论文检索

总访问量：5299380次

总访客量：305555人

所有论文

1. 题目: Mechanistic insights into nZVI-enhanced denitrification resilience in biological aerated filters under chlorfenapyr stress: Roles of EPS stability and electron-transfer pathways
文章编号: N26060712
期刊: Water Research
作者: Liangjie Li, Jiawei Jiang, Yufan Liu, Zhilin Xing, Tiantao Zhao
更新时间: 2026-06-07
摘要: To address the decline in nitrogen removal performance of biological aerated filters (BAFs) caused by the inhibition of key denitrification processes by the arylpyrrole insecticide chlorfenapyr, this study established a nanoscale zero-valent iron (nZVI)-enhanced BAF system and systematically investigated the enhancement effects and regulatory mechanisms of nZVI. The results demonstrated that nZVI markedly improved shock load resistance and recovery resilience. The NH4+-N removal efficiency remained above 90% under different chlorfenapyr concentrations, while the total nitrogen (TN) removal efficiency reached up to 88.82%. Extracellular polymeric substance (EPS) analysis indicated that nZVI effectively mitigated the adverse effects of stress on the surface properties of the biofilm, maintaining the protein-to-polysaccharide ratio at approximately 2.0 and thereby preserving biofilm structural stability. High-throughput sequencing revealed that nZVI sustained microbial community diversity and evenness. The relative abundance of the dominant phylum Pseudomonadota consistently remained above 54%, and the targeted enrichment of functional genera such as Paracoccus and members of Rhizobiaceae was promoted. Integrated analysis of carbon and nitrogen metabolic pathways had revealed that nZVI, acting as an electron donor, had promoted the TCA cycle while significantly upregulating the expression of iron transport genes (afuABC) and key denitrification genes (napA, nirB, and nosZ). From the perspectives of electron transfer and microbial community ecology, this study elucidates the intrinsic mechanisms by which nZVI enhances the stress resistance of biological systems, providing a theoretical basis for the engineering treatment of refractory pesticide wastewater.

2. 题目: Cooperation between cellulose-degrading complex microflora and enzymes on improving soil organic carbon turnover and stabilization in the saline-alkali soils
文章编号: N26060711
期刊: Applied Soil Ecology
作者: Sainan Gao, Xuelian Liu, Chong Wang, Haoyue Qin, Honghao Cheng, Xueya Liu, Mengli Liu
更新时间: 2026-06-07
摘要: Straw incorporation is a popular practice for enhancing soil organic carbon (SOC). However, the severe environmental characteristics of saline-alkali soils suppress microbial activity and extracellular enzyme production, thereby constraining the transformation and stabilization of straw-derived carbon into SOC. The application of straw-degrading microorganisms or hydrolytic enzymes can substantially accelerate straw decomposition. This research was conducted to study the synergistic cooperation between cellulose-degrading complex microflora and enzymes on the transformation of straw carbon into SOC in saline soil. Results indicated that enzymatic significantly increased the cellulose and hemicellulose decomposition at 30 days, while the complex microflora significantly enhanced overall straw decomposition and substantially increased SOC content at 60 days by promoting the decomposition of cellulose, hemicellulose and lignin in saline soils. These results suggested that complex enzymes primarily function during the early stages, whereas complex microflora exert their effects predominantly during the later stages. During the early stages, the synergistic application of cellulose-degrading complex microflora and enzymes increased Ascomycota abundance and genes associated with labile carbon degradation, thereby enhancing the efficiency of straw-derived carbon conversion into SOC. In the later stages, the synergistic effects promoted the conversion of particulate organic carbon (POC) to mineral-associated organic carbon (MAOC) by increasing Basidiomycota abundance and genes associated with recalcitrant carbon degradation. Overall, this study demonstrates a temporally coordinated cooperation between complex microflora and enzymes on the regulation of SOC turnover and stabilization in saline-alkali soils.

