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1. 题目: Dissolved organic matter inhibit the degradation process of polystyrene nanoplastic under Utraviolet light
文章编号: N26010820
期刊: Water Research
作者: Si-Jia Liu, Jing-Jing Yang, Wei-Lin Huang, Ting-Ting Cai, Jing-Yi Gu, Zhi Dang, Chen Yang
更新时间: 2026-01-08
摘要: Nanoplastics (NPs) have higher surface energy and reactivity due to their nano-scale effects, but there is still uncertainty about the impact of dissolved organic matter (DOM) commonly in the environment on the photoaging process of NPs. This study investigates the ROS photogeneration process of polystyrene nanoplastics (PSNPs) in the presence of DOM under UV irradiation. Our results show that the addition of DOM inhibits the photoreactivity of PSNPs, as evidenced by a smaller reduction in particle size and a decreased abundance of oxygen-containing functional groups on the PSNPs surface. The inhibition mechanism involves light shielding and quenching effects, with lower singlet oxygen (1O2) and superoxide radical (O2•−) formation when DOM and PSNPs are mixed. The quenching of triplet states (3PSNPs* and 3DOM*) prevents efficient energy transfer to oxygen, thus lowering 1O2 formation. Additionally, O2•− reacts with DOM’s C-H bonds to form hydroperoxide or peroxy radicals, further decreasing ROS production. The photogeneration mechanism of the interaction between PSNPs and DOM is proposed for the first time from the point of view of energy transfer and electron transfer. This study provides a deep understanding of the photoreactivity of PSNPs in natural water environment under UV irradiation and emphasizes the role of DOM.
2. 题目: Coarse Root Enhancement Increases Soil Organic Carbon While Decreasing Its Stability in a Wetland
文章编号: N26010819
期刊: Environmental Science & Technology
作者: Zhenghao Liang, Jia Song, Ruifeng Sun, Mingliang Zhao, Siyu Wei, Weimin Song, Xiaojie Wang, Xiaojing Chu, Xiaoshuai Zhang, Changsheng Jiang, Guangxuan Han
更新时间: 2026-01-08
摘要: Wetland soil organic carbon (SOC) sequestration effectively reduces atmospheric CO2. Fractionating SOC into labile particulate organic carbon (POC) and stable mineral-associated organic carbon (MAOC) is crucial for predicting its stability. Precipitation-induced variations in coarse (>2 mm) and fine (<2 mm) roots are key regulators of SOC stability, but their specific contributions remain unclear. Here, we conducted a 10-year field simulation of precipitation changes (−60%, −40%, 0%, + 40%, + 60%) in a wetland. We found that increased precipitation enhanced Gramineae abundance, thereby increasing coarse-root biomass, while fine roots changed little. Compared to CK, coarse roots directly boosted topsoil POC (+37.4%) and enhanced MAOC (+31.5%) via microbial stimulation. Furthermore, increased coarse-root biomass was associated with greater vertical transport of DOC and nitrate (NO3–), potentially contributing to higher subsoil POC (+218.7%) and MAOC (+17.2%). With increasing precipitation, the MAOC/POC ratio decreased from 1.65 to 1.11 in the topsoil and from 8.73 to 2.66 in the subsoil, suggesting that coarse roots favored POC over MAOC, increasing SOC but reducing its stability. These results provide mechanistic insights into wetland carbon-climate feedbacks under altered precipitation regimes.
3. 题目: Oxidative Potential of Atmospheric Particulate Matter: A Review of the Role of Metal−Organic Interactions, Mechanistic Insights, and Key Determinants
文章编号: N26010818
期刊: Environmental Science & Technology
作者: Manfei Lin, Jian Zhen Yu
更新时间: 2026-01-08
摘要: Oxidative stress, resulting from antioxidant depletion or excessive reactive oxygen species (ROS) production, is a key mechanism linking ambient particulate matter (PM) exposure to adverse health effects. The oxidative potential (OP) of PM, a measure of inhaled PM’s capacity to deplete antioxidants or generate ROS, is largely driven by transition metals (TMs) such as iron and copper. However, coexisting organic matter also modulates OP, both directly through its own redox activity and indirectly via interactions with TMs that alter redox cycling. This review synthesizes current understanding of TM−organic interactions and their influence on the OP of PM, as assessed by acellular assays. We discuss mechanistic insights, key determinants, and the complexity of these interactions. The importance of considering TM−organic interactions in evaluating aggregate OP from individual components and apportioning OP to specific chemical species is highlighted, with implications for mechanistic studies and health risk assessment.
