BC online observation data for one year in 2021, and integrated it with the Aethalometer model, trajectory analysis, and Random Forest (RF) machine learning framework to examine these mechanisms. The annual mean BC concentration was 1.78 ± 1.29 μg m–3, with fossil fuel combustion contributing 88.2% of the total mass, while the biomass burning contribution increased to 19% in winter. Source-resolved attribution showed distinct meteorological responses. Fossil-fuel black carbon (BCff) was more strongly associated with wind-controlled ventilation and transport, whereas biomass burning BC (BCbb) responded more strongly to low-temperature conditions. Under sea–land breeze (SLB) conditions, BC enhancement was most evident at wind speeds of 2.0 to 3.5 m s–1. Diurnal persistence, directional shifts in elevated fossil fuel BC, and interactions between wind speed and wind direction further supported return transport and reaccumulation within coastal circulation. These findings provide process-based insight into source-dependent BC variability and SLB-related reaccumulation in coastal environments.

83. 题目: Manganese Oxides Incubated in Acidic Forest Soil Retain More Organic Carbon Than Iron Oxides
文章编号: N26090417
期刊: Environmental Science & Technology
作者: Kristen Bidas, Hui Li, Fernanda Santos, Erin C Rooney, Benjamin Reinhart, Lilin He, Changwoo Do, Qian Zhao, Ryan Tappero, Elizabeth Herndon
更新时间: 2026-09-04
摘要: Iron (oxyhydr)oxides are well-recognized contributors to soil carbon (C) storage, but the effects of manganese oxides on carbon storage and transformation are relatively unexplored. Here, the relative capacities of Fe and Mn oxides to bind and stabilize soil organic C were directly compared using an in situ incubation experiment. Quartz sands coated with either poorly crystalline Mn(III/IV) oxides or Fe(III) oxides, or left uncoated, were buried in a temperate forest soil for up to one year. Chemical extractions, X-ray absorption and photon spectroscopies, scanning electron microscopy, and neutron scattering were used to evaluate organic and mineral associations and transformations during the incubation. At the end of the 1-year study, Mn oxide stored ∼11× more carbon (42.0 ± 14.3 mg C/m2 oxide) than Fe oxide (3.72 ± 0.37 mg C/m2 oxide) per unit surface area. Manganese oxidation state changed over time, likely reflecting reactions between organic C and Mn oxide, while Fe oxidation state remained unaltered. Total organic C that was associated with Mn oxide was relatively enriched in carboxylic and O-alkyl-C compared to Fe oxides and quartz, either due to preferential sorption or oxidation on the mineral surface. Mn oxides also sorbed high amounts of Ca despite being incubated in an acidic, base-cation depleted soil, which potentially facilitated C sorption. Our study demonstrates that Mn oxides, with the assistance of Ca-bridging, have a greater potential to stabilize organic C than Fe oxides in acidic environments despite higher reactivity.

84. 题目: Coupled effects of vegetation and environmental factors on dissolved organic matter properties in coastal wetlands
文章编号: N26090416
期刊: Catena
作者: Zihan Zheng, Yingying Jiang, Tingcang Hu, Chao Ma, Xin Yao, Dietrich A Volmer, Yulin Qi
更新时间: 2026-09-04
摘要: Coastal wetlands are important blue carbon sinks, yet the mechanisms by which vegetation zonation and associated environmental gradients regulate dissolved organic matter (DOM) dynamics remain poorly understood. Here, we investigated soils from six vegetation zones along the sea–land gradient in the Yellow River Delta coastal wetland, including Spartina alterniflora (SA), bare flat (BF), inundated Suaeda salsa (I-SS), non-inundated Suaeda salsa (NI-SS), Tamarix chinensis (TC) and Phragmites australis (PA). Optical spectroscopy, FTIR and FT-ICR MS were combined to characterize changes in DOM concentration, composition and reactivity. Soil DOC exhibited a non-linear pattern along the gradient, first decreasing and then increasing from sea to land, with the lowest values in I-SS and the highest values in SA. This pattern reflected the combined effects of vegetation-derived carbon inputs, microbial processing and salinity-related environmental filtering. Spectral and molecular evidence further revealed pronounced DOM differentiation among vegetation zones. SA and BF were enriched in aliphatic and sulfur-containing compounds, showing relatively fresh molecular characteristics and potentially higher reactivity. By contrast, TC was characterized by more aromatic, oxygen-rich and structurally transformed compounds, suggesting more extensive oxidative processing and greater potential for persistence. NI-SS displayed transitional characteristics, with both fresh organic inputs and post-depositional transformation. Overall, DOM shifted from relatively fresh and potentially reactive fractions in seaward zones toward more aromatic, structurally complex and potentially persistent fractions in landward zones. These findings demonstrate that vegetation type, together with hydrological and microbial processes, jointly regulates DOM dynamics and carbon cycling along coastal wetland gradients.