3. 题目: Fungal necromass carbon mediates soil organic carbon under film mulch regimes in a potato cropping system
文章编号: N26060710
期刊: Applied Soil Ecology
作者: Mei Zhang, Furong Du, Ke Li, Mingming Zhao, Xinyan Hu, Xiaoguang Chen
更新时间: 2026-06-07
摘要: Microbial necromass carbon (MNC) is an important component of soil organic carbon (SOC). While film mulch is known to influence the accumulation of SOC, the microbial processes by which different mulch regimes regulate SOC via MNC remain poorly understood. This study aimed to elucidate how different film mulch regimes influence SOC accumulation, MNC content, and microbial community characteristics in a potato cropping system. We conducted a 2-year field experiment in the Huang-Huai-Hai Plain of China under five treatments: non-mulch film (non-mulch), black film (black), black film & shed film (black+shed), white film (white), and white film & shed film (white+shed). 16S and ITS rRNA amplicon sequencing and amino sugar biomarker analyses were used to assess the changes in the soil microbial communities, extracellular enzymes, fungal (FNC) and bacterial necromass carbon (BNC). Compared to the other treatments, the white treatment considerably increased SOC content, accompanied by the highest MNC and FNC (p < 0.05). Notably, FNC contributed an average of 17.1% to SOC, far exceeding the 1.9% contribution from BNC (p < 0.05), indicating that FNC played a more crucial role than BNC in promoting SOC accumulation. Variations in soil available nutrients (N, P) and N-acquiring enzymes primarily shaped microbial community composition, particularly altering the abundance of Firmicutes and Ascomycota, which largely facilitated the accumulation of FNC. These findings highlight the key role of FNC in SOC sequestration and identify white film mulch is the optimal practice to enhance the accumulation of SOC.

4. 题目: Impact of management intensity of agricultural systems and soil intrinsic characteristics on soil organic carbon stocks
文章编号: N26060709
期刊: Agriculture, Ecosystems & Environment
作者: Alex Castellón Meyrat, Lilian O’Sullivan, Paul Holloway, David Wall, Giulia Bondi
更新时间: 2026-06-07
摘要: Enhancing carbon in soils is crucial for improving soil health and building sustainable agroecosystems. Inherent SOC stocks are site-specific and vary due to complex interactions between climate, soils, land use, and management practices. However, the coupled effects of these factors on SOC dynamics are not fully understood. This research aimed to evaluate the impact of different management regimes and intrinsic soil characteristics on SOC stocks and identify pathways that can boost carbon sequestration in agricultural soils. This study relied on data of 143 soil profiles distributed across the south of Ireland. Each site was sampled at four depths (0–15, 15–30, 30–45, and 45–60 cm) and characterized according to the land use and management practices implemented over the past five years. A Regression Tree (RT) model was employed to estimate the single and combined contribution of key soil properties and management practices on SOC stocks. Overall, intrinsic soil characteristics, especially the presence of humic layers and clay, are decisive to determine the SOC storage potential in soils. Land use and management practices primarily impact the top 15 cm, and their accumulated effect (e.g. stocking rates in grassland systems) can shift SOC stocks trends over time. Finally, the heterogeneity in subsoils controls the variability of SOC stocks in depth. The outcomes of this study can help tailor carbon farming strategies to boost carbon sequestration accounting for specific soil conditions.

5. 题目: Fungal residue dominates soil organic carbon accumulation during vegetation restoration
文章编号: N26060708
期刊: Catena
作者: Shu Zhu, Jiwei Li, Zhenhao Wei, JianZhao Wu, Ziyuan Liu, Zhouping Shangguan, Lei Deng
更新时间: 2026-06-07
摘要: Microbial residue carbon (MRC) plays a critical role in soil carbon cycling and stabilization under global climate change. However, how vegetation restoration affects MRC accumulation remains unclear. In this study, we compiled 817 field observations to investigate the effects of vegetation restoration on MRC accumulation at a global scale. The results showed that vegetation restoration increased MRC, fungal residue carbon (FRC), and bacterial residue carbon (BRC) by 39.9%, 46.6%, and 34.3%, respectively, while the FRC/BRC ratio remained relatively stable. Vegetation restoration enhanced the contribution of FRC to soil organic carbon by 8.3%, highlighting its crucial role in carbon stabilization. Grassland restoration led to a greater increase in MRC (+52.1%) compared with natural succession (+36.6%) and afforestation (+24.8%). In addition, vegetation restoration in arid regions led to larger increases in both MRC (+44.1%) and FRC (+57.6%) than in humid regions (+35.3%, +35.2%, respectively). Collectively, our results reveal that fungal residues played a key role in soil organic carbon accumulation, which is primarily regulated by soil pH, the fungal-to-bacterial ratio, and nutrient availability following vegetation restoration. These findings clarify how soil pH regulates fungal pathways to facilitate carbon sequestration during vegetation restoration.