4. 题目: Coupled Reactive Regulation by Microplastic-Derived Dissolved Organic Matter Sustains Reactive Oxygen Species Cycling in Laccase-Metal Synergy for Continuous Microplastic Degradation
文章编号: N26010817
期刊: Environmental Science & Technology
作者: Rui Ding, Xiaoling Shan, Ling Ding, Xinran Qiu, Bin Zhang, Xian Li, Xujun Liang, Xuetao Guo
更新时间: 2026-01-08
摘要: Microplastics (MPs) persist in the environment due to their chemical inertness and structural stability, underscoring the need for effective degradation strategies. Here, we develop a surface-confined cascade system in which laccase is coupled with metal ions (Na+, Cu2+, Fe3+) to activate reactive oxygen species (ROS) for the degradation of three representative polymers─polyethylene (PE), polyethylene terephthalate (PET), and polylactic acid (PLA). The laccase-Cu2+ system (optimal at 0.1 mM) exhibited the strongest catalytic performance, inducing substantial oxidative transformation of MPs, as reflected by pronounced increases in O/C ratios and extensive disruption of polymer surface chemistry. Among the three polymers, PLA showed the highest degradation susceptibility owing to its lower crystallinity, labile aliphatic ester linkages, and enhanced responsiveness to ROS. In situ-generated MPs-derived dissolved organic matter (MPs-DOM) further regulated interfacial redox processes by accelerating electron transfer to metals, stabilizing reduced species, and sustaining ROS cycling. XPS and solution-phase analyses corroborated the DOM-assisted metal redox cycling at polymer interfaces. Multivariate modeling identified humic-like components and oxygenated moieties as the dominant ROS predictors. These findings reveal MPs-DOM as an active redox mediator that reinforces laccase-metal synergy, enabling persistent ROS generation and progressive MPs degradation.
5. 题目: Stabilization of organic matter in topsoils under different tundra vegetation in Central Spitsbergen (high Arctic)
文章编号: N26010816
期刊: Catena
作者: Anna Bartos, Łukasz Musielok, Wojciech Szymański
更新时间: 2026-01-08
摘要: Soil organic matter (SOM) stability in Arctic soils is a key factor influencing carbon sequestration and greenhouse gas emissions, particularly in the context of climate change. Despite numerous studies on carbon stocks in the Arctic, a significant knowledge gap remains regarding the mechanisms of SOM stabilization and their impact on the quantity and quality of SOM across different tundra vegetation types. The main aim of this study was to determine SOM characteristics in surface horizons of permafrost-affected soils covered with different tundra vegetation types (pioneer tundra, arctic meadow, moss tundra, and heath tundra) in the central part of Spitsbergen (Svalbard). Physical fractionation was used to separate SOM into POM (particulate organic matter) and MAOM (mineral-associated organic matter) fractions, while particle-size fractionation was applied to evaluate SOM distribution and composition in sand, silt, and clay fractions. The results indicate that in topsoils under heath tundra POM fractions dominate the carbon and nitrogen pools, whereas in pioneer tundra topsoils, the majority of the carbon and nitrogen are stored in MAOM fractions. Moreover, a substantial proportion of SOM is occluded within macro- and microaggregates. Furthermore, the results obtained from FTIR analysis revealed substantial differences in the chemical properties of individual soil fractions, both concerning the degree of occlusion in aggregates and across particle size fractions. This study provides clear evidence that tundra vegetation types significantly influence both the spatial distribution and chemical composition of SOM in the topsoils of central Spitsbergen.
