Science of the Total Environment最新文献

{"title":"Factors predicting incidence of nontuberculous mycobacteria in an era of climate change and altered ecosystems in the United States","authors":"Samantha J. Bents ,&nbsp;Collin Powell ,&nbsp;Joshua P. French ,&nbsp;D. Rebecca Prevots ,&nbsp;Rachel A. Mercaldo","doi":"10.1016/j.scitotenv.2025.180338","DOIUrl":"10.1016/j.scitotenv.2025.180338","url":null,"abstract":"<div><h3>Background</h3><div>Nontuberculous mycobacteria (NTM) are ubiquitous environmental bacteria that cause chronic pulmonary disease. Incidence patterns have risen globally over the last several decades. Prior studies suggest that climate change may have a role in increasing incidence patterns.</div></div><div><h3>Methods</h3><div>We analyzed NTM incidence from two US-based populations: Medicare beneficiaries and persons with cystic fibrosis (pwCF). We identified predictors of NTM incidence with time-lagged meteorological and severe weather event covariates across US climate zones.</div></div><div><h3>Findings</h3><div>The average annual incidence of NTM was 30.4 per 100,000 for the Medicare population and 2071.4 per 100,000 pwCF, with both populations showing rising incidence over the study period. We found that several factors predicted NTM incidence risk for the Medicare population and pwCF. In the Southeastern US particularly, floods were predictors of NTM incidence risk and across the mid-latitude US, dust storms were predictors of incidence. Air pressure, cloud cover, precipitation, and the number of days above various temperature thresholds were consistent predictors of NTM incidence across climate zones. The lag time between predictive meteorological variation or weather events and NTM incidence varied by zone and population studied.</div></div><div><h3>Interpretation</h3><div>Geographic heterogeneity exists in the meteorological and severe event factors predictive of NTM incidence, evidenced by data from two high-risk study populations in the US. The role of continued climate change in the spatial and temporal distribution of NTM incidence merits further research.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180338"},"PeriodicalIF":8.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ozone dry deposition and chemical removal in the urban environment of Beijing: I. Chemical and meteorological controlling parameters","authors":"Daniel Choi ,&nbsp;Yibo Huangfu ,&nbsp;Erick Fredj ,&nbsp;Qian Li ,&nbsp;Bin Yuan ,&nbsp;Xiaoxiao Zhang ,&nbsp;Xianjun He ,&nbsp;Huizhi Liu ,&nbsp;Eran Tas","doi":"10.1016/j.scitotenv.2025.180347","DOIUrl":"10.1016/j.scitotenv.2025.180347","url":null,"abstract":"<div><div>Tropospheric ozone (O₃) is a major air pollutant that negatively affects human health and vegetation, and plays a central role in climate change and atmospheric chemistry. Current simulations of tropospheric O₃ concentrations in climate and air-quality models are significantly limited by the inaccurate representation of O₃ dry deposition rate—particularly in urban areas, where field measurements remain scarce. We hypothesize that O₃ dry deposition in the urban environment is controlled by factors similar to those over vegetation, albeit via potentially different mechanisms. Accordingly, we performed O₃ and reactive nitrogen oxide (NO_x = [NO] + [NO₂]) flux measurements using eddy covariance (EC) technique from a meteorological tower in an urban area of Beijing (IAP) during the spring and summer, complemented by EC flux measurements of volatile organic compounds (VOCs) using Vocus-PTR-TOF-MS. Our analyses indicated that the downward ozone velocity (Vdw,O₃) at the IAP measurement site is controlled by both gas-phase chemical reactions and surface uptake, with comparable contributions. The reaction of O₃ with NO emissions dominated the chemical contribution to Vdw,O₃, with a significant contribution of NO near the ground, particularly in the morning. The effect of relative humidity (RH) on Vdw,O₃, likely via surface wetness accumulation similar to its effect on non-stomatal O₃ deposition over vegetation, showed a logarithmic and hyperbolic dependency of Vdw,O₃ on RH, for 5 % &lt; RH &lt; 30 % and RH &gt; 70 %, respectively. Both NO emissions from elevated sources and RH &lt; 30 %—conditions associated with a higher frequency of positive O₃ flux events—dramatically limited Vdw,O₃.