6. 题目: Biochar increased water productivity and grain yield of winter wheat by alleviating post-anthesis drought stress under limited irrigation
文章编号: N26060707
期刊: Agricultural Water Management
作者: Ying Liu, Zhen Gao, Wanshun Li, Yanfei Liu, Teng Fei, Xudong Zhao, Wenchao Zhen, Jianhong Ren
更新时间: 2026-06-07
摘要: Post-anthesis drought is the main limited factor for winter wheat production under limited irrigation in the North China Plain (NCP). Application of biochar has been demonstrated as an effective measure to alleviate water deficit stress. Therefore, a field experiment was conducted at the Xinji Experimental Station, Hebei, China, over the two wheat growing seasons (2023–2024 and 2024–2025) to clarify the combined effects of irrigation and biochar on soil-root-canopy traits. The main plots consisted two limited irrigation regimes, i.e., W1 (75 mm irrigation at the jointing stage) and W2 (75 mm irrigation at the jointing and anthesis stage, respectively); sub-plots included four biochar application rates, i.e., 0, 3, 6, and 9 t ha−1 (B0, B3, B6, and B9). Biochar reduced soil bulk density but significantly increased field water capacity, which increased the root length density and root surface area density in the topsoil layer. During the grain filling stage, biochar (B3 and B6) sustained high SPAD values and relative water content in flag leaves. It also significantly alleviated leaf senescence (as evidenced by higher SOD and lower MDA) and increased photosynthesis rate. Accordingly, starch content in spikes and post-anthesis dry matter accumulation both increased. Additionally, when soil moisture was relatively sufficient (W2 and W1 in rainy 2024), the application of biochar resulted in higher water use. W2B3 showed the most significant yield increase, with a 9.2%-10.5% increase compared to W2B0, while W1B6 showed the most significant yield increase, with a 5.4%-8.7% increase compared with W1B0. Averaged across two seasons, biochar application significantly enhanced water productivity by 2.0%-4.5%. We concluded that moderate biochar could effectively optimize soil and root properties, mitigate leaf senescence and increase grain yield of winter wheat under limited irrigation in the NCP.

7. 题目: Extracellular polymeric substances reprogram the environmental behavior and impact of silver nanoparticles on Chlamydomonas reinhardtii
文章编号: N26060706
期刊: Environmental Pollution
作者: Rocco Gasco, Arin Kantarciyan, Vera I Slaveykova
更新时间: 2026-06-07
摘要: Engineered nanoparticles, and silver nanoparticles (nAg) among them, can be released into aquatic environments, where interactions with natural biomolecules can significantly alter their environmental behaviour and toxicity. Recognizing the growing need to integrate ecocorona processes into nanoparticle risk assessment, this study investigates extracellular polymeric substances (EPS) from green alga Chlamydomonas reinhardtii as key environmental modulators of nAg transformations and biological effects. The behaviour of citrate-coated (Cit-nAg) and lipoic acid-coated (Lip-nAg) nanoparticles in the presence and absence of environmentally relevant concentrations of algal EPS was evaluated through combined physicochemical characterization and ecotoxicological assays to assess EPS-driven changes in aggregation dynamics, dissolution behaviour, and toxicity toward freshwater phytoplankton. EPS adsorption markedly reshaped nAg behaviour in a coating-dependent manner: while EPS enhanced colloidal stability for both materials, it reduced Ag+ release and toxicity for Cit-nAg, but promoted dissolution and amplified biological effects for Lip-nAg, showing the potential dual role of phytoplankton EPS in shaping nAg identity in freshwater. These results reveal that EPS-driven ecocorona formation can either mitigate or enhance nAg toxicity depending on the underlying surface chemistry. By demonstrating how environmentally derived biomolecules regulate the coupling between nanoparticle transformations and toxicological responses, this study supports the critical role of ecocorona formation as a central component in environmentally realistic assessments of nanomaterial fate and risk.

8. 题目: Per- and polyfluoroalkyl substances (PFASs) in humus-mineral layers of forest soils: Distribution, key drivers, and leaching rates
文章编号: N26060705
期刊: Environmental Research
作者: Ying Liu, Weijie Liu, Yili Zou, Andrew J Sweetman, Yao Mao, Tianpeng Hu, Jiaquan Zhang, Shihua Qi, Xinli Xing
更新时间: 2026-06-07
摘要: The toxicity and persistence of per- and polyfluoroalkyl substances (PFASs) have made their widespread environmental contamination a significant global issue. Forests can uptake and trap PFASs from the atmosphere, but their environmental behavior and fate in forest humus layer and mineral soil remain unclear. This study investigated PFAS distribution, drivers, and leaching rates in Mt. Shennongjia, China. The concentrations of total PFASs (Σ24PFAS) in the humus layer (average of 5.67 ng/g) were higher than in mineral soil (2.79 ng/g), with long-chain perfluoroalkyl carboxylic acids (PFCAs) (46.8%-59.3%) being the predominant PFASs. Spatial distribution and correlation analysis indicates that, altitude and forest vegetation types influence the accumulation of PFASs in forest humus and soil. The concentration of PFASs generally increased with increasing altitude, and the sub-alpine conifer forest exhibited higher PFASs level than other vegetation types. The concentration of PFASs was positively correlated with the TOC content (r = 0.356-0.745, p < 0.05). Enrichment factors (EF) of PFAS varied from 0.14 to 2.22, and EFs decreased with increasing carbon chain length, suggesting long-chain PFASs have a greater propensity to partition into humus. The leaching rates of PFAS from the humus layer in freely dissolved forms were significantly higher than those in the dissolved organic matter forms (p < 0.05). Short-chain and carboxylate-headed PFASs showed greater downward leaching potential, more attention should be paid to their transport to groundwater in ecologically sensitive areas.