85. 题目: Dynamic effects of oxytetracycline pollution on greenhouse gas emissions from wetlands: The synergetic regulatory roles of nutrients, DOM and microbiota
文章编号: N26090415
期刊: Journal of Environmental Chemical Engineering
作者: Xuecheng Wang, Yanye Li, Yang Li, Lixia Wang, Mingzhe Gao, Deshou Cun, Qichao Zhou, Junjun Chang
更新时间: 2026-09-04
摘要: Oxytetracycline (OTC), a typical tetracycline antibiotic frequently detected in wetlands as an emerging pollutant, can alter greenhouse gas (GHG) emissions from wetland systems. However, its temporally dynamic effects and underlying mechanisms remain poorly understood. In this study, the effects of OTC pollution at two levels, 50 and 500 μg kg−1 in sediment, on GHG emissions from wetlands at short-term (30 d) and long-term (80 d) periods and the synergetic regulatory roles of nutrients, dissolved organic matter (DOM) and microbial communities were assessed through a plant-free wetland microcosm experiment. The results showed that OTC notably stimulated CO2, CH4, and N2O emissions during the short-term exposure (P < 0.05), thereby substantially increasing the global warming potential (GWP) of the wetlands, with a stronger effect observed at the high-pollution level. After 80 d of OTC exposure, only CO2 emissions from these microcosms remained significantly elevated. Random forest analysis showed that increased CO2 emission was mainly associated with variations in sediment NO3--N, NO2--N, DOC, dissolved total nitrogen (DTN), humic-like and protein-like DOM components, and xylA gene abundance. Short-term CH4 increases were primarily related to humic-like and protein-like DOM components, sediment DOC, NO3--N, and NO2--N, whereas N2O increases were associated with nosZ abundance, DTN, and NO3--N. The findings demonstrated that OTC pollution notably altered nutrient, DOM, and microbial properties in the wetlands, especially during short-term exposure, and then considerably increased the GWP of wetlands. This study provides a scientific basis for wetland management under emerging pollutant stress.

86. 题目: Development and validation of detection method for PFAS in petroleum and petrochemical groundwater under high organic matter interference
文章编号: N26090414
期刊: Journal of Environmental Chemical Engineering
作者: Xingnan Zhou, Hui Luan, Tao Gu, Zi Long, Fangfang Ding, Kun Tong, Ting Cai, Xinwei Wang
更新时间: 2026-09-04
摘要: To address the challenge posed by conventional Per- and polyfluoroalkyl substances (PFAS) detection methods in petrochemical plant groundwater with high oil, salinity, and organic matter, this study developed a trace detection method integrating selective adsorption, deep purification, and anti-interference analysis, achieving accurate quantification of 18 PFAS. The approach specifically addressed technical bottlenecks in determining long-chain PFAS and mitigated matrix interference from oils. By optimizing solid-phase extraction (SPE) conditions, along with ultrasound-assisted extraction and vessel rinsing, the recoveries of 18 PFAS were significantly enhanced, with increases of 0.34–38.35% for the C8-C14 PFAS. Additionally, ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) conditions were optimized to achieve chromatographic separation of all 18 PFAS within 12minutes, significantly suppressing matrix effects and co-eluting interferences. The method demonstrated recoveries of 70.31–124.80%, intra- and inter-day relative standard deviations (RSDs) below 20%, method detection limits (MDLs) of 0.27–1.58ng/L, and method quantification limits (MQLs) of 0.81–4.74ng/L. When applied to groundwater samples from an oilfield and a refinery in China, target PFAS were successfully detected, with surrogate recoveries ranging from 71.11 to 127.51% and measured concentrations between ND and 5946.49ng/L. The predominant compounds detected were C4-C8 perfluoroalkyl carboxylic acids. This work provides an efficient and reliable technical framework for trace detection and source analysis of PFAS in oil-rich, high-complexity aquatic environments.

