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1. 题目: Nondestructive Quantification of Soil Mineral Associated Organic Carbon Species and Their Distribution at the Global Scale
文章编号: N25121012
期刊: Environmental Science & Technology
作者: Daxin Gao, Chenchen Qu, Caroline Peacock, Xinglei Su, Qiuzhu Zheng, Jiaxin Zhao, Peng Cai, Wenli Chen, Xiuli Hao, Chengrong Chen, Qiaoyun Huang
更新时间: 2025-12-10
摘要: Several traditional chemical methods have been widely used in the evaluation of soil mineral associated organic carbon (MAOC). Yet, these methods may underestimate or overestimate the different MAOC species due to incomplete extraction or weak selectivity. Here, we establish a nondestructive technique to assess different MAOC species using SEM-EDS combined with a mineral fingerprint algorithm. We find that Fe oxyhydroxides (Fe-OC), phyllosilicates (Si-OC), Fe oxyhydroxides-Ca (Fe–Ca–OC) and Ca associated OC (Ca-OC) contribute to MAOC storage by 44.6 ± 29.3%, 24.2 ± 19.9%, 17.2 ± 16.5%, and 14.0 ± 18.8%, respectively, along a latitudinal gradient (18–47 N°, 3600 km) in China. Using the Random Forest model, we estimate the contribution of the four MAOC species to OC preservation in global soils at 1 m depth to be 333 ± 25, 191 ± 36, 207 ± 23, and 194 ± 25 Pg C, respectively. Our predictions challenge prevailing ideas on the preservation and distribution of MAOC species in soils. A holistic conceptual framework is proposed to describe the distribution patterns of MAOC species. Contrary to the current understanding, Fe–Ca–OC and Si-OC may play a critical role in the accumulation of OC in alkaline and acidic soils, respectively.

2. 题目: Dissolved organic matter molecular signature-driven source apportionment of domestic sewage in an urban river: Integrating absolute principal component score-multiple linear regression receptor modeling with ultra-high-resolution Orbitrap mass spectrometry
文章编号: N25121011
期刊: Journal of Environmental Chemical Engineering
作者: Xin Qi, Jingwei Feng, Liu Zhang, Hao Yin, Yang Fei, Xiaoyu Sun, Qiankun Liu, Shaofeng Xia
更新时间: 2025-12-10
摘要: The direct discharge or leakage of domestic sewage-resulting from incomplete construction of pipe networks-has become a central concern for both ecological environments and urban development. In this study, ultra-high-resolution mass spectrometry (UHR-MS) was employed to analyze the characteristics of dissolved organic matter (DOM) in an urban river (Shiwuli River). The absolute principal component scores-multiple linear regression (APCS-MLR) model was used to identify the sources of DOM based on UHR-MS data and to locate key sections of direct or leakage discharge of domestic sewage. The findings indicated that the contributions of anthropogenic pollution sources (high levels of CHOS, protein, and lipids), wastewater treatment plant effluent/reclaimed water (high strength of CHOS and other elemental compounds), and agricultural/natural sources (high content of CHON, lignin, and tannin) to the DOM were significant, reaching 28.0%, 26.3%, and 26.0%, respectively. The score for the human pollution source factor was highest during the wet season among the three periods, reflecting sewage overflow caused by rainfall. Based on the high values or rising trends of the human pollution source factor score, it was inferred that the S2-S3, S8-S9, and S11-S12 river sections were key locations of direct or leakage discharge of domestic sewage. The proposed method was validated through a field investigation. This research provides a methodological reference for tracing key locations of direct or leakage domestic sewage discharge.

3. 题目: Redox electrolyte enhances dual-anode FCDI (DA-FCDI) desalination of brackish and synchronously removal NOM
文章编号: N25121010
期刊: Chemical Engineering Journal
作者: Kexin Kang, Situ Mu, Jianrui Niu, Yongkun Shi, Jing Zhang, Chun Liu, Junjun Ma
更新时间: 2025-12-10
摘要: Natural brackish water bodies constitute complex mixtures. Accordingly, the production of high-quality drinking water from such sources necessitates the concurrent removal of salts and natural organic matter (NOM). A dual-anode circuit system (DA-FCDI) was developed by integrating electrochemical oxidation with flow-electrode capacitive deionization (FCDI). This dual-circuit configuration enables modulation of both desalination and electrochemical oxidation performances, while simultaneously regulating the charge and energy distribution between these two processes. At the same time, it was found that an increase in voltage difference between the internal and external circuits is beneficial for the degradation of organic matter. Furthermore, I⁻/I₃⁻ redox electrolytes were employed to expand the voltage window, thereby overcoming the voltage threshold limitation of the DA-FCDI system and enhancing its overall performance. When the applied voltage is 1.2 V - 1.8 V, ASRR and ATRR are 0.059 μmol cm⁻² min⁻¹ and 0.34 μg cm⁻² min⁻¹, respectively, and the specific energy consumption is only 0.052 kWh/m³.Compared to other technologies, this FCDI and electrochemical oxidation integrated device significantly reduces the consumption of chemical agents and simplifies the process flow. More importantly, while improving economic efficiency, it endows the system with high adaptability and controllability to different water qualities. This study breaks through the bottleneck of traditional single technology that cannot regulate and remove salt and organic matter separately.