9. 题目: Long-term operated constructed wetlands: High organic carbon storage and autochthonous carbon dominance
文章编号: N26060704
期刊: Bioresource Technology
作者: Guosheng Zhang, Qingju Hao, Jiawei Ren, Yuhang He, Xiaoran Peng, Kesong Pu, Biqin Hu, Changsheng Jiang
更新时间: 2026-06-07
摘要: Constructed wetlands (CWs) are engineered landscapes designed to replicate the functions of natural wetlands, serving as substantial sinks for sediment organic carbon (SOC). However, the seasonal dynamics of SOC composition and dissolved organic matter (DOM) characteristics, as well as their roles in autochthonous carbon cycling, remain poorly understood. This study investigated a typical long-term (over 13 years) operated CW in Chongqing, China, to elucidate the seasonal variations of sediment particulate organic carbon (POC) and mineral-associated organic carbon (MAOC). By integrating ultraviolet–visible spectroscopy, three-dimensional fluorescence spectroscopy, and microbial sequencing, we explored the relationships among DOM characteristics, greenhouse gas (GHG) emissions, and microbial communities. The results indicated that the CW sediments exhibited high SOC accumulation, which was dominated by MAOC (averaging 61.5% of SOC). MAOC exhibited significant seasonal fluctuations, reaching a minimum in autumn (96.9 ± 27.1 g·kg−1) and peaking in winter (130.3 ± 17.6 g·kg−1), whereas POC remained relatively stable. Spatial SOC variations were driven by plant species, with zones dominated by fibrous-rooted Hydrocotyle vulgaris accumulating higher levels than those with Acorus calamus. DOM primarily consisted of protein-like components (averaging a 69.4% contribution), exhibiting strong autochthonous characteristics and a low degree of humification. CO2 was the dominant GHG emitted from sediment, and its emissions correlated strongly with protein-like DOM. The microbial communities displayed significant seasonal shifts, exhibiting higher relative abundances of denitrifying genera (e.g., Dechloromonas) in winter than in summer. These findings highlight the seasonal dynamics of MAOC as a critical regulator for carbon storage and turnover in CWs, offering insights into sediment organic matter stabilization within engineered landscapes.

10. 题目: Changing pH, organic matter, and redox state govern contaminant mobility during waste stabilization in landfill simulation reactors
文章编号: N26060703
期刊: Journal of Hazardous Materials
作者: Nick Quist, Frank van Raffe, Joris J Dijkstra, Rob N J Comans
更新时间: 2026-06-07
摘要: Landfills remain an important endpoint for waste and waste residues, yet current management in the Netherlands requires eternal aftercare to protect public health and the environment. Enhanced waste stabilization in landfills through active treatment, i.e. aeration and leachate recirculation, has potential as a sustainable alternative to current landfill management. However, the influence of active treatment on solid waste properties and subsequent leaching of hazardous contaminants has only received limited investigation. This study investigates these influences in landfill simulation reactors containing 30kg of waste from different origins, which were treated using aeration, leachate recirculation, and their combination. Large differences in leachate contaminant concentrations were found between treatments. A shift from leachate recirculation to aeration changed prevailing redox conditions from anaerobic to aerobic and decreased pH and dissolved organic and inorganic carbon. Consequently, concentrations of ammonium and inorganic contaminants with a high organic matter binding affinity decreased, whereas other inorganic contaminants first increased in concentration due to mineral dissolution followed by a decrease due to mineral precipitation or binding to reactive surfaces. The underlying mechanisms of these trends were identified based on geochemical modelling. The observed changes during aeration were accelerated when aeration was preceded by leachate recirculation, and concentrations rebounded when anaerobic conditions were reintroduced. Our findings ultimately demonstrate that active treatment of landfills requires careful consideration of the most effective strategy, as trade-offs in contaminant leaching mean their potential risks should be weighed against each other.