87. 题目: Boron-doped biochar with dual C-B-O/O-B-O sites as a super-anchor and electron-accelerator for nZVI-activated persulfate oxidation of imidacloprid
文章编号: N26090413
期刊: Environmental Research
作者: Zhengming Yang, Zhuochao Wang, Taiwen Li, Yang Xu, Tianyu Xu, Han Ding, Chuangshi Zhang, Yuzhuang Chen, Qiang Li, Rui Fang, Hongliang Cao
更新时间: 2026-09-04
摘要: Removing imidacloprid from water by persulfate oxidation remains challenging because the iron-based activators commonly used in these systems are prone to aggregation, passivation, and loss of reactivity. Among available advanced oxidation processes, nZVI-activated peroxydisulfate (PDS) is attractive for IMI degradation, but its performance is often compromised by inefficient oxidant utilization and poor catalyst durability. Herein, boron-doped biochar (BBC) with atomically dispersed functional sites was engineered to enhance nZVI catalytic performance. C-B-O sites served as robust anchoring sites, exhibiting a calculated Fe-binding energy of 391.98 kJ/mol and contributing to nZVI stabilization and improved activity retention after air exposure. Concurrently, O-B-O sites created polar microenvironments that promoted PDS enrichment and accelerated interfacial electron transfer, yielding an electron efficiency of 0.62 e− per PDS molecule. This dual-site architecture promoted the generation of O2·-, 1O2, SO4·-, and ·OH, as evidenced by radical-scavenging and electron paramagnetic resonance measurements. PBQ quenching caused the most pronounced suppression of IMI removal, indicating an important role of O2·-, whereas the characteristic TEMP-1O2 signal confirmed the involvement of a 1O2-associated non-radical pathway. DFT calculations further showed that the selected reaction pathways of O2·-, 1O2, SO4·-, and ·OH toward IMI exhibited different intrinsic energy barriers. Collectively, these results support the important involvement of O2·--mediated oxidation and 1O2-associated non-radical processes in IMI transformation under the investigated conditions. The catalyst achieved 91% IMI removal within 160 min and retained >96% of its initial activity after 30 days of air exposure. These findings provide a practical interfacial regulation strategy for designing carbon-supported iron catalysts with improved stability and enhanced PDS activation performance for persulfate-based water purification.

88. 题目: Iron-bound organic carbon formation governs the dual role of iron in anaerobic digestion of waste activated sludge: A stage-specific dosing strategy for enhanced methane recovery
文章编号: N26090412
期刊: Environmental Research
作者: Feifei Chu, Zhaofu Liu, Fangmei Cheng, Xiaomeng Zhang, Liyan Wei, Xinhou Zhang, Yun Chen, Lei Zhao, Fei Yang, Nan Shen
更新时间: 2026-09-04
摘要: Iron salts are widely used in sludge treatment, but their dual role in stimulating methanogenesis and immobilizing bioavailable organic carbon during anaerobic digestion remains insufficiently understood. This study investigated the effects of FeCl3 dosage and dosing timing on methane production, iron-bound organic carbon (Fe-OC) formation, and microbial metabolic activity during anaerobic digestion of waste activated sludge (WAS). The methane yield increased from 92.5 mL g−1 TS in the control to 108.9 mL g−1 TS at 20 mg g−1 TS, but decreased to 65.3 and 54.0 mL g−1 TS at 80 and 100 mg g−1 TS, respectively. High FeCl3 dosages promoted the substantial immobilization of organic carbon into the solid phase, where Fe-OC accounted for up to 67.6% of the TOC (at 100 mg g−1 TS). This profound carbon sequestration significantly restricted substrate bioavailability for methanogenic conversion. Furthermore, dosing iron during active digestion (day 5) yielded the highest methane production (147.8 mL g−1 TS), achieving a 73.1% increase over the control and outperforming day-0 and day-10 dosing by 37.4% and 58.8%, respectively. The dosing-time experiments showed that FeCl3 addition during the active digestion stage was more favorable than addition at the initial or late stage. The superior methane recovery achieved by day-5 Fe addition is attributed to a synergistic combination of reduced Fe-OC formation, optimized microbial community richness, sustained methanogen populations, and maximized enzymatic and electron transfer efficiencies. This study provides a practical strategy for improving methane recovery from WAS.

89. 题目: Effects of different biochar application rates on CH4 emissions and Microbial Carbon Pump (MCP) mediated carbon sequestration in paddy fields: a quantitative modeling approach
文章编号: N26090411
期刊: Journal of Environmental Management
作者: Yuefeng Li, Hongyu Chen, Jie Chen, Weiqin Jiang, Xiaoling Liu, Jie Liang, Ke Zhang, Bing Jiang, Hongbing Luo, Wancen Xie, Xiaochan An, Wei Chen, Zimu Yang, Xiaohong Zhang
更新时间: 2026-09-04
摘要: Biochar amendment is a proven strategy for mitigating methane (CH4) emissions and enhancing soil carbon sequestration in rice paddies. However, the depth-dependent dynamics of microbial carbon pump (MCP)-driven recalcitrant organic carbon (ROC) formation and the underlying microbial mechanisms remain poorly characterized, particularly in the purple paddy soils of the central Sichuan Basin, China. To address this gap, we developed a novel quantitative MCP-driven ROC model and conducted a field experiment with four biochar treatments (CK, C2, C4, and C6 t ha−1) to investigate CH4 emissions, methane-cycling microbial community, and soil carbon fractions across a 0–80 cm profile. Biochar amendment significantly reduced CH4 emissions by 57.88–84.51% (peaking at 6 t ha−1) and increased methanogen and methanotroph diversity by 1.30–1.66 times. Although the concentrations of soil organic carbon (SOC), dissolved organic carbon (DOC), microbial biomass carbon (MBC), and absolute ROC decreased significantly with depth, the ROC/SOC ratio consistently increased. Crucially, our quantitative model revealed that biochar stimulated both the in vivo turnover and ex vivo modification pathways of the MCP by supplying essential labile substrates, explaining up to 92% of the variance in deep-soil carbon fractions. In conclusion, this study demonstrates that biochar serves as an effective dual-action strategy: mitigating CH4 emissions via microbiome regulation while enhancing long-term carbon sequestration through intensified MCP-driven ROC formation across the entire soil profile.