4. 题目: Effect of Microplastics on the Growth of Wheat Seedlings in Biochar Remediation of Cd‐Contaminated Soil
文章编号: N25121009
期刊: Land Degradation & Development
作者: Fangfang Liang, Su Chen, Meng Lü, Wenhui Zhou, Zitong Ye
更新时间: 2025-12-10
摘要: The widespread occurrence of microplastics (MPs) in soil and their coexistence with cadmium (Cd) represent an emerging environmental hazard. Biochar (BC) has been widely recognized as an effective soil amendment for Cd remediation; however, it remains unclear whether the presence of MPs influences the efficacy of BC in promoting plant growth in Cd‐contaminated soils. In this study, a pot experiment was conducted to examine the effects of biodegradable polylactic acid (PLA) and non‐biodegradable polyamide‐6 (PA6) microplastics on wheat ( Triticum aestivum ) seedlings grown in Cd‐contaminated soil (3 mg·kg −1 ) amended with wheat‐straw biochar. Both unaged and dry‐wet cycle‐aged MPs (PLAD and PA6D) were introduced at concentrations of 0.25%, 0.5%, and 1% (w/w). Compared to BC alone, the combined MPs‐BC treatments reduced seedling fresh weight by 6%–45%. The addition of MPs generally increased root length, whereas unaged MPs suppressed plant height. Cd accumulation in both shoots and roots peaked under the 1% BC‐PA6 treatment, while MPs overall impeded Cd translocation from roots to shoots. PLA reduced the remediation efficiency of BC, as reflected by elevated peroxidase (POD) and malondialdehyde (MDA) levels, indicating enhanced membrane lipid peroxidation. In contrast, PA6 decreased POD activity but increased superoxide dismutase (SOD) and catalase (CAT) activities; MDA content rose following ageing, although unaged PA6 maintained low MDA levels. These findings elucidate how MPs interact with biochar in Cd‐contaminated soil and affect wheat seedling growth and antioxidative responses, thereby providing a scientific basis for optimizing soil remediation strategies under complex pollution conditions.

5. 题目: Seasonally recurring water column hypoxia impacts the partitioning of organic carbon mineralization and resultant manganese–iron–sulfur–phosphorus dynamics in coastal sediments
文章编号: N25121008
期刊: Limnology and Oceanography
作者: Jin‐Sook Mok, Sang Beom Baek, Haneul Kim, Hyeonji Lee, Jun‐Ho Koo, Jung‐Ho Hyun
更新时间: 2025-12-10
摘要: To elucidate the impact of changing water column hypoxia (WCH), defined as dissolved oxygen concentration < 63 μ M, on sediment biogeochemical processes, we conducted a fine‐scale investigation on the partitioning of major organic carbon (C org ) mineralization processes, the reduction of manganese (MnR), iron (FeR) and sulfate (SR), and the resulting Mn–Fe–S–P dynamics at two geochemically contrasting coastal sites with different manganese content. At the manganese‐rich site with moderate WCH conditions, MnR and FeR dominated C org mineralization in surface sediments, comprising up to 87% (0–1 cm depth) and 88% (1–2 cm depth) of C org mineralization, respectively. In particular, the reoxidation of Fe 2+ to Fe‐oxides coupled to abiotic MnR in the surface sediments induced P adsorption to Fe(Mn)‐oxides, thereby suppressing benthic P release. In contrast, at the relatively organic‐rich and sulfidic site with severe WCH, SR comprised up to 87% of the C org mineralization, and enhanced HS − production stimulated benthic P release. Moreover, the impact of WCH on the anoxic sediment condition persisted longer even after the termination of WCH, implying that the spatial–temporal expansion of WCH ultimately grants sulfidic sediments a role as a chronic source of P in most coastal ecosystems. Our results, combining fine‐scale C org mineralization rate measurements with comprehensive geochemical inventory analysis, provide crucial information to elucidate cause‐effect relationships behind observed phenomena on the distributions and flux of elements in coastal environments where WCH is expanding due to climate change and excessive human activities.