11. 题目: Hydrologically driven apparent photosynthetic aging effect in karst aquatic ecosystems and its implications for aquatic carbon cycling
文章编号: N26060702
期刊: Journal of Hydrology
作者: Dong Li, Hailong Zhang, Zaihua Liu, Min Zhao, Qian Bao, Meixun Zhao
更新时间: 2026-06-07
摘要: Land use changes alter water–rock interactions and residence times by modifying soil CO2 production and infiltration, thereby affecting the karst groundwater 14C age of dissolved inorganic carbon (DIC). Through a controlled experiment with different land-use types (bare rock, bare soil, cropland, grassland, shrubland) at a karst simulated test site in SW China, we measured the δ13C and Δ14C of DIC, aquatic plants, particulate organic carbon (POC), dissolved organic carbon (DOC), and sediments. Groundwater DIC Δ14C ranged from –284‰ (bare soil) to –106‰ (grassland), corresponding to14C ages of ∼900–2400 years before present. The 14C isotopic composition of all other measured carbon also showed an old signature, ranging from –100 to –300‰. Aquatic plant Δ14C showed a near 1:1 correlation with DIC Δ14C (r2 = 0.96), demonstrating the direct transfer of aged DIC into autochthonous organic matter (Auto-OM)—a phenomenon we term the “apparent photosynthetic aging effect”. Quantitative modeling showed that incorporation of this aged Auto-OM shifts bulk POC Δ14C by –48% to + 51% and DOC Δ14C by –982% to 0% relative to global median values. For sediment14C dating, using aquatic materials yields ages ∼ 800–2800 years older than the true ages. A quantitative hydrological framework linking land use → recharge → DIC age → photosynthetic aging → biogeochemical impacts is established. We conclude that the apparent photosynthetic aging effect is a hydrologically driven process that fundamentally alters the radiocarbon baseline of karst aquatic ecosystems, with significant implications for carbon source tracing, food web studies, and sediment dating.

12. 题目: Soil microbial communities and reactive oxygen species reshape MAOC-driven PAH accumulation under seasonal trade-offs between forest filtering and cold trapping
文章编号: N26060701
期刊: Journal of Hazardous Materials
作者: Weijie Liu, Xinli Xing, Ying Liu, Andrew J Sweetman, Kevin C Jones, Shizhen Zhao, Yanqi Ma, Yichen Lu, Qinglong Fu, Tianpeng Hu, Jiaquan Zhang, Shihua Qi
更新时间: 2026-06-07
摘要: Current understanding of the accumulation of polycyclic aromatic hydrocarbons (PAHs) in terrestrial ecosystems suggests that soil organic carbon (SOC) dynamics is a key regulator, including particulate- (POC) and mineral-associated (MAOC) organic carbon. This creates possible ‘competition’ between soil POC and MAOC for the accumulation of PAHs. However, it remains unclear to what extent seasonal SOC pool dynamics modulate the balance between cold trapping and forest filtering, especially through microscale processes linked to soil microbial communities and redox conditions. Here, we investigate the altitudinal and seasonal dependence of PAHs, SOC pools, soil properties, reactive oxygen species (ROS), and microbial communities in forest soils. Significant seasonal difference in the altitudinal pattern (spring: r = -0.68, p < 0.0001; autumn: r = 0.624, p < 0.0001) of PAHs in soils, together with relationships with altitude, logKow, and the humus/mineral-soil ratio, suggests a greater contribution from forest filtering to the springtime soil PAH concentrations and a stronger influence of cold trapping in autumn. Forest filtering increases soil PAHs concentrations and POC formation in the humus layer, but constrains MAOC accumulation. Nevertheless, the cold trapping effect promotes soil MAOC pools in autumn, thereby increasing soil PAHs concentrations. These patterns are primarily driven by the seasonal reorganization of soil physicochemical properties and microbial communities, thereby facilitating the transformation of ROS and SOC pools. Overall, these results advance our understanding of how SOC fraction dynamics, soil properties, and microbial communities jointly regulate global PAHs accumulation under a changing climate.