6. 题目: Cross-modal integration framework for soil organic matter estimation using proximal and satellite spectral data: Modeling optimization with particle size effects and spatial similarity
文章编号: N26010815
期刊: Geoderma
作者: Mingchang Wang, Xingnan Liu, Yilin Bao, Jialin Cai, Liheng Liang, Yiting Fan, Hongchao Fan
更新时间: 2026-01-08
摘要: Remote sensing (RS) technology enables the rapid and accurate acquisition of soil organic matter (SOM) content, which is crucial for ensuring food security and promoting precision agriculture. Multispectral imagery is widely used for large-scale SOM mapping, but its limited spectral resolution substantially constrains estimation accuracy. While proximal hyperspectral data provide detailed spectral information, their point-based observations limit scalability across large regions. To overcome these limitations, a cross-modal modeling framework integrating proximal hyperspectral and satellite spectral data was proposed. Hyperspectral reconstruction technology was applied to enhance satellite spectral resolution and to extend proximal hyperspectral observations into spatially continuous imagery, achieving a balance between spectral accuracy and spatial continuity. To address SOM spatial heterogeneity, a spatial similarity-based random forest (SS-RF) local modeling strategy was introduced. Furthermore, the study systematically evaluated the impact of different soil particle size levels on spectral reflectance and SOM estimation accuracy. This study was conducted in a typical black soil region located in Northeast China. A multimodal dataset was constructed for SOM modeling, including in-situ and laboratory hyperspectral data with multiple particle size treatments, as well as satellite imagery from Zhuhai-1 and Sentinel-2A. The results indicated that the proposed cross-modal fusion and SS-RF framework demonstrated superior SOM estimation performance. The reconstructed hyperspectral imagery effectively integrated proximal and satellite spectral data, thereby preserving spectral integrity and enhancing their correlation with SOM. Among these, the reconstructed imagery based on finer particle sizes (100 mesh, ≤0.15 mm) exhibited the best performance (R2 = 0.874, LCCC = 0.756, RMSE = 2.871 g·kg−1, and RPIQ = 2.159), while the reconstruction using 50 mesh particles (≤0.35 mm) also achieved comparatively good accuracy (R2 = 0.864). In contrast, the model constructed using field in-situ hyperspectral reconstructed imagery produced the lowest accuracy (R2 = 0.730). The estimation accuracy based on the reconstructed imagery was significantly higher than that achieved using Sentinel-2A (R2 = 0.712) and Zhuhai-1 (R2 = 0.759). Compared to traditional global models, the proposed SS-RF local strategy improved accuracy, increasing R2 by 7.64 %. This synergistic optimization approach, which combines spectral reconstruction, local modeling, and particle size standardization provides new insights and technical support for high-precision SOM estimation at the regional scale.
7. 题目: Photo-transformation of dissolved organic matter coupled with iron minerals upon hydrological particulate resuspension-settlement
文章编号: N26010814
期刊: Journal of Hydrology
作者: Na Huang, Yiying Wang, Yin Lu, Xuyin Yuan, Yilan Jiang, Lin Chen, Shishu Zhu, Shouliang Huo, Dawei Wang
更新时间: 2026-01-08
摘要: Frequent resuspension-settlement (RS) processes change the suspended particulate matter (SPM) redistribution. However, how the RS process affects the photo-transformation of DOM coupled with iron minerals remains unclear. This study reveals the impacts of the RS process on the photo-transformation pathways and products of fulvic acid (FA) coupled with goethite (α-FeOOH). The RS process changed the vertical distribution of SPM and enhanced the light absorption efficiency of α-FeOOH, which accelerated the production of reactive oxygen species (ROS). This process also enhanced the photocatalytic degradation of FA over α-FeOOH and benefited the production of refractory components, which thus hindered the mineralization of FA and decreased the bioavailability of the products. Furthermore, the established numerical equations showed that the particle volume fraction of α-FeOOH and the fluorescence intensity (FI) of its products exhibited a nonlinear correlation (R2 = 0.5735, RMSE = 3.4320). At a particle volume fraction of 0.07 %, the photochemical inhibition of α-FeOOH on FI conversion reached its maximum. This work reveals that frequent RS processes enhance the abiotic formation of refractory DOM mediated by iron minerals, which consequently alters the transformation of DOM.
8. 题目: Positively charged nano-CuO/N-doped pomegranate peel biochar for efficient degradation of chloroquine phosphate and phosphorus recovery
文章编号: N26010813
期刊: Separation and Purification Technology
作者: Bo Xu, Zhengcai Zhu, Silin Yang, Haiyan Yang, Jing Yang, Zhengjun Shi, Dawei Wang
更新时间: 2026-01-08
摘要: Regulating the surface charge of biochar is crucial for its catalytic performance and adsorption capability. Here, Cu2+ and melamine (Me) modified pomegranate peel powder (Cu-Me-PP) was prepared by coordination self-assembly method using waste pomegranate peel as the raw material. Then, nano-CuO and N-graphite doped biochar (CuO-N-PC) with positively charged surfaces were successfully prepared by pyrolysis of Cu-Me-PP and valence state regulation. The CuO-N-PC-300/ peroxymonosulfate (PMS) system could completely degrade the chloroquine phosphate (CQ) antibiotic within 30 min. Moreover, the effects of catalyst dosage, PMS dosage, solution pH, CQ concentration, and coexisting ions on the degradation efficiency of CQ were studied. It was found that CuO-N-PC-300 could not only catalyze the degradation of CQ but also remove 86.8 % of the phosphorus in the solution via electrostatic adsorption. Zeta potential analyses and molecular electrostatic potential calculations revealed that the electrostatic adsorption between the positively charged biochar and PO43− were the key factors for the recovery of phosphorus. Electrochemical analyses, quenching experiments, electron paramagnetic resonance (EPR) tests, and DFT calculations were employed to explore the potential activation mechanism of PMS. Both interfacial electron transfer and the Cu2+/Cu+ redox reaction were important pathways for activating PMS, generating a large number of •OH and 1O2 during the degradation of CQ. Finally, two degradation pathways of CQ were proposed based on LC-MS analysis, and the ecological toxicity was evaluated. This work provided an efficient method for the activation of PMS and the recovery of phosphorus by constructing positively charged nano-CuO sites on the surface of biochar.