6. 题目: Organic matter cycling reveals escalating algal blooms and accelerated mineralization in a macrophyte-dominated cold-arid eutrophic lake
文章编号: N25121007
期刊: Water Research
作者: Fengrui Zhang, Wenxuan Han, Xue Sun, Zhaode Wang, Lei Zhang, Qiushi Shen, Haijin Lan, Bingfa Chen, Hongbin Yin, Cheng Liu
更新时间: 2025-12-10
摘要: The intensification of organic matter pollution is a critical issue in lake eutrophication research. Typically for macrophyte-dominated lakes of cold-arid regions, the increasing organic matter pollution, aggravating eutrophication status, and intensifying global changes amplify uncertainties in the evolution of lake ecosystems. This study investigates seasonal migration and transformation mechanisms of organic matter in Lake Ulansuhai, a macrophyte-dominated cold-arid eutrophic lake. Our findings revealed that Lake Ulansuhai exhibits persistently high organic matter concentrations in water and sediment, with dissolved organic matter dominating in the water column. Unlike subtropical lakes, organic matter burial in Lake Ulansuhai was significantly higher, peaking in winter, while mineralization occurred throughout spring, summer, and autumn. Summer conditions—elevated temperatures and algal-sourced organic matter—further accelerated mineralization. In addition, the accumulation of algal-sourced organic matter in the sediment and rapid consumption of algal-sourced organic matter in the water suggests an escalating trend in algal blooms. The warming trend of the area might intensify mineralization of buried organic matter through earlier ice melt and higher seasonal temperatures. These processes would in turn increase carbon emissions and promote a potential trend of transitioning to an algal-dominated turbid state. Future studies should give more focus on these accelerated organic matter cycling processes in similar cold-arid eutrophic lakes under an intensified global change trend.

7. 题目: Spatiotemporal dynamics of riverine microbial community structure and microbial interaction with changes of dissolved organic matter in Liaohe River Basin
文章编号: N25121006
期刊: Journal of Environmental Chemical Engineering
作者: Tao Ya, Weize Li, Xiaohan Yan, Lu Han
更新时间: 2025-12-10
摘要: The allochthonous and autochthonous dissolved organic matters (DOM) could highly influence the riverine bacterial community, however, their influence on community assembly and microbial interactions remains unclear. We conducted a seasonal field sampling at 12 sites to examine the variations of DOM properties, bacteria community structure, assembly process, and microbial interaction in Liaohe River Basin. It was found that the degree of aromaticity was higher in dry season and in the downstream. Significant correlations were found between the components of DOM and Shannon as well as Shannoneven during dry season (p < 0.05). Besides, stochastic processes dominated the bacterial community assembly in upstream (74.00%) and in dry seasons (77.78%) of Liaohe River Basin. We concluded that the temporal variations drove the dynamics of microbial-DOM relationship, and dry season microbial network (Net D) exhibited more complex and connected interactions. More positive relationships as well as complex interactions between DOM and bacterial taxa in dry season might be due to the lower DOC but higher aromaticity of DOM. Verrucomicrobiota had greater abundance and more connections in dry season, contrasting with Firmicutes that dominated in wet season. And the majority of keystone species belonged to Proteobacteria and Bacteroidota, which exhibited relative low abundance (< 1%). This study elucidated the role of DOM fluctuations in shaping bacterial community structure and interaction in river ecosystems.

8. 题目: Dynamics of iron-bound organic carbon sequestration in soil-cement aggregates during the ecological restoration process
文章编号: N25121005
期刊: Journal of Environmental Chemical Engineering
作者: Ruzhang Gao, Bingqin Zhao, Jiwei Wang, Weihao Shi, Haoran Wang, Junhao Zhu, Xingfeng Zhang, Dong Xia, Daxiang Liu, Liming Liu, Zhenyao Xia, Wennian Xu
更新时间: 2025-12-10
摘要: Iron-bound organic carbon (OC-Fe) is integral to soil carbon sequestration; however, comprehensive research on its fixation characteristics in different aggregate types during ecological-restoration-engineering projects remains limited. To address this shortcoming, we focused on vegetated soil-cement—a representative ecological-restoration-engineering substrate—adopting an aggregate-scale perspective to reveal the spatial distribution of OC-Fe. We quantified contributions from key indicators of OC-Fe formation—including aggregate stability indexes, organic carbon fractions, and different iron oxides—and analysed the interaction between aggregate structure and OC-Fe. Thus, we unravelled the feedback mechanisms between aggregate structure and OC-Fe. Key findings include (1) OC-Fe concentration was the highest in microaggregates (1.62g/kg on average) and increased substantially with decreasing aggregate size. (2) Amorphous iron oxides (Feo) and dissolved organic carbon (DOC) emerged as the primary contributors to OC-Fe formation, with contribution rates in the ranges 19.23%–30.58% and 19.17%–27.07%, respectively. (3) A significant positive correlation was observed between OC-Fe and aggregate stability indices (p < 0.05). Moreover, aggregate stability indirectly affected OC-Fe, mediated by organic carbon fractions (path coefficient: 0.227) and iron oxides (0.164), indicating a positive feedback regulation mechanism. As a vital component of the stable soil carbon pool, the sequestration characteristics of OC-Fe are crucial for maintaining long-term soil organic carbon stability. By providing novel insights into soil carbon sequestration within aggregates of various sizes, this study offers theoretical support for enhancing carbon sequestration in ecologically restored soils and foundational support for the dual objective of enhancing both structural stability and carbon sink capacity in ecological-restoration-engineering projects.