13. 题目: Seasonal and spatial dynamics of greenhouse gases and organic carbon in peatland pools of western Siberia
文章编号: N26060617
期刊: Catena
作者: Bogdan A Mikhaleiko, Yuri Ya. Kolesnichenko, Danil G Kurashev, Uliana Yu. Shavrina, Artem G Lim, Rinat M Manasypov, Larisa G Kolesnichenko, Tatiana V Raudina, Sergey N Kirpotin, Sergey N Vorobyev, Oleg S Pokrovsky
更新时间: 2026-06-06
摘要: Aquatic components of Siberian peatlands—lakes, pools, and ephemeral puddles—remain far less studied than their terrestrial counterparts due to their remoteness and the logistical challenges of accessing mire interiors. To improve understanding of seasonal greenhouse gas (GHG; CO2 and CH4) dynamics and dissolved organic carbon (DOC), we investigated ∼20 waterbodies ranging in size from small puddles to large lakes within a remote ridge–hollow–lake complex of the Great Vasyugan Mire (GVM), the world’s largest peatland. Sampling encompassed four contrasting seasons, including winter under complete ice cover. Hydrochemistry and GHG fluxes of peatland pools and lakes showed strong size dependence. Small dystrophic pools exhibited elevated CO2, CH4, DOC, and nutrient concentrations, reflecting shallow subsurface inputs and strong soil–water coupling, whereas larger lakes showed lower DOC aromaticity and higher pH, consistent with greater autochthonous production and groundwater influence. Although the smallest waterbodies exhibited the highest specific CO2 and CH4 fluxes, their limited surface area restricted their contribution to total emissions, whereas mid-sized and large lakes dominated the mire-scale carbon budget because of their much greater areal extent. Winter conditions primarily promoted under-ice accumulation of dissolved gases, indicating strong carbon storage beneath the ice and high release potential upon ice disruption; these measurements should not be interpreted as steady-state diffusive fluxes through intact ice. Because the immediate late-April ice-breakup pulse was not captured and CH₄ estimates included only the diffusive pathway, the annual aquatic carbon budget represents a conservative minimum estimate. Even so, aquatic carbon losses from pools and lakes of the GVM are on the same order as regional peat accumulation and exceed riverine DOC export. These results highlight the essential role of peatland aquatic systems—and especially under-ice accumulation, ice-off release, and unmeasured ebullition—in shaping high-latitude carbon budgets.

14. 题目: Dynamic changes of dissolved organic matter chemical properties and compositions with salinity gradients in saline and hypersaline lakes in the Qiangtang Plateau
文章编号: N26060616
期刊: Journal of Hydrology
作者: Yaoling Zhang, Xin Liu, Hongmei Chen, Qingkuan Li, Haitao Feng, Hao Wang, Jiaqi Chen, Wu Li, Keli Yang
更新时间: 2026-06-06
摘要: Lakes distributed in the Tibetan Plateau (TP) vary greatly in salinities and are undergoing rapid changes of hydrologic features and allochthonous input under the influence of climate change. However, how these changes will impact the biogeochemical cycle of natural dissolved organic matter (DOM) in the TP lakes, especially saline and hypersaline lakes with different salinities remains unclear. In this study, DOM obtained from forty-five saline and hypersaline lakes and two freshwater lakes in the Qiangtang Plateau of the TP were investigated to evaluate links between DOM compositions and salinity variations. Spectral characteristics and molecular compositions of DOM were analyzed by ultraviolet–visible absorbance (UV–Vis), fluorescence excitation-emission matrices (EEMs), and ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). Results showed a dominant microbial and autochthonous source of DOM in most of the saline and hypersaline lakes. Along the salinity gradient, lacustrine DOM concentrations increased, whereas average molecular weight decreased and autochthonous characteristics became more pronounced. In addition, higher salinity was associated with a greater proportion of heteroatom-containing molecules, especially sulfur-containing compounds. These salinity-related changes in lacustrine DOM likely result from the combined effects of evapoconcentration, photodegradation, microbial processing, and flocculation. This study highlights how salinity and environmental factors may influence the quantity and chemical properties of DOM and thus to better understand the transformation and cycling of DOM with varying salinities in the TP lakes under the context of global climate warming.