9. 题目: Soil redistribution, weathering and soil organic carbon dynamics in a Mediterranean landscape
文章编号: N26010812
期刊: Catena
作者: Markus Egli, Annette den Boer, Mike C Rowley, Dmitry Tikhomirov, Maziar Mohammadi, Salvatore Raimondi
更新时间: 2026-01-08
摘要: Due to climate change and intense land use, soils are highly dynamic in Mediterranean regions. Soil redistribution rates (erosion/accumulation) are assumed to be the main factor changing soil evolutional trajectories, weathering and organic carbon dynamics in these landscapes, but their interactions remain poorly understood. Therefore, we investigated soil redistribution rates, weathering state, soil organic carbon dynamics and its chemistry in a Mediterranean area, Corleone, Sicily. Although the soils showed clear signs of degradation and erosion of up to 39 t ha−1 yr−1, as determined by 239+240Pu tracing, soil erosion measurement and modelling were made challenging by the vertic characteristics of some soils. With decreasing erosion rates, the soils had a higher amount of oxalate-extractable Fe stocks, more crystalline Fe, a lower (Ca + K)/Ti ratio (as a weathering indicator) or a higher CIA value. The organic C stocks ranged from 7 to 25 kg m−2 (average of 14 kg m−2). A major part of organic carbon was stored in the large aggregate fraction (≥63 μm). Soil organic carbon dynamics and quality were strongly linked to the soil redistribution rates. Erosion removed the strongly weathered part of the soil and left behind a younger and fresher soil matrix with a low org. C content, but an organic carbon fraction that was enriched in aliphatic chains and lignin-like compounds having a less mature status. The investigated soils had in general an optimal composition for stabilising and sequestering organic matter, even highly eroded and shallow soils still contained a considerable amount of org. C, which is untypical for Mediterranean areas.
10. 题目: Metabolomic responses of free-living diazotrophs inoculated on biochar
文章编号: N26010811
期刊: Journal of Environmental Chemical Engineering
作者: Xinyue Li, Yi Wang, Mohammad Bahram, Yiming Xian, Rong Huang, Leho Tedersoo, Changquan Wang, Bing Li
更新时间: 2026-01-08
摘要: The potential implications of biochar inoculated with nitrogen (N)-fixing bacteria for enhancing biological nitrogen fixation (BNF) efficiency have been recognized, while the interactions between different feedstock-derived biochar and inoculated strains remain largely unexplored. To examine biochar-induced changes in crucial metabolites and biological nitrogen fixation efficiency in N-fixing bacteria, we conducted a 91-day incubation experiment with diazotroph (Klebsiella sp.) inoculated on biochar produced from cattle manure, maize straw, and wood chips. We found that N-fixing bacteria resulted in the modification of the biochar surface by microbial metabolism and secretions. Compared to the sterilized biochar, the observed a reduction of 18.78 %–29.92 % in DOC content while an increase of 55.26 %–271.78 % in DON content in inoculated biochars point to direct microbial consumption of carbon and the retention of newly fixed nitrogen. After inoculation with diazotrophs, the H/C ratio of straw biochar increased by 13.97 %–51.16 % and 21.70 %–80.92 % relative to manure biochar and wood biochar, respectively. Additionally, straw biochar showed an increase in oxygen-containing functional groups (C-O-C, C
O) and consistently contained higher N and dissolved organic matter content during the incubation period, making it more accessible for microbial utilization. Biochar derived from different feedstocks significantly altered microbial metabolite profiles. Specifically, straw and manure biochar increased lipids and lipid-like molecules content, while straw biochar decreased aromatic compounds content in diazotrophs. Straw- and manure-derived biochar up-regulated N-containing metabolites within 35 days and conveyed N sufficiency. This study suggests that straw biochar may increase carbon availability, creating a microenvironment that modulate microbial metabolism and carbon-nitrogen balance, ultimately promoting diazotroph performance.