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180347"},"PeriodicalIF":8.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid geomorphic adjustment to anthropogenic vegetation removal and meander cutoffs: Evidence from a lowland meandering river","authors":"Katarina Pavlek ,&nbsp;Ronald E. Poeppl ,&nbsp;Tomáš Galia ,&nbsp;Mateo Gašparović","doi":"10.1016/j.scitotenv.2025.180323","DOIUrl":"10.1016/j.scitotenv.2025.180323","url":null,"abstract":"<div><div>Human interventions, such as vegetation removal and engineering structures, can significantly alter river dynamics, often increasing erosion and flood risk. While many studies have examined the role of vegetation, flood regimes, and channel geometry in river morphodynamics, long-term, reach-scale analyses of channel response to abrupt riparian vegetation removal remain scarce. This study examines channel changes in the meandering Orljava River, Croatia, over the past 55 years, focusing on its response to floods before and after anthropogenic removal of riparian vegetation in 2011. Channel morphometric parameters were measured using aerial images, orthophotos, and topographic maps. To assess factors influencing lateral migration rates, data on flood magnitude, duration, riparian vegetation, and channel geometry were analysed using linear mixed models. The results showed a fourfold increase in migration rates and a 40 % increase in channel width after vegetation removal. Statistical analysis revealed that migration rates were negatively related to riparian vegetation cover and positively related to the duration of geomorphically effective discharges, channel slope, and width. The most geomorphically dynamic sections were located downstream of mill weirs and artificial meander cutoffs, which locally modify channel slope and increase stream power. These findings suggest that human interventions have been the primary drivers of intense bank erosion, channel migration, and agricultural land loss. To mitigate lateral erosion and flood risks in actively meandering rivers like the Orljava, restoring riparian vegetation is crucial for stabilizing riverbanks. Additionally, preserving natural sinuosity can enhance geomorphological diversity and improve channel stability by reducing slope and stream power.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180323"},"PeriodicalIF":8.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CO2 cut-down potential of conventional iron and steel making process in China based on carbon transfer and emission identification","authors":"Binfan Jiang ,&nbsp;Zhuohang Tian ,&nbsp;Qiuwang Wang ,&nbsp;Dehong Xia ,&nbsp;Yanmin Wang ,&nbsp;Kaijun Zhang","doi":"10.1016/j.scitotenv.2025.180372","DOIUrl":"10.1016/j.scitotenv.2025.180372","url":null,"abstract":"<div><div>Iron and steel industry is the largest CO₂ contributor in China's energy end-users, accounting for 15 % of the national emission, whose decarbonization is the key step for carbon neutrality. Blast Furnace and Basic Oxygen Furnace (BF-BOF) process dominates steel production in China, and carbon flow inside that process with multi-layered energy and material network is complex, leading to difficulty in CO₂ emission estimation. Herein, to understand the CO₂ emission and its cut-down potential of iron and steel industry, a carbon counting model is established and typical decarbonization ways are taken into consideration, including energy efficiency improvement, raw material composition reformation and traditional blast furnace technology innovation. The carbon counting model is based on detailed carbon transfer analysis in the BF-BOF process, and can be used to show the changes in carbon flows and CO₂ emissions caused by typical decarbonization methods. The CO₂ emissions of the BF-BOF process in China are estimated to be 1864.9 Mt. (1.954 kgCO₂/t cs), and around 61.03 % is from BF iron-making procedure. For traditional BF-BOF process, improving energy efficiency and reforming raw material composition can reduce CO₂ emissions by 71.9 kgCO₂/t cs (3.68 %) and 317.1 kgCO₂/t cs (16.23 %), respectively. Innovating traditional BF iron-making technology can achieve more significant reduction in CO₂ emissions. Compared to the traditional BF-BOF process, the oxygen blast furnace with top gas recycling and the one with top gas recycling plus COG injection can reduce CO₂ emissions by 557.1 kgCO₂/t cs (28.51 %) and 707.8 kgCO₂/t cs (36.22 %), respectively.