9. 题目: Assessment and refinement of CDOM retrieval methods for coastal waters in the South Eastern Arabian Sea.
文章编号: N25121004
期刊: Environmental Monitoring and Assessment
作者: Souda V P., Minu P., Aneesh Lotliker, Muhamed Ashraf P.
更新时间: 2025-12-10
摘要: CDOM, an important ocean colour product, accounts for 90% of non-water UV absorption in the upper ocean. CDOM absorption triggers photochemical reactions resulting in the release of greenhouse gases and alters microbial bioavailability of organic matter. The three different approaches for retrieving adg(λ) from satellite data were validated using aCDOM(λ) generated from OC-CCI-derived remote sensing reflectance (Rrs) and in situ measured aCDOM(λ). The multiple linear regression (MLR) model performed better than the two exponential decay models in quantifying CDOM in the UV region. The better performance of Rrs-based algorithms indicated that absorption-based algorithms need considerable improvement when compared to algorithms based on the combined absorption by detrital matter and CDOM (adg(λ)). As a result, the absorption-based algorithm was modified as the ASCDOM algorithm, which demonstrated improved retrieval at 275, 355, 38 and 412 nm for aCDOM(λ). The ASCDOM algorithm's strong statistical performance highlights its accuracy in retrieving satellite products for water quality evaluations and ocean colour monitoring.

10. 题目: Molten Li/Na/K ternary carbonate salt pyrolysis of biomass: A facile approach for co-production of porous biochar, CO-enriched syngas, and high-selectivity bio-oil
文章编号: N25121003
期刊: Journal of Cleaner Production
作者: Jiazhen Tang, Tianyu Lu, Xing Xie, Dan Lin, Dongjing Liu, Qingfa Zhang, Mingfeng Wang, Weiwei Liu, Zhong Ma, Haiping Yang, Shihong Zhang, Bin Li
更新时间: 2025-12-10
摘要: This study aims to systematically investigate the effects of temperature and molten carbonate salts on the formation and regulation of pyrolysis products, pine sawdust pyrolysis in molten Li2CO3-Na2CO3-K2CO3 ternary salt was examined using a fixed-bed reactor. The results indicated that high-concentration of alkali cations and CO32− anions in molten salts significantly altered reaction pathways and product distributions compared to conventional pyrolysis. Alkali cations promoted charring reactions, with increased O retention in biochar leading to higher yields with lower aromaticity. Their strong catalytic effect on primary pyrolysis and secondary cracking resulted in a substantial reduction in bio-oil yield. At 500 °C, enhanced ring-opening of sugar units, along with dehydrogenation, decarboxylation, and WGS reactions, produced an anhydrosugar-free bio-oil, accompanied by increased H2 and CO2 formation in non-condensable gas. Increasing temperature strengthened alkali cation-induced deoxygenation and cracking of bio-oil, yielding a bio-oil enriched in phenols and aromatic hydrocarbons. Concurrently, CO32− anions in molten salts acted as activators, etching the char surface to create pores while generating CO, particularly at high temperatures (e.g., 800–900 °C). A highly porous biochar (BET surface area of 971.28 m2/g) and an extremely high non-condensable gas yield (147.33 wt%) were obtained at 900 °C, with CO + H2 accounting for 82.51 vol%. The biochar produced at 800 °C (800MPY) exhibited a superior CO2 adsorption capacity of 4.5 mmol/g (@ 0 °C, 1 bar). This study demonstrates that molten carbonate salt pyrolysis of biomass enables one-step co-production of porous biochar, CO-enriched syngas, and high-selectivity bio-oil, highlighting its potential for high-value biomass utilization.