11. 题目: Enhanced deep dewaterability of EPS-rich Cyanobacterial sludge by modified biochar: performance and mechanism
文章编号: N26010810
期刊: Journal of Environmental Chemical Engineering
作者: Min Zhang, Fukang Zhu, He Liu, Hongbo Liu, Zhiyong Zheng, Zhongjun Chen
更新时间: 2026-01-08
摘要: The application of biochar in solid wastes dewatering has emerged as a promising technology and a deep understanding of the mechanisms is very essential. This study investigated the performance and mechanisms of enhanced EPS-rich Cyanobacterial sludge dewatering by iron-modified Cyanobacteria-based biochar (IMBC) and thermally modified IMBC (TMBC). The results demonstrated that IMBC reduced the capillary suction time (CST) of Cyanobacterial sludge by 90%, decreased specific resistance to filtration (SRF) by 19.5 times, and improved the Zeta potential from -15.7 mV to -1.0 mV, respectively. These improvements were attributed to a reduction in soluble extracellular polymeric substances (S-EPS) content and charge neutralization. TMBC-driven advanced oxidation process (AOP) reduced CST from 1651.7 s to 296.4 s and SRF by 88%, due to the efficient degradation of tightly bound EPS (TB-EPS). AOP converts TB-EPS to S-EPS, which weakens the dewatering performance. However, the addition of flocculants significantly enhances dewatering, demonstrating that TMBC-driven AOP effectively enhances the deep dewaterability of EPS-rich Cyanobacterial sludge by disrupting the intrinsic structural constraints that dominantly limit water release, while simultaneously inducing substantial organic matter release. The results provided novel insights of biochar enhanced Cyanobacterial sludge dewatering and the findings would benefit the future application of biochar in the EPS-rich organic waste dewatering.
12. 题目: DNDC-RF framework based regional soil organic carbon modeling and carbon sequestration potential prediction under climate and farm management scenarios
文章编号: N26010809
期刊: Applied Soil Ecology
作者: Yue Zhang, Zenghui Jia
更新时间: 2026-01-08
摘要: Context Accurate farmland soil organic carbon (SOC) modeling in space and time, and the prediction of its future carbon sequestration potential, can help improve soil quality, increase grain yield, and plan farm management strategies in response to climate changes. Research question Process-based models simulate soil carbon at the site scale, while the widely applied machine learning (ML) based digital soil mapping (DSM) techniques cannot incorporate the carbon cycle process on the land surface. Therefore, reliable monitoring of spatio-temporal SOC storage in agricultural soils remains constrained. Methods In this study, we collected 249 paired SOC observations under different farm managements from 35 published articles conducted in the Central Jilin Province of China during 1980–2004, to evaluate SOC simulation results from the DeNitrification-DeComposition (DNDC) model. Furthermore, a total of 1947 farmland SOC data (0–20 cm) was collected in 2005, 2010, 2015, 2020, and 2024. Twenty-one environmental variables including topography, climate, soil, parent material, vegetation, and farm management, were selected as the covariates for the random forest (RF) model. Then, the DNDC-RF framework was established by integrating the annual DNDC outputs (e.g., SOC and CO2) into the RF model, extending the site-scale simulations to the spatio-temporal dynamics of farmland SOC over the period of 2005–2024. Based on the DNDC-RF results, SOC sequestration potential was predicted under two future climate scenarios (RCP 4.5 and RCP 8.5) and diverse farm managements, spanning the period from 2025 to 2100. Four management categories were designed for these future SOC predictions, including tillage [no tillage (NT), reduced tillage (RT), and deep tillage (DT)], straw return (SR), manure fertilization (MF), and chemical fertilization (CF). Results and conclusions The DNDC-RF framework exhibited good prediction accuracies in the spatio-temporal SOC prediction, with relatively high R2 values (0.78, 0.75, 0.80, 0.85, and 0.79) and low root-mean-square error (RMSE) (1.15, 1.21, 1.09, 0.99, and 1.09 g kg−1) for the validation dataset in 2005, 2010, 2015, 2020, and 2024, respectively. Under different managements, MF and its related practices showed the highest increasing rates of SOC under future climate scenarios from 2025 to 2100. The highest increasing rate was observed under MF + CF + SR, with 1386–4999, 640–2099, and 494–1622 kg C ha−1 yr−1 for short-term (<3 y), mid-term (3–10 y), and long-term (>10 y) periods, respectively. Significance Our hybrid framework improved the spatio-temporal soil carbon mapping approach in terms of physical mechanism and spatial extension. These findings highlighted the importance of selecting optimal management strategies to enhance soil carbon sequestration to support future climate mitigation goals.