15. 题目: Plant carbon inputs drive the stratification of soil organic carbon, microbial biomass and mineralizable nitrogen after reducing soil tillage
文章编号: N26060615
期刊: Geoderma
作者: Bruno Mary, Fabien Ferchaud, Hugues Clivot, Hubert Boizard, Bernard Nicolardot
更新时间: 2026-06-06
摘要: The impact of tillage on the stocks of soil organic carbon (SOC), soil total nitrogen (STN), microbial biomass carbon (MBC), and on nitrogen mineralization rates (NMR) remains a subject of debate. In a field experiment with loamy soil and a temperate climate, we compared three cropping systems and two tillage treatments (conventional and shallow tillage). Bulk density, SOC, STN and MBC were measured in three soil layers (0–6, 6–20 and 20–30 cm) and at four dates (1.5, 3.5, 5.5 and 7.5 years after the shallow tillage was implemented). NMR was measured in laboratory incubations at two dates (1.5 and 7.5 years). SOC stocks under shallow tillage increased at a rate of 0.25 t ha−1 yr−1 in the upper soil layer, but decreased at a rate of −0.20 t ha−1 yr−1 in the deeper layer, whereas stocks under conventional tillage remained almost stable in the three layers. The same pattern was observed for STN and MBC. Similarly, NMR under shallow tillage increased significantly in the upper layer (+35%), while decreasing in the deeper layer (−25%). However, neither cropping systems nor tillage treatments affected the total SOC, STN and MBC stocks or NMR when integrated over the entire profile (∼0–30 cm). The rates of change in SOC, STN, MBC and NMR in the three soil layers were highly correlated with estimated plant carbon inputs based on crop yields, but not with tillage intensity. These results challenge the hypothesis of a higher physical protection of the soil organic matter with reduced tillage.

16. 题目: Fe-carbon-microbe coupling mediated CO₂ emission enhancement by dissolved black carbon in riparian soils
文章编号: N26060614
期刊: Soil and Tillage Research
作者: Yushu Yang, Zhenchen Li, Xiaoyun Li, Hongyi Wang, Li Gu, Hong Cheng, Binquan Jiao, Weiliang Pan
更新时间: 2026-06-06
摘要: Global climate change has triggered a significant increase in the frequency of wildfire occurrences. Specifically, wildfires led to substantial inputs of thermally derived by-products from incomplete combustion—such as dissolved black carbon (DBC)—into the soil environment through atmospheric deposition. To explore the effects of DBC on iron (Fe) cycling, reactive oxygen species (ROS) generation, and greenhouse gas emissions in riparian soils, this study conducted a simulation of 42-day natural redox fluctuation conditions. The results indicated that DBC significantly promoted the reduction of FeIII and accelerated the emissions of CH₄ and CO₂, and these effects might be driven by the following mechanisms: DBC served as an efficient electron shuttle, which facilitated the redox transformation of Fe species; during the aerobic stage, it promoted the generation of •OH, and this radical improved the bioavailability of recalcitrant organic matter via cleavage reactions; meanwhile, DBC enriched soil iron-reducing bacteria and methanogenic archaea, which further enhanced the efficiency of extracellular electron transfer (EET), ultimately resulting in an increased CH₄ emission rate during the anaerobic stage and an elevated CO₂ emission rate during the aerobic stage. In conclusion, this research emphasizes the significance of wildfire-derived DBC in regulating the Fe-carbon-microbe coupling process within soil geochemical processes, thereby influencing greenhouse gas emissions.

17. 题目: Valorization of bamboo vinegar through modified biochar for synergistic cadmium immobilization and phosphorus activation in saline alkaline soil
文章编号: N26060613
期刊: Bioresource Technology
作者: Changming Yang, Yucan Xie, Liman Wei, Xiang Zhang
更新时间: 2026-06-06
摘要: Heavy metal contamination in saline-alkali soils poses a dual challenge of excessive alkalinity and nutrient deficiency, particularly phosphorus (P). Traditional biochar remediation often exhibits limited efficacy in these complex matrices due to the high ionic strength and recalcitrant P fractions. In this study, a bamboo vinegar-modified biochar (MB) was developed to simultaneously remediate cadmium (Cd) and activate P in saline-alkali soil. Modification significantly enhanced biochar textural properties, increasing the specific surface area and pore volume by 330.6% and 298.6%, respectively. MB application substantially ameliorated soil alkalinity and salinity, achieving superior reductions in pH (12.2%), ionic strength (48.8%), and sodium adsorption ratio (41.2%) compared to pristine biochar. MB induced a profound redistribution of Cd speciation, decreasing bioavailable Cd by 42.3% and expanding the residual pool by 29.6%. Simultaneously, the P availability coefficient was enhanced by 166.2%, driven by the dissolution of recalcitrant calcium-bound P and the mineralization of organic P. Mechanistic investigations reveal that MB establishes a synergistic remediation pathway integrating persistent acidification, desalination-driven immobilization, and microbial revitalization. The reduction in Cd toxicity and improved physiochemical environment stimulated the absolute abundance of P-solubilizing bacteria and phosphatase-encoding genes (phoC and phoD). Overall, our study highlights the potential of multifunctional modified biochar to overcome chemical and biological barriers, offering a sustainable strategy for the integrated management of nutrient cycles and heavy metal risks.