11. 题目: Machine learning-based analysis of distribution characteristics and sensitivity of soil organic carbon in typical soils of China
文章编号: N25121002
期刊: Journal of Cleaner Production
作者: Wenjing Li, Li Ma, Huiyuan Zhang, Chao Zhang, Hongri Bao
更新时间: 2025-12-10
摘要: Soil organic carbon (SOC) is a vital component of the terrestrial ecosystem carbon cycle, reducing global warming and promoting plant nutrition, with its changes greatly impacting the global carbon balance and climate change. Recent studies show that different soil types have different abilities to store carbon under the influence of climate, topography, vegetation, and human activities. This study investigates five typical soil types in China (dark brown soil, aeolian soil, alpine meadow soil, red soil, and yellow soil), utilizing an open-access SOC density database and relevant literature to collect SOC density data from 2004 to 2023. Using the Random Forest (RF) model, the SOC density of the 0–20 cm soil layer from 2000 to 2023 was examined to reveal its changes over time and location and influencing factors. The study integrated SOC data from 2000 to 2023 with environmental factors, including climate, topography, vegetation, and soil properties. We found that SOC density across the five soil types ranks as follows: dark brown soil (8.75 kg/m2) > alpine meadow soil (6.59 kg/m2) > yellow soil (5.81 kg/m2) > red soil (4.57 kg/m2) > aeolian soil (2.47 kg/m2). The carbon storage capacity of these soil types is influenced by factors like climate, vegetation, and soil properties. Furthermore, SHAP analysis revealed how each soil type responds differently to these factors. Based on these findings, we propose strategies for managing soil carbon storage. For different soil types, we recommend measures like restoring plant cover, using conservation tillage, and increasing tree planting to boost carbon storage and align with the dual carbon goals of China to tackle climate change.

12. 题目: Compact graphitic architecture in herbal residue-derived Fe-biochar boosts PMS activation via singlet oxygen pathway for sulfamethoxazole degradation
文章编号: N25121001
期刊: Chemical Engineering Journal
作者: Wei Liu, Haojie Dong, Yuanyi Zhou, Zicong Jiang, Junxia Zheng, Mingshan Zhu, Xiangjiu He
更新时间: 2025-12-10
摘要: The production of functional biochar catalysts from waste biomass is vital for achieving environmental sustainability and waste valorization. Understanding the correlation between the complex composition of raw biomass and the derived biochar catalyst's properties is urgently needed. Herein, three Fe nanoparticle-loaded biochar (Fe-BC) composites are prepared using different herbal residues (glycyrrhiza, platycodon, and astragalus) as precursors. Systematic characterization shows that the carbonization and graphitization degree of biochar depend on the cellulose crystallinity of the raw biomass. The highly graphitized structure leads to a weak interaction between the carbon skeleton and the supported Fe nanoparticles (NPs), which effectively suppresses the oxidative corrosion of Fe NPs and enhances stability. As a result, the glycyrrhiza-derived Fe-BC catalyst exhibits outstanding performance in activating peroxymonosulfate (PMS) for sulfamethoxazole (SMX) degradation, with a rate constant of 0.54 min−1. This performance is 91 times higher than that of the platycodon-derived catalyst (0.0059 min−1) with the lowest graphitization degree, demonstrating significant potential for wastewater treatment. This work offers new insights into the structure-property relationship of biochar catalysts and guides the rational utilization of waste biomass.

13. 题目: Increased Retention of Litter-Derived Organic Carbon With Increasing Initial Carbon Content in Temperate Agricultural Soils
文章编号: N25120925
期刊: Global Change Biology
作者: Neha Begill, Steffen A Schweizer, Axel Don, Carmen Hoeschen, Marcus Schiedung, Georg Guggenberger, Christopher Poeplau
更新时间: 2025-12-09
摘要: Stabilized soil organic carbon (SOC) accrual plays a crucial role in long-term atmospheric CO₂ sequestration. The organic carbon in the fine silt and clay size fraction (OC_fine) is typically mineral-associated and thus relatively stable. However, the SOC saturation concept suggests that the OC_fine has limited capacity for additional carbon (C) storage, thereby constraining further C sequestration. Low-OC and fine-textured soils are thought to have greater potential to stabilize additional OC than High-OC and coarse-textured soils due to their higher available storage space. Here, we assessed soils' potential to stabilize additional OC using 21 temperate agricultural soils, varying in SOC (0.7%–10.2%), silt + clay content (32%–92%), and OC loading of fine fraction (17–135 g C kg⁻¹). We investigated the decomposition and recovery of uniform ¹³C labeled litter after 2 years in two size-based fractions: OC_coarse (> 20 μm, the OC associated with coarse silt and sand) and OC_fine (< 20 μm). Litter-derived OC retention increased significantly with initial SOC content and fine fraction OC loading, primarily driven by the OC_coarse fraction, which indicated that less added C was utilized by microbes when enough C was already abundant. In contrast, litter-derived OC_fine formation was negatively correlated with initial SOC and fine fraction OC loading. However, when normalized to the amount of actually decomposed litter, initial SOC and texture did not significantly affect the efficiency of OC_fine formation. NanoSIMS showed litter-derived OC forming at distinct microscale patches, partly overlapping with OM- and mineral-dominated sites. Both findings together revealed that initial SOC content in the studied range, OC loading of the fine fraction, or even soil texture may not be major limiting factors of new OC_fine formation. Instead, increasing initial SOC content appeared to have a positive effect on litter-derived OC retention by retarding its mineralization.