13. 题目: Mineral-associated organic nitrogen pool size, composition, and accessibility mediated by agricultural management and soil geochemical characteristics
文章编号: N26010808
期刊: Geoderma
作者: Gabriella M Griffen, Andrew H Whitaker, Emma L Bergh, Marian Carrell, Erik Knatvold, Aniko Konya, A Stuart Grandy, Andrea Jilling, Marco Keiluweit, Rachel Hestrin
更新时间: 2026-01-08
摘要: Mineral-associated organic matter (MAOM) contains a substantial portion of soil nitrogen (N). MAOM-N could serve as an important N source for crops, but its availability and response to agricultural management across different soil types remains largely unknown. We characterized MAOM-N isolated from nine paired soils spanning a range of geochemical characteristics and maintained under two land uses—more intensively managed annual cropping systems or less intensively managed grasslands. On average, we found that MAOM contained approximately two-thirds of total soil N. Across all soil types, more intensive agricultural management resulted in a 50% decline in MAOM-N stocks, as well as a reduction in MAOM-N molecular diversity. Although clay content and extractable metals were positively correlated with MAOM-N stocks, none of the geochemical characteristics measured were strongly predictive of MAOM-N decline due to land use. This suggests that more intensive crop management limited the formation or caused the disruption of a broad suite of associations between a variety of soil minerals and organic N compounds. Under both agricultural land uses, approximately 20% of MAOM-N was mobilized through sequential extractions that may mimic conditions in the rhizosphere, suggesting that a significant portion of MAOM-N may be available to plants. Together, these findings help to quantify MAOM’s potential to supply crops with N across different soil types and agricultural systems. This can inform agricultural management recommendations and supports a growing understanding of MAOM as a dynamic N source and sink.
14. 题目: Earthworm mediated microbial quorum sensing accelerates organic matter transformation during vermicomposting of dewatered sludge
文章编号: N26010807
期刊: Waste Management
作者: Jungang Ding, Tianzhen Guo, Hui Xia, Kui Huang, Mingte Li, Fusheng Li
更新时间: 2026-01-08
摘要: Vermicomposting (VC) relies on the synergistic interaction between earthworms and microorganisms to drive the degradation of organic matter (OM). Quorum sensing (QS), which governs earthworm-microorganism interactions, may influence dissolved organic matter (DOM) transformation during VC. However, the presence of QS and the functional roles of signaling molecules during VC remain unclear. This study investigated earthworm mediated microbial QS in driving microbial community succession and accelerating DOM transformation during VC, by contrasting the process without earthworms. The results showed that VC exhibited a distinct decomposition pathway, achieving significantly faster DOM degradation and mineralization (P < 0.01), compared to the control. Additionally, earthworms markedly facilitated the transformation of protein-like compounds into humic-like substances over a shorter period. Their presence also modified acyl-homoserine lactone (AHL) synthesis patterns and suppressed AHLs hydrolysis, resulting in a 96.14 % increase (P < 0.01) in short-chain AHLs. Metagenomic analysis revealed that earthworm in VC significantly altered the bacterial diversity (P < 0.05), enriching modularity coefficient and deterministic processes by 18.75 % and 87.03 %, respectively. Finally, AHL-responsive microorganisms significantly influencing physicochemical and DOM transformation during the VC. This study suggests that earthworms enhance AHL-type QS regulation in microbial communities, improving their metabolic functions and accelerating DOM transformation.