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180372"},"PeriodicalIF":8.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pyrethroid-driven toxicity and its relationships with urban land use: Findings from 15 years of statewide monitoring in California watersheds","authors":"Bushra Khan ,&nbsp;Bryn M. Phillips ,&nbsp;Tessa Fojut ,&nbsp;Ronald S. Tjeerdema","doi":"10.1016/j.scitotenv.2025.180330","DOIUrl":"10.1016/j.scitotenv.2025.180330","url":null,"abstract":"<div><div>The Stream Pollution Trends Monitoring Program (SPoT) is one of several statewide programs under California's Surface Water Ambient Monitoring Program (SWAMP). SPoT has been generating sediment toxicity and pollutant data since 2008 from up to 100 diverse watersheds. Analysis has included toxicity testing with the amphipod <em>Hyalella azteca</em> and, more recently, the midge <em>Chironomus dilutus</em>, as well as the measurement of metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), legacy pesticides, current use pesticides, and emerging contaminants such as fipronil, polybrominated diphenyl ethers (PBDEs) and <em>per</em>- and poly-fluoroalkyl substances (PFAS) in watershed sediments. This extensive data set has been analyzed in the context of watershed land use to understand the nature and spatiotemporal trends of identified aquatic pollutants. The most significant relationships were observed among amphipod toxicity, pyrethroid insecticides and urban land use. Using a toxic unit approach, we demonstrate increased potential for pyrethroid-driven toxicity statewide over the last 15 years. Significant relationships between standard toxicity test results and pyrethroid toxic units were identified. Out of eight measured pyrethroid pesticides, bifenthrin accounted for about 50 % of the calculated toxic units, and its concentrations significantly increased at nearly 25 % of SPoT monitoring sites. Decreased amphipod survival was significantly associated with urban land use, as were elevated concentrations of pyrethroids. Based on amphipod survival data, 72 % of toxic samples had more than one pyrethroid toxic unit indicating pyrethroid-driven toxicity. Diagnostic testing at an environmentally relevant temperature provided further evidence for pyrethroid contributions to observed toxicity.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180330"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Significant spatiotemporal shifts of land cover over the Mongolian Plateau through the past three decades","authors":"Hidayat Ullah ,&nbsp;Xue Wang ,&nbsp;Shawkat Ali ,&nbsp;Delong Kong ,&nbsp;Xiaopeng Wang ,&nbsp;Shanshan Yang ,&nbsp;Jiahua Zhang","doi":"10.1016/j.scitotenv.2025.180364","DOIUrl":"10.1016/j.scitotenv.2025.180364","url":null,"abstract":"<div><div>Land cover (LC) change is a crucial indicator reflecting the interaction between human activities and ecological environment. In semi-arid and arid regions like the Mongolian Plateau (MP), LC change analysis is particularly meaningful in shaping biodiversity, agricultural and grassland environment, and climate regulation, but long-term spatiotemporal dynamics of LC change in MP remain uncertain. This study employed an intensity analysis approach to investigate LC changes over the MP from 1990 to 2020 by using a fine-scale 30 m resolution land cover dataset generated from multi-source satellite images. The results indicate that LC types including desert steppe and croplands exhibit aggressive expansion in MP region, while key categories such as shrub, wetland, sand, and some grassland types, especially meadow steppe, experience considerable loss in the time frame. Notably, forest cover remained a relatively stable category over the study period. The dominant LC transitions between categories show that meadow steppe lost more than 40 % of its area to real steppe during most of the study period, along with significant shifts from shrub to real steppe, desert steppe, cropland, and bare area. The LC changes on the MP were significantly high during 1990 to 2000, while 2015–2020 records the lowest rates of change. The research provides valuable insights into LC dynamics in MP in long-term, offering essential information for policy-making and sustainable agricultural and grassland development in ecologically fragile areas.