14. 题目: Fouling Mechanisms of Nanofiltration Membranes Induced by Residual Aluminum and Natural Organic Matter in Drinking Water Treatment
文章编号: N25120924
期刊: Environmental Science & Technology
作者: Ziyi Yuan, Yanling Liu, Kaiming Fan, Yunfei Li, Siqi Wang, Shengji Xia, Xiao-mao Wang
更新时间: 2025-12-09
摘要: Though complexes formed between residual active aluminum (Al_a) and natural organic matter (NOM) have been identified as key contributors to the aggravation of nanofiltration membrane fouling, the fouling behaviors and mechanisms of Al_a–NOM complexes remain poorly understood. In this study, the unique role of Al_a in inducing membrane organic fouling and the interspecies interactions within Al_a–NOM complexes were investigated. The results showed that complexes formed between Al_a and fulvic acid (FA) created a compact foulant layer attaching to the membrane surface, which contributed more than 90% of the total fouling resistance. This surface-attached foulant layer was attributed to the high electronegativity of Al_a, which induced conformational rearrangement within FA molecules and exposed additional reactive functional groups which would be involved in membrane fouling. Moreover, the Al_a within the Al_a–FA complexes bridged to carboxyl groups on the membrane surface through strong hydrogen bonds and continuous charge-transfer channels, reinforcing the stability and adhesion of this fouling layer. Unexpectedly, the addition of sodium alginate at only one-seventh the concentration of FA significantly mitigated Al_a–FA fouling by encapsulating the Al_a–FA complexes and disrupting the formation of the surface-attached foulant layer. This study provides new mechanistic insights into residual aluminum-involved organic fouling faced by nanofiltration membranes in drinking water treatment.

15. 题目: Positive Microbial‐Enzyme Feedbacks on Soil Organic Carbon Enhance Understory Cultivation of Paris polyphylla Across Forest Types
文章编号: N25120923
期刊: Land Degradation & Development
作者: Hongbin Zhang, Shouzan Liu, Shaobo Zhang, Yan Bai
更新时间: 2025-12-09
摘要: Understory imitation wild cultivation is widely used in production practice to improve the yield of Chinese medicinal plants. However, the impacts and mechanisms of cultivating medicinal plants under different forest types on soil organic carbon (SOC) pools, enzyme activities, and the diversity of cbh I‐functional microorganisms remain unclear. This study examined variations in soil SOC fractions, enzyme activities, and cbh I‐functional microbial communities, along with the interrelationships among these factors, in Paris polyphylla cultivation under the Moso bamboo forest, Chinese fir forest, and bamboo–Chinese fir mixed forest. The results indicated that the Chinese fir forest soil exhibited significantly higher contents of SOC (33.7 g kg −1 ), microbial biomass carbon (MBC) (361.2 mg kg −1 ), and water‐soluble organic carbon (WSOC) (176.6 mg kg −1 ), which were 27.2%, 73.7%, and 79.1% greater than those in the Moso bamboo forest (SOC: 26.5 g kg −1 , MBC: 207.9 mg kg −1 , WSOC: 98.6 mg kg −1 ), respectively. Furthermore, the mixed forest soil also showed significantly higher MBC (446.9 mg kg −1 ) and WSOC (118.5 mg kg −1 ) than the Moso bamboo soil, which were 115.0% and 20.2% higher, respectively. In addition, the activities of cellobiohydrolase, β‐glucosidase, and invertase in the soil of the Chinese fir forest were significantly higher than those of the bamboo forest, and the activities of cellobiohydrolase and invertase in the soil of the mixed forest were also significantly higher than that of the Moso bamboo. Correlation analysis revealed significant positive correlations between SOC, WSOC, and the activities of cellobiohydrolase, β‐glucosidase, and invertase, while MBC was significantly positively correlated with invertase activity. Mantel tests and Canonical correspondence analysis further highlighted soil pH, MBC, WSOC, and the activities of cellobiohydrolase and invertase as key environmental drivers of the cbh I microbial community structure. Interestingly, Moso bamboo forest soil supported a higher abundance of pathogenic fungi (e.g., Gaeumannomyces and Colletotrichum ), while Chinese fir forest soil was enriched with cellulose‐degrading bacteria (e.g., Irpex and Pyrenophora ), and mixed forest soil exhibited a relatively higher abundance of broad‐spectrum degraders (e.g., Clitopilus and Apiotrichum ). We conclude that Chinese fir and mixed forests have higher SOC storage, which can create a more favorable soil microenvironment for the cultivation of P. polyphylla . Due to the low SOC storage, the Moso bamboo forest is unfavorable for the growth and development of P. polyphylla .