90. 题目: Solid waste-derived biochar: An effective additive for enhancing CO2 absorption, suppressing NH3 slip, and saving energy in mild-temperature ammonia solutions
文章编号: N26090410
期刊: Journal of Cleaner Production
作者: Yu Pan, Longjie Yu, Jiahui Lei, Zehuang Zhang, Jianlong Jin, Qunxing Huang
更新时间: 2026-09-04
摘要: Ammonia-based CO2 capture is a promising technology due to the high absorption capacity and low regeneration energy consumption. However, its large-scale application is hindered by slow CO2 absorption rate, high ammonia loss, and large refrigeration investment (particularly in Chilled ammonia process (CAP)). To address these challenges, a low-cost functional additive was prepared by converting textile dyeing sludge and corncob into gradient porous biochar. Under optimal conditions, the addition of biochar produced at 800 °C (SC800) increased CO2 uptake by 3.88% to 5.82% and decreased ammonia slip by 46.52% to 79.54% compared with the ammonia solution alone. The optimal operation temperature of the modified absorption system was elevated to 25 °C, which could potentially reduce the energy consumption by 0.010–0.138 GJ/t CO2 captured compared to CAP. Molecular dynamics (MD) simulation indicated that the biochar promoted diffusion and mass transport of CO2 and NH3 molecules within the pore channels. Correlation analysis revealed that biochars with higher mesopore volume and quaternary nitrogen content, together with lower pyrrolic nitrogen content, exhibited better performance on CO2 absorption enhancement and NH3 slip inhibition. The absorption–desorption cycling experiments further demonstrated the potential of SC800 for practical CO2 capture applications, with only a 5.16% decreased in CO2 uptake and an 11.60% increase in NH3 slip after 5 cycles. Furthermore, the resulting mixture of biochar and fine NH4HCO3 crystals showed potential as a nitrogen-stabilized fertilizer. This work provides a sustainable route for converting solid wastes into high-value additives for more efficient and flexible ammonia-based CO2 capture.

91. 题目: Extracellular polymeric substances: overlooked contributors to soil organic carbon persistence
文章编号: N26090409
期刊: Soil Biology and Biochemistry
作者: Yichao Wu, Yuwei Yi, Minsu Kim, Samuel Bickel, Ming Zhang, Ke Dai, Chunhui Gao, Chenchen Qu, Chuisi Kong, Mengxi Feng, Ke-Qing Xiao, Hans-Curt Flemming, Yu-Rong Liu, Wenfeng Tan, Qiaoyun Huang, Chao Liang, Peng Cai
更新时间: 2026-09-04
摘要: Microbial contributions to the persistence of soil organic carbon (SOC) are often attributed to the long-term accumulation of microbially derived products, primarily cellular residues. Beyond cellular products, microbes also synthesize and secrete a group of ubiquitous, adhesive macromolecules known as extracellular polymeric substances (EPS). Although the involvement of soil EPS in SOC persistence has long been suggested, their quantitative contribution and underlying mechanisms remain poorly resolved. In this review, we synthesize current knowledge to highlight that, although EPS quantified using existing methods account for approximately 2% of SOC, their production often matches or exceeds microbial cellular biomass production, indicating that EPS represent a major microbial carbon flux to soil. We outline four mechanisms by which EPS contribute to SOC stabilization: the direct formation of (i) mineral-associated organic matter and (ii) geopolymers through mineral-catalyzed Maillard-type reactions, and the indirect protection of SOC through (iii) enhanced soil aggregation and (iv) modification of soil pore structure to physically constrain decomposition. We propose that EPS-mediated stabilization represents an important, yet underrecognized, component of microbial control over SOC persistence and explicitly incorporate EPS into the soil microbial carbon pump (MCP) framework. This framework distinguishes the in vivo extracellular route of EPS production from the in vivo cellular route of biomass production, providing a process-based basis for developing testable hypotheses on how cellular and extracellular microbial carbon fluxes jointly regulate SOC formation and persistence. Key research priorities include developing robust approaches for soil EPS extraction and quantification, incorporating EPS dynamics into SOC models, and obtaining a mechanistic understanding of environmental and microbial controls on EPS production and degradation. Addressing these gaps will significantly refine our understanding of microbial contributions to the terrestrial carbon cycle and inform strategies to enhance soil carbon storage.