18. 题目: Integrated sludge resources hierarchical recovery: enhancing VFAs production through pilot scale liquid-state anaerobic fermentation by sludge residues-based biochar
文章编号: N26060612
期刊: Bioresource Technology
作者: Jing Zhang, Dong-Shan Yang, Jia-Yu Yang, Yun-Yi Song, Nan Wu, Tian Pu, Ge Zhu, Hong-Bo Liu, He Liu
更新时间: 2026-06-06
摘要: Efficient production of volatile fatty acids (VFAs) from waste activated sludge (WAS) is often constrained by limited substrate accessibility and mass-transfer resistance. This study proposed and evaluated a hierarchical resource recovery strategy by systematically comparing conventional whole-sludge fermentation and liquid-state fermentation, with and without biochar addition, in a 30 L pilot-scale digester. Liquid-state fermentation increased VFAs concentration and productivity by 93.2% and 161.7%, respectively, highlighting the decisive role of improved mass transfer and substrate availability. Biochar addition further enhanced VFAs production, increasing VFAs concentration by 34.6% and 29.5%, and VFAs productivity by 33.3% and 25.5% under conventional and liquid-state fermentation, respectively. Economic analysis showed that biochar-assisted liquid-state fermentation achieved a net profit of 4.27 USD/m3, which was 3.36-fold higher than that of the biochar-free scenario. Overall, the proposed hierarchical resource recovery strategy substantially improved VFAs production, maximizing the recovery of carbon and nutrient resources from sludge and representing a highly promising novel sludge resource utilization process.

19. 题目: Causes of suppression and retardation of reflectance of organic matter used for determination of maturity in sedimentary strata
文章编号: N26060611
期刊: Earth-Science Reviews
作者: Fariborz Goodarzi, Thomas Gentzis, Qnigyong Luo, Henrik I Petersen, Xiaowei Zheng
更新时间: 2026-06-06
摘要: This study examines the primary issue of suppression of vitrinite reflectance (%VRo) and the delay in organic matter reflectance in sedimentary rocks. If not recognized, these %VRo suppression and delay phenomena can lead to an underestimation of the local and regional thermal maturity required to initiate oil generation from hydrogen-rich organic matter relative to oxygen-rich organic matter, ultimately affecting the assessment of condensate liquids and wet/dry gas potential. Overlooking or misinterpreting %VRo suppression and delay can significantly influence basin analysis, hydrocarbon exploration and production, and petroleum resource evaluation.

20. 题目: One-step activation of biochar based on pretreatment black liquor: Edge‑nitrogen driven multidimensional adsorption of tetracycline hydrochloride and waste-liquid valorization
文章编号: N26060610
期刊: Chemical Engineering Journal
作者: Jianxun Ma, Yongxin Guo, Yue Ma, Siji Chen, Qiyun Li, Bolun Zhang, Shengchen Zhao
更新时间: 2026-06-06
摘要: Traditional chemical activation processes for biochar rely heavily on fresh reagents, resulting in high costs and a significant environmental burden; therefore, there is an urgent need for low-cost and sustainable activation strategies. Alkaline waste liquids rich in organic matter, generated during biomass pretreatment, represent a highly promising renewable activation medium. This study proposes a novel process for the recycling of waste liquid, utilizing NaOH-urea pretreatment waste liquid as an activator to prepare high-performance corn straw biochar (W-BCS) through a one-step synergistic activation process. For systematic comparison, biochar (BCS) activated by the traditional two-step method and biochar (P-BCS) activated with fresh reagents were also prepared. The study found that W-BCS formed a highly developed hierarchical porous structure with a specific surface area of 1988.20 m2/g, and its surface was rich in O- and N- containing functional groups. Adsorption tests indicated that W-BCS exhibited a maximum adsorption capacity of 1292.71 mg/g for tetracycline hydrochloride, which not only exceeded that of BCS (740.54 mg/g) but also approached that of P-BCS (1325.98 mg/g). Dynamic fixed-bed experiments validated its excellent continuous removal performance, retaining 67.3% of its adsorption capacity after ten thermal regeneration cycles. Combining spectroscopic analysis with theoretical calculations, the adsorption mechanism at the atomic scale was elucidated: edge nitrogen sites (pyridine nitrogen, -NH2) drive adsorption through electrostatic interactions and hydrogen bonding, accompanied by significant π-π stacking interactions. This study developed a feasible activation strategy for agricultural biomass waste, achieving the resource valorization of pretreatment waste liquid.