15. 题目: Timing and magnitude of the Lomagundi–Jatuli carbon isotope excursion
文章编号: N26010806
期刊: Proceedings of the National Academy of Sciences of the United States of America
作者: Stacey Edmonsond, Blake Dyer
更新时间: 2026-01-08
摘要: The rise of atmospheric oxygen during the Great Oxidation Event (GOE) (ca. 2.5 to 2.1 billion years ago) permanently transformed Earth’s biogeochemical cycles. The chemistry of contemporaneous marine carbonates provides a window into operation of the carbon cycle across this transition. Specifically, carbonate rocks co-eval with the GOE preserve a large and long-lived positive carbon isotope (
16. 题目: Elevation-Dependence Distribution and Dissolved Organic Matter (DOM)-Mediated Partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) in Peatland Waters from the Changbai Mountain Area
文章编号: N26010805
期刊: Environmental Research
作者: TeRi GeLe, Zucheng Wang, Hongkai Li, Zhaojun Bu, Shengzhong Wang, Shasha Liu, Ziping Liu, Zhiwei Xu
更新时间: 2026-01-08
摘要: The characteristics of polycyclic aromatic hydrocarbons (PAHs) in surface waters of seven peatlands were investigated along an elevation gradient in Northeast China. Particulate, freely dissolved, and DOM-associated PAHs, together with DOM optical indices were analyzed. The concentrations of total PAHs ranged from 16.75 to 307.38 ng·L-1, with dissolved PAHs generally outnumbering particulate PAHs at most sites. DOM-associated PAHs were more prevalent in high-elevation areas, while freely dissolved PAHs dominated in low- and medium-elevation regions. The logKd and logKOC values increased with PAH molecular weight, suggesting a stronger affinity of heavier compounds for particles. The proportion of DOM-associated PAHs correlated positively with DOM molecular weight and aromaticity indices (E2: E3, SUVA254 and C:C) (p < 0.05), indicating that the quality of DOM, rather than its quantity, plays a crucial role in PAH binding. Diagnostic ratios and principal component analysis (PCA) revealed mixed pyrogenic and petrogenic sources. Further spatial analysis revealed regional atmospheric inputs at high-elevation sites, and high concentrations at the low-elevation JC from local anthropogenic emissions. Ecological risk assessment indicated moderate contamination levels and potential ecological risks, primarily from freely dissolved PAHs like fluoranthene and phenanthrene. Although total PAH concentrations were relatively moderate globally, the high bioavailability of the dissolved fraction raises localized ecological concerns. Overall, DOM aromaticity strongly affects the phase partitioning, transport, and persistence of PAHs in peatland waters along elevation gradients.
17. 题目: Achieving cleaner resource recovery by adding biochar into MSWI fly ash/coal fly ash-based cementitious materials: immobilization capacity, hydration mechanism, and carbon sequestration potential
文章编号: N26010804
期刊: Journal of Environmental Chemical Engineering
作者: Tong Zhao, Siqi Zhang, Huifen Yang, Guocui Li, Zeping Wu, Wen Ni
更新时间: 2026-01-08
摘要: Addressing the issues of low strength, high risk of heavy metal/anion release, and low hydration activity associated with MSWI fly ash (FA)–coal FA-based composite cementitious materials (CMM), this study innovatively obtained BC-enhanced CMM (CMBM), revealing BC's synergistic effects on hydration, immobilization, and carbon sequestration. Research shows that 10 wt% (by mass) of BC increases the gel pore ratio (<10 nm), improves the compressive strength (9.47 MPa, 28d) and initial water absorption rate (9.79×10-3 mm/s1/2) and of CMBM. Adding 10 wt% (by mass) of BC can reduce the release concentration of As, Cr, Zn, Pb, SO42– and Cl– in CMBM. The immobilization enhancement mechanism influenced by BC involves promoting the adsorption of Pb2+, PbOH+, Zn2+, and ZnOH+ by 
Si–OH/Si–O–Si–OH sites within the C–(A)–S–H gel, and simultaneously promoting the conversion of As, Cr, Zn, and Pb into residuals. The carbon sequestration mechanism involves adding 10 wt% (by mass) of BC increases CO2 capture and promotes the formation of calcite/vaterite (size: 100 nm to 200 nm). The hydration mechanism influenced by BC includes: 1) Promoting the continuous increase in Al[VI] content in Ettringite/Friedel salt and the continuous increase in the relative proportion of Si–O–Si (Q2(1Al), Q2) in C–(A)–S–H gel by regulating the soluble Cl content. 2) Provides more crystallization nucleation sites. 3) Promotes CO2 capture and generates multiple carbonate crystal phases. This work provides theoretical support for waste utilization and pollution control.