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180364"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unveiling amending properties of biosolids from constructed wetland systems: a comparative study","authors":"Ana Cano-Larrotta ,&nbsp;Luisa Massaccesi ,&nbsp;Enrica Uggetti ,&nbsp;Mirko Cucina","doi":"10.1016/j.scitotenv.2025.180365","DOIUrl":"10.1016/j.scitotenv.2025.180365","url":null,"abstract":"<div><div>Climate change and intensive farming have caused soil degradation and decreased organic carbon stocks. Current research focuses on restoring soil fertility, often through organic amendments. Biosolids stabilized in constructed wetlands (CWs) may serve as an applicable organic amendment, although limited literature exists on their properties. This study evaluated the effectiveness of biosolids as an organic amendment and compared them with other amendments such as biochar, compost, microalgae, and digestate. Over six months, a microcosm experiment with clay-loamy soil examined soil organic matter (SOM) dynamics, organic carbon and nitrogen distribution in pools, and microbial activity. Results indicated that biosolids positively affected SOM dynamics, with a low carbon mineralization rate (<em>k</em>: 0.006 d⁻¹). Biosolids significantly increased total organic carbon and total nitrogen stocks in the soil, reaching up to 18.1 Mg·ha⁻¹ and 1.8 Mg·ha⁻¹, respectively. They also enhanced stable and recalcitrant organic carbon fractions by up to 48 % and 57 %. Furthermore, biosolids improved soil biological fertility by boosting total enzymatic activity and microbial biomass carbon, which increased by 76 % compared to the unamended control at the end of the incubation. Overall, biosolids stabilized in CWs can be effective organic amendments, producing results comparable to other amendments.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180365"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soil erosion resistivity metric for sub-watershed prioritization","authors":"Hamed Beigi ,&nbsp;Seyed Hamidreza Sadeghi ,&nbsp;Mehdi Vafakhah ,&nbsp;Vahid Moosavi ,&nbsp;Michael Maerker","doi":"10.1016/j.scitotenv.2025.180367","DOIUrl":"10.1016/j.scitotenv.2025.180367","url":null,"abstract":"<div><div>Soil erosion is a critical factor in soil and water degradation, necessitating the implementation of effective watershed management strategies to mitigate these impacts. Even with its worldwide importance, little is known about the temporal and spatial pattern of soil erosion, which hinders the creation of focused mitigation strategies. In this regard, this study introduces soil erosion resistivity, a novel metric that assesses temporal stability using the normalized coefficient of variation, to prioritize sub-watersheds in Iran's Shazand Watershed, employing the Revised Universal Soil Loss Equation (RUSLE). Resistivity classified sub-watersheds into five stability categories, including unstable (0.81–1), relatively unstable (0.61–0.8), moderately stable (0.41–0.60), relatively stable (0.21–0.4), and stable (0–0.2). Results showed a declining trend in overall erosion, with a sharp increase in 2018 attributed to extreme rainfall. The mean annual soil erosion was 14.94 t ha⁻¹ y⁻¹, with sub-watersheds 15 and 9 identified as the highest priority for management. Whereas sub-watersheds 5, 6, and 7 were classified as the lowest priority. In contrast, resistivity-based prioritization revealed critical nuances, as sub-watershed 11 (19.07 t ha⁻¹ y⁻¹, relatively unstable) ranked as the highest priority. At the same time, higher-erosion areas (e.g., sub-watersheds 9 and 15) were moderately stable and classified as a secondary priority. Sub-watersheds 2, 18, and 23 also showed statistically significant declines. Unlike conventional soil erosion rate-based approaches, resistivity highlights areas with persistently high erosion, enabling precise conservation targeting. These findings underscore the importance of adopting sustainable practices and prioritizing management efforts in vulnerable regions to effectively mitigate soil erosion.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180367"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A simple and low-cost method using active radio frequency identification to survey the mobility of plastic debris in rivers","authors":"Valentin Chardon ,&nbsp;Gauthier Grimmer ,&nbsp;Romain