92. 题目: Sources and composition of suspended particulate organic matter in Admiralty Bay and the Bransfield Strait, Antarctic Peninsula
文章编号: N26090408
期刊: Marine Chemistry
作者: Milena Ceccopieri, Ana Cecília R de Albergaria-Barbosa, Letícia Lazzari, Francine A Kalas, Moacyr Araujo, Renato S Carreira
更新时间: 2026-09-04
摘要: Suspended particulate organic matter (POM) plays a central role in carbon cycling and trophic transfer in Antarctic waters, yet its sources, composition, and degree of transformation remain poorly constrained in nearshore Antarctic Peninsula. Here, we characterize the elemental (C and N), isotopic (δ13C and δ15N), and lipid biomarker (alcohols, sterols, and fatty acids) composition of suspended POM collected in Admiralty Bay and the Bransfield Strait, south of King George Island, during late austral spring 2019. Surface samples were collected at 12 stations, whereas DCM samples were collected at 6 of these stations. Suspended particulate matter concentrations ranged from 5.4 to 21.9 mg L−1 and showed marked variability between the two sampling campaigns. Molar C/N ratios and lipid biomarker distributions indicate a predominance of marine-derived, phytoplankton-associated OM, largely linked to diatom-rich assemblages with minor contributions from other marine sources. Diagnostic lipid biomarker ratios further suggest that suspended POM was relatively fresh and had undergone limited early diagenetic alteration. Paired comparisons between surface and DCM samples revealed no statistically significant depth-related differences, indicating limited vertical variability in OM composition within the upper water column. The results show that physical forcing primarily regulates particle loads, whereas biological production exerts stronger control on OM composition and quality, highlighting the sensitivity of Antarctic coastal carbon cycling to ongoing environmental changes along the Antarctic Peninsula.

93. 题目: N,S-Doped Rice Husk Biochar: A High-Capacity and Sustainable Adsorbent for Efficient Oxytetracycline Hydrochloride Removal from Water
文章编号: N26090407
期刊: Water, Air, & Soil Pollution
作者: Huyen Anh Trinh, Van-Doan Nguyen, The Anh Luu, Van-Giang Le
更新时间: 2026-09-04
摘要: The continued occurrence of antibiotics in the aquatic medium requires new adsorbent materials with low cost but high efficiency. This study developed N,S-RHBC material based on rice husk biochar, co-doped with nitrogen and sulfur combined with KOH activation, creating a porous framework and high density of functionalities suitable for the elimination of oxytetracycline hydrochloride. The optimal material was obtained at the ratio of RHBC:KOH:thiourea 1:3:1, temperature 700 °C, achieving an adsorption efficiency of 96.27% after 100 min and Langmuir capacity of 448.43 mg/g. The kinetics followed second order (R2 = 0.999), while Langmuir accurately depicted monolayer adsorption. The uptake process was spontaneous, with ΔG° from -5.723 to -6.351 kJ/mol, ΔH° = 0.678 kJ/mol, and ΔS° = 20.906 J/mol·K. Monovalent ions had little effect, while Mg2+, Ca2+, and especially NO3– significantly reduced the adsorption capacity, CO32– alone maintained a nearly stable qe (155.43–160.43 mg/g). The material also strongly adsorbed many other pollutants, with efficiencies: Methyl Orange 95.7%, Methyl Blue 97.67%, Ciprofloxacin 94.34%, Oxytetracycline hydrochloride 96.27%, Tetracycline hydrochloride 98.75%. Practical application potential is confirmed by the material's significant reusability (86.54% capacity retention after 6 cycles) and robust performance in complex matrices, achieving 95.43% and 86.54% removal in urban wastewater and river water, respectively. The robust adsorption capacity, coupled with excellent regenerability and performance in complex matrices, positions N,S-RHBC as a sustainable and highly effective material for tackling antibiotic pollution in eflluent.