18. 题目: Wetland degradation changes the sensitivity of soil organic carbon components to exogenous nutrient inputs
文章编号: N26010803
期刊: Plant and Soil
作者: Wei Zhang, Tiejun Song, Xiaosi Su, Weihong Dong, Shuiduo Yu
更新时间: 2026-01-08
摘要: Background and aims Anthropogenic activities induce exogenous nitrogen (N) and phosphorus (P) inputs that can affect wetland soil properties, plant biomass, and ecoenzyme activities, thereby regulating soil carbon (C) cycling. However, currently, the changes and sensitivity of soil organic C components to exogenous nutrient inputs during wetland degradation are poorly understood. Methods We analyzed changes in soil organic C components in non-degraded and degraded wetlands in the Songnen Plain under N, P, and N + P inputs and used analyses of variance, correlation analysis, redundancy analysis, and structural equation modeling to explore the mediating mechanisms of soil properties, plant biomass, and ecoenzyme activities on soil organic C components. Results Soil properties, plant biomass, ecoenzyme activities, and soil organic C components were mainly affected by N input in non-degraded wetlands and by N and P inputs in degraded wetlands. Redundancy analysis revealed that soil properties, plant biomass, and ecoenzyme activities explained 85.2%, 42.4%, and 42.8% of the variations in soil organic C components under nutrient inputs, respectively. Further, structural equation model revealed N and P inputs directly affected soil organic C components by altering soil total N, total P, and water content, or indirectly by altering plant biomass and ecoenzyme activities. Conclusions Wetland degradation can increase the sensitivity of soil organic C components to nutrient input. This response process is primarily driven by soil properties, although plant biomass and ecoenzyme activities also play important regulatory roles. These findings are crucial for protecting wetland soil C pools and mitigating global climate change.
19. 题目: Long-term reclamation enhances soil organic carbon accumulation via mitigating salinity and alkalinity in coastal saline soils
文章编号: N26010802
期刊: Agriculture, Ecosystems & Environment
作者: Wei Zhu, Shiguo Gu, Xin Zhang, Xuan Yu, Shuanghuang Yu, Xiangping Wang, Rui Jiang, Xiangtian Meng, Rongjiang Yao
更新时间: 2026-01-08
摘要: Coastal saline soil reclamation is critical for global food security, with soil organic carbon (SOC) accumulation being central to rehabilitation. However, the characteristics of SOC under different saline-alkali levels corresponding to various reclamation ages with in-situ crop straw incorporation, and its key components, plant residue carbon (PRC) and microbial necromass carbon (MNC) remain unclear. Using a chronosequence of reclamation durations (0, 3, 5, and 8 years) in Dongtai reclamation area, China, we measured SOC, soil nutrients, enzyme activities, and microbial biomass. Reclamation progressively reduced soil electrical conductivity (EC), while pH declined more gradually. The accumulation of PRC and MNC lagged behind the reduction of EC and pH, following curvilinear patterns. By year 8, SOC in the 0–15 cm and 15–30 cm layers reached 6.30 g kg⁻1 and 6.37 g kg⁻1, representing 62 % and 120 % increases from the year 0, while PRC increased by approximately 500 % in both layers. Fungal necromass carbon (FNC) dominated MNC pool, with FNC/BNC (bacterial necromass carbon) ratios of 7.48 (0–15 cm) and 6.52 (15–30 cm) at year 8, respectively. EC and pH decreased, thus affect enzyme activities and soil nutrients, and SOC sequestration was ultimately promoted. Therefore, long-term reclamation (> 8 years) enhances desalination and SOC storage, substantial SOC gains occur only once soils become non-salinized (EC1:5 < 1 dS m⁻1, pH < 8.5), underscoring EC and pH control as prerequisites for stable SOC sequestration.
20. 题目: Effects of Farmland Scale on Soil Organic Matter Change in Black Soil Areas of China in the Past 40 Years
文章编号: N26010801
期刊: Land Degradation & Development
作者: Yu Zhang, Chong Luo, Yuxin Ma, Depiao Kong, Yihao Wang, Wenqi Zhang, Huanjun Liu
更新时间: 2026-01-08
摘要: Differences in farmland scale led to variations in agricultural practices and management, which in turn influence the direction and rate of changes in soil organic matter (SOM). This study collected 574 topsoil samples (0–20 cm) from the Youyi Farm in a typical black soil region of Northeast China. Cloud‐free Landsat images from 1984 to 2023 were obtained via Google Earth Engine and bare soil images were synthesized in 10‐year intervals. The study area was classified using the K‐means clustering algorithm to construct a two‐cluster probabilistic hybrid model, enhancing the accuracy of SOM predictions. Finally, SOM spatial distribution data were obtained for each 10‐year period to evaluate the impact of different farmland scales on SOM variation. The results showed that: (1) using a probabilistic hybrid model effectively improved the prediction performance of SOM, with