16. 题目: High efficiency capture of COD and phosphate in real domestic wastewater by Fe(VI)/PAC combined with high-rate contact stabilization process: Performance and mechanism
文章编号: N25120922
期刊: Water Research
作者: Lian Wu, Hang Li, Jinan Zhu, Guang Yang, Yulei Liu, Jun Ma, Lu Wang
更新时间: 2025-12-09
摘要: This study proposed the integration of potassium ferrate (Fe(VI)) in combination with poly-aluminum chloride (PAC) into a high-rate contact stabilization (HRCS) process for simultaneous carbon and phosphorus removal from real domestic wastewater. Results showed that by adding 15 mg/L Fe(VI) (as Fe) for pre-oxidation followed by 20 mg/L PAC (as Al) for coagulation before the HRCS system, the removal efficiency of the whole system for COD and PO₄³⁻-P reached 89.74% and 100%, respectively, and the concentrations of COD and PO₄³⁻-P in the effluent reached the Chinese Class 1A wastewater discharge standard. More importantly, the pathway of COD and phosphorus elimination was extremely different from that of conventional activated sludge process, mainly through adsorption, with adsorption accounting for 86.11% and 100%, respectively. This enhanced adsorption capacity derived from the enhanced flocculation of Fe(VI), the promoted formation of inorganic particles (e.g., FeOOH, Fe₂O₃) and mineral precipitates (e.g., Fe₂PO₄(OH) and Al₂PO₄(OH)₃), the increased secretion of extracellular polymeric substances by the sludge (an increase of 33.20%), and the enrichment of bacterial genera with biosorption function (unclassified_f_Comamonadaceae and Zoogloea) upon exposure to Fe(VI) and PAC. Furthermore, microbial toxicity analyses indicated that applying Fe(VI) and PAC promoted the overproduction of reactive oxygen species (ROS) and the disruption of cell membrane integrity, which reduced microbial activity and made it difficult for microbial degradation of pollutants to facilitate the adsorption of carbon and phosphorus. This study provides theoretical guidance for the application of Fe(VI) to the low-carbon treatment of real domestic wastewater.

17. 题目: Advancing remote sensing of fluorescent dissolved organic matter by removing multi-source interferences in remote sensing reflectance: evidence from the Mackenzie delta
文章编号: N25120921
期刊: Journal of Hydrology
作者: Ruiwu Zhang, Ruru Deng, Jun Ying
更新时间: 2025-12-09
摘要: Accurate remote sensing of fluorescent dissolved organic matter (fDOM) is a challenging task due to the interference from multiple signal sources in remote sensing reflectance ( ). To overcome this limitation, we propose a method that isolates fDOM optical signals by systematically removing various interference factors, including atmospheric scattering, surface glint, solar-induced chlorophyll fluorescence (SIF), Raman scattering, and non-algal particle absorption. Using in situ observations from the Mackenzie Delta, we sequentially corrected for these interferences and validated the results with a radiative transfer model. We then developed expressions for three fDOM components (C1, C2, and C3) based on the absorption coefficients of colored dissolved organic matter ( ), and applied the method to MODIS satellite data. The results demonstrate that the removal of multi-source interferences substantially improved the stability of and the accuracy of fDOM signal retrieval, with SIF identified as the dominant interfering factor. Furthermore, and effectively distinguished the three fDOM components without spectral overlap, thereby enhancing retrieval accuracy. The inversion results reveal that C1 and C2 are primarily distributed in nearshore waters and extend offshore, while C3 is concentrated in offshore open waters with gradual attenuation. This spatial distribution pattern highlights the spatiotemporal dynamics of terrestrial organic matter inputs and their suppressive effect on autochthonous DOM production. Overall, the proposed approach enhances the reliability of fDOM remote sensing retrievals and expands its potential applications in large-scale water quality assessment and organic pollution source tracking.

18. 题目: Deprotonated Nanofilms-Enabled Fluorescence-Colorimetric Dual-Mode Sensing of 3-Hydroxy-2-butanone.
文章编号: N25120920
期刊: Analytical Chemistry
作者: Xue Gu, Xinyu Gou, Yan Jiang, Xiangquan Liu, Binbin Zhai, Ruijuan Wen, Zhiyan Ma, Yu Fang
更新时间: 2025-12-09
摘要: 3-Hydroxy-2-butanone (3H2B) is a key gaseous metabolite of Listeria monocytogenes, a potential lung cancer biomarker, and a widely used food flavoring agent, underscoring the demand for real-time monitoring solutions. In this study, we designed a salicylaldehyde-functionalized 1,8-naphthalimide derivative (NI-OH-CHO) and reacted it with 1,3,5-tri(4-aminophenyl)benzene (TAPB) at a liquid/liquid interface to synthesize fluorescent NI-TAPB nanofilms. Upon deprotonation, the nanofilms (NI-TAPB@F) exhibit a reversible and unprecedented fluorescence response to 3H2B. Leveraging this discovery, we developed a fluorescent 3H2B sensor with exceptional performance: ultrahigh sensitivity (detection limit: ∼ 1.8 ppb), rapid response (<8 s), outstanding selectivity, and remarkable stability at room temperature. These advantages stem from the rational design of binding sites and the porous structure of the nanofilms. Furthermore, visual 3H2B detection was achieved using the deprotonated films. Notably, the nanofilms are self-standing, self-adhesive, and flexible, enabling substrate-independent detection by eliminating interference from background color or emission. These properties also facilitate on-site qualitative and quantitative analysis. We anticipate this work will pave the way for the development of portable 3H2B detection devices.