94. 题目: Vegetation restoration enhances mineral-associated organic carbon accumulation through microbial–mineral interactions in subtropical forest soils
文章编号: N26090406
期刊: Plant and Soil
作者: Yilin Fan, Ying Li, Min Luo, Zhou Qian, Weijuan Qiu, Lei Chen, Yuanchun Yu
更新时间: 2026-09-04
摘要: Background Soil organic carbon (SOC) accumulation is crucial for ecosystem restoration and climate mitigation in tropical and subtropical red soils, yet the mechanisms linking vegetation restoration to iron (Fe)-associated carbon pools and microbial functional genes remain unclear. Methods This study explored the interactions between soil minerals and microbial communities that drive soil organic carbon accumulation during subtropical vegetation restoration in China. We integrated sequential selective dissolution, extracellular enzyme activity measurements, and metagenomic analyses to assess Fe-associated carbon pools and microbial functional potential. Results The results showed that vegetation restoration promoted mineral-associated organic carbon (MAOC) accumulation and enhanced its stabilization potential by reorganizing mineral-associated carbon pools, with organo-metal complexes (OMC) accounting for 62%–76% of the total extracted carbon and the proportion of crystalline and residual mineral-associated carbon pools (Crys) declining from 24% in young coniferous forest (CK) to 11% in broad-leaved forest (BF). Vegetation restoration also strengthened Fe-associated carbon protection, as reflected by the increasing Fe concentration in the OMC pool, which reached 6146.97 mg·kg−1 in BF. Activities of carbon-degrading enzymes increased along the restoration gradient, accompanied by the relative enrichment of Chloroflexi and Actinobacteria in early-stage forests and Acidobacteria and Basidiomycota in later-stage forests. Metagenomic analyses revealed a functional transition from labile carbon degradation pathways and Calvin cycle-related genes in early stages to recalcitrant carbon degradation and reductive tricarboxylic acid cycle (rTCA)-associated pathways in later stages. Strong associations among recalcitrant carbon degradation genes, rTCA-related genes, and MAOC pools highlighted the role of microbes in regulating carbon partitioning and MAOC accumulation during vegetation restoration. Conclusion Vegetation restoration was associated with coordinated changes in Fe-associated mineral fractions, microbial functional groups, and mineral-associated carbon pools. These linked changes suggest that microbial–mineral coupling contributes to the transformation of soil carbon from fast-cycling pools toward mineral-associated forms, thereby promoting MAOC accumulation and enhancing carbon stabilization potential in eroded red soils.

95. 题目: Marine-continental influences on soil organic matter and antioxidant activity in an Arctic Coastal Catena (Barents Sea)
文章编号: N26090405
期刊: Catena
作者: Svetlana V Deneva, Elena V Shamrikova, Oksana G Shevchenko, Andrey N Panyukov, Olesya S Kubik
更新时间: 2026-09-04
摘要: Arctic coastal ecosystems are important carbon reservoirs, but the mechanisms of organic matter stabilization across marine-continental gradients remain unclear. This study investigates a catena in the Barents Sea region, from salt marshes to watershed peatlands, by analysing vegetation, allochthonous inputs (algae, sediments, guano), soil properties, and antioxidant activity (AOA). Vegetation shifts from halophyte-dominated marshes to oligotrophic bogs. Soil organic carbon (SOC) stocks increase from 546 to 1276 Mg C ha−1 (0–100 cm), with water-soluble OC accounting for 2–13%. Persistent Mg2+ dominance over Ca2+ (Ca:Mg = 1:5 in guano) confirms marine influence. For the first time, we assessed AOA in soil, surface deposits, and biogenic materials using complex methods (the Folin-Ciocalteu, the radical scavenging activity (RSA), and the ability of samples to inhibit Fe2+/ascorbate initiated lipid peroxidation of a model substrate containing lipids). The use of this method made it possible to identify strong АОА in samples of surface deposits and marine algae that do not exhibit high RSA. This highlights the need for biologically relevant models when studying extracts of natural substances. Our results demonstrate that coastal Arctic functioning depends on the balance between allochthonous marine inputs and autochthonous bog processes. Limitations include limited spatial replication and the absence of seasonal data; future studies should employ high-resolution mass spectrometry to resolve molecular drivers. Despite these constraints, this work provides a quantitative framework linking antioxidant properties to carbon storage in Arctic coastal gradients, which is essential for predicting ecosystem responses to ongoing environmental change.

96. 题目: Drinking water purification by electron transfer from dissolved organic carbon to microorganisms via dual-electric centers
文章编号: N26090404
期刊: Bioresource Technology
作者: Chihao Yang-Zhou, Wu Cai, Weixiang Liao, Shaojie Wang, Xueci Xing, Lili Zhang, Peng Zhang, Yumeng Wang, Chun Hu
更新时间: 2026-09-04
摘要: Drinking water safety is confronted with escalating challenges from dissolved organic carbon (DOC) comprising natural organic matter (NOM) and micropollutants. Herein, multi-objective purification was carried out through a dual-electric centers Fe, Al-complexed graphene-like supported on commercial alumina (Fe, Al-GL/A2O3) biofilter for sand-filtered water from the Pearl River water source in China. About 31.8 % of all antibiotics in the raw water were removed, while C/N-disinfection byproducts formation potential (DBPFP) were decreased 33.2 % and 25.7 %, along with 32.3 % antibiotic resistance genes (ARGs) reduction and opportunistic pathogen suppression. These observations were superior to the conventional biological activated carbon (BAC) process that causes the accumulation of antibiotics with greater ARG and DBPFP. The unusual effects issue may from the synchronous destruction DBPs precursor and micropollutants through the electrons of electron-rich area of DOC persistently transferring to electroactive bacteria enriched on Fe, Al-GL/A2O3 by the charge transfer channel DOC → GL → Fe species → extracellular polymeric substance (EPS). All these came from DOC-EPS coordination on Fe, Al-GL/A2O3 inducing surface charge redistribution and stronger electric field. Notably, it also promoted exogenous electrons-facilitated electrotrophic and autotrophic microbial metabolism in the biofilter. This study achieved oxidant-free, multi-objective purification of drinking water, providing a practical, green, and sustainable strategy for ensuring drinking water safety.

97. 题目: Linking microbial resource limitation and life-history strategies to soil organic carbon accumulation under long-term rice–crayfish co-culture
文章编号: N26090403
期刊: Soil and Tillage Research
作者: Linsen Du, Hua Wang, Zhuoni Xie, Yili Ge, Zhen Zhang, Xiaolin Kuang, Junliang Xin, Jun Yang
更新时间: 2026-09-04
摘要: Rice-crayfish (RC) co-culture is regarded as a promising rice management system for increasing soil organic carbon (SOC) accumulation. However, how microbial resource limitation is linked to SOC accumulation under long-term RC co-culture remains poorly understood. Therefore, we selected RC systems with cultivation durations of 1, 6, 10, and 15 years (RC1y, RC6y, RC10y, RC15y), with rice monoculture (RM) as the reference system, to investigate SOC fractions, soil physicochemical properties, microbial resource limitations, microbial community traits, functional gene profiles, and their interrelationships across a long-term RC co-culture chronosequence. Results showed that relative to the RM system, the RC10y and RC15y systems had lower bulk density and higher soil water content and cation-exchange capacity, together with greater nutrient availability, SOC fractions, and microbial biomass. Microbial C limitation declined along the RC chronosequence, whereas relative nutrient limitation shifted from N limitation in the RC1y and RC6y systems to P limitation in the RC10y and RC15y systems. Long-term RC promoted a transition from r- to K-strategy microbes. The decreased abundances of C degradation genes and increased abundances of P mineralization genes were found in the long-term RC systems. Random forest analysis, Mantel tests, and path modeling collectively identified that long-term RC co-culture could alter microbial resource limitations by modifying microbial community structure and functional gene abundance, ultimately affecting SOC accumulation. Overall, long-term rice-crayfish co-culture promoted SOC accumulation, accompanied by alleviated microbial C limitation, a transition from N to P limitation, and a shift toward resource-conservative microbial life-history strategies. These findings provide insights for optimizing paddy soil carbon management.

98. 题目: Biochar paradoxically increases rill erosion risk during the short term following its application to distinct loess textures
文章编号: N26090402
期刊: Soil and Tillage Research
作者: Zhongxuan Cao, Fengbao Zhang, Shuqi Li, Xuantian Li, Nan Shen, Seyed Hamidreza Sadeghi, Mingyi Yang
更新时间: 2026-09-04
摘要: Biochar amendment is widely recognized for its potential to enhance soil quality and control erosion over mid- to long-term periods. However, its short-term impact on rill erosion, particularly on soil detachment capacity (Dc) and rill erodibility (Kr), remains poorly understood across different soils. This study conducted flume experiments under varying hydrodynamic conditions (15° and 25° slope gradients; 12, 24, 36 L min−1 flow discharge rates) on five representative loess soils from the Loess Plateau, China, comparing untreated controls with soils amended with 3% corn straw biochar. Contrary to the common assumption of erosion mitigation, this study found that short-term biochar amendment universally increased Dc (by 19–264%) and generally raised Kr (by up to 218%) across all soil types, with the finest-textured clay loess being the most sensitive, whereas critical shear stress (τc) responses were soil-dependent. This unintended effect is likely associated with freshly incorporated biochar acting as discrete particles that disrupt native soil structure before stable organo-mineral associations develop. Soil organic carbon (SOC) was identified as the dominant factor controlling Dc and Kr. However, its accumulation was temporarily decoupled from erosion resistance, as its effects were expressed primarily through indirect pathways involving aggregate stability and porosity. Stream power (ω) was the optimal hydrodynamic predictor for Dc. Accordingly, we developed multivariate predictive models for Dc (including ω, SOC, mean weight diameter (MWD), capillary porosity (CP), and median particle diameter (D50); R2 = 0.669) and for Kr (SOC, MWD, specific surface area (SSA), and CP; R2 = 0.832). Our findings reveal a critical short-term erosion risk window, where biochar application may initially exacerbate rill erosion, providing a crucial temporal perspective for its management in erosion-prone landscapes.