19. 题目: Biochar-Microbe-Hydrogel with Cyclic Hydraulic Leaching Establishing Niches for Integrated Soil-Groundwater Bioremediation
文章编号: N25120919
期刊: Water Research
作者: Deping Li, Wenbo Guo, Xiaoyu Ma, Xinde Cao, Yong Geng, Yi Lang, Hanwen Li, Yanwen Shen, Ling Zhao
更新时间: 2025-12-09
摘要: Bioremediation of soil and groundwater contaminated by persistent organic pollutants (e.g., chlorinated organics) using functional bacteria faces inherent challenges, such as competition from indigenous microorganisms (exogenous bacteria is difficult to establish microbial niches in soil) and poor pollutant accessibility. This study developed an integrated strategy that combines Biochar-Microbe-Hydrogel (BMH) matrix with Cyclic Hydraulic Leaching (CHL) for the concurrent bioremediation of soil-groundwater. The BMH is active gel beads encapsulated functional bacteria in porous biochar with hydrogel. The lab-scale soil column experiments demonstrated a 91.4% removal efficiency for 2,4,6-trichloropherol (TCP) from a high contaminated soil concentration of 667 mg·kg^-1, substantially outperforming the controls (53.9%). The water flow by cyclic leaching promoted the elution of TCP from soil, followed by its re-adsorption and subsequent biodegradation in the BMH matrix. The constant proliferated bacteria (in this study we used Sphingomonas fennica as TCP degrading bacteria) migrated through biochar channels, constructing its niches along soil profile. This study also observed that the bacteria S. fennica competed with native soil microorganisms for niches in its high-density existence, but a shift toward cooperation was found at its low microbial abundance. This study provides an integrated bioremediation solution of soil and groundwater (BMH-CHL) that is highly prospective for achieving effective field application.

20. 题目: Biochar and moisture variability shape soil carbon pools via microbial carbon-degrading genes
文章编号: N25120918
期刊: Journal of Environmental Management
作者: Yue Pan, Tingting Tan, Jie Meng, Hongpeng Guo, Yingbo Dong, Yukui Cui, Na Yu, Xinxin Jin, Yuling Zhang, Hongtao Zou, Nanthi Bolan, Kadambot H M Siddique
更新时间: 2025-12-09
摘要: Microbially derived organic carbon is a key component of the soil carbon pool. Shifts in microbial communities and their associated functional genes—triggered by moisture variability and biochar addition—can influence the composition and stability of soil organic carbon (SOC). However, the microbial processes involved in SOC formation and degradation under different biochar levels and moisture variability intensities remain clear. To address this, we conducted a 90-day microcosmic incubation using three levels of biochar addition (C0: 0, C1: 1 %, C2: 2 %, w/w) and three moisture regimes (W0: constant moisture, W1: high-intensity variability, W2: low-intensity variability) to analyzed microbial communities, carbohydrase activity, C-degrading genes, and C, N, and P enzyme activities to trace and characterize microbial contributions to SOC formation. The results showed a shift in the dominant soil microbial community from Actinomycetes to Ascomycetes with increasing moisture variability. Microbial biomass carbon increased by 158–900 % relative to C0W0, peaking under C2W1. This stimulation enhanced microbial carbon sequestration under high moisture variability while simultaneously accelerating the decomposition of both plant- and microbial-derived carbon. Biochar addition exerted only a marginal, non-significant inhibitory effect on the decomposition either carbon source (P > 0.05). Functional gene analysis revealed that 62 % of carbohydrate-active enzymes (CAZymes) targeted plant-derived components significantly exceeding the 38 % targeting microbial-derived components, indicating a significantly stronger degradation potential for plant residues under varying moisture conditions. This process was genetically regulated, as shown by the concurrent increase in of carbon-degrading gene abundance and corresponding enzyme activities. Consequently, microbial activity was efficiently modulated, with carbon use efficiency increasing by up to 767 % compared with the C0W0. Moisture variability and its interaction with biochar significantly (P < 0.05) or highly significantly (P < 0.01) affected these microbial indicators. This study reveals a moisture-driven microbial “carbon pump” operating through coordinating gene–enzyme–community regulation. Within this framework, up-regulated carbon-degrading genes align with enzyme activities to channel plant-derived carbon into stable SOC. The C2W1 treatment achieved the highest SOC stabilization, offering a theoretical basis for managing SOC under extreme climate conditions and advancing mechanistic understanding of microbe-mediated carbon dynamics.