99. 题目: Phenol-quinone redox cycling enables oxygen-dependent H2O2-assisted As(III) oxidation by pine-sawdust biochar
文章编号: N26090401
期刊: Environmental Technology & Innovation
作者: Siyao Wang, Lei Wen, Zhimin Xu, Gang Chu, Kexin Chang, Hongbo Peng, Dandan Zhou, Peng Gao, Yang Liu, Bo Pan
更新时间: 2026-09-04
摘要: Biochar (BC)-mediated aerobic oxidation of arsenite (As(III)) has been reported, but the coupling among phenol-quinone redox cycling, O2 activation, and pH-regulated H2O2 formation remains insufficiently resolved. In this study, pine-sawdust-derived BC and molecular analogues of phenolic/quinoid moieties, hydroquinone (HQ) and 1,4-benzoquinone (BQ), were used to examine As(III) oxidation at pH 3.0, 7.0, and 9.5 under oxic and oxygen (O2)-limited conditions. Under oxic conditions, BC oxidized 42.4%, 21.6%, and 74.7% of As(III) after 24 h at pH 3.0, 7.0, and 9.5, respectively, whereas arsenate (As(V)) formation was negligible under O2-limited conditions. BC generated hydrogen peroxide (H2O2) in air-equilibrated suspensions, with maximum concentrations of 88.5, 38.8, and 204.2 μM at pH 3.0, 7.0, and 9.5, respectively·H2O2-associated pathways contributed an estimated 69.2%, 77.2%, and 67.4% to As(III) oxidation at pH 3.0, 7.0, and 9.5, respectively. Superoxide dismutase suppressed O2•- generation without affecting H2O2 accumulation or As(III) oxidation, indicating that O2•- primarily served as an intermediate in H2O2 formation. Tert-butanol negligibly altered As(V) formation, consistent with the absence of detectable •OH. The BQ/HQ model system confirmed the chemical feasibility of quinone reduction, HQ re-oxidation by O2, and associated H2O2 generation, but it should be interpreted as a molecular analogue rather than direct proof of the heterogeneous BC surface mechanism. Overall, BC mediates As(III) oxidation mainly via O2-dependent H2O2 production promoted by phenol-quinone-like redox cycling, while the non-monotonic pH trend (pH 9.5 > pH 3.0 > pH 7.0) reflecting the combined effects of As(III) speciation, surface redox behavior, and H2O2 availability.

100. 题目: Perennial crops enhance the association between microbial biomass and soil organic carbon sequestration
文章编号: N26090318
期刊: Agriculture, Ecosystems & Environment
作者: Yundi Bai, Jiacong Zhou, Jørgen Eivind Olesen, Raúl Ochoa Hueso, Kees Jan van Groenigen, Pete Smith, Thomas Kätterer, Carlos Martínez-Núñez, Yakov Kuzyakov, Josep Peñuelas, Marshall D McDaniel, Ji Liu, Sheng Wang, Bin Wang, Lennart Olsson, Carsten W Mueller, Huanyuan Zhang-Zheng, Ning Dong, Imran Ahammad Siddique, Ji Chen
更新时间: 2026-09-03
摘要: Perennial cropping systems are increasingly promoted for providing a wide range of ecosystem services in agriculture, including climate change mitigation through soil organic carbon (SOC) sequestration. However, the microbial mechanisms underlying SOC sequestration remain unresolved. We conducted a global meta-analysis of 84 peer-reviewed studies comprising 514 paired comparisons between perennial and annual cropping systems. Results showed that compared with annual cropping systems, perennial cropping systems simultaneously increased SOC and microbial biomass carbon (MBC) in the topsoil (0–30 cm) by 15% and 37%, respectively. The log response ratio of MBC was statistically associated with the log response ratio of SOC, explaining 51% of the variance in SOC response. A framework based on partial least squares path modeling demonstrated that increases in MBC were more strongly associated with SOC accrual than with a wide range of environmental factors. Overall, our findings provide evidence that increases in MBC are statistically associated with SOC accrual in perennial cropping systems, indicating a critical role of microbial processes in shaping the SOC accrual potential of perennial systems. These results underscore the need to integrate soil biological mechanisms into carbon management strategies and highlight the potential of adopting perennial crops for climate-smart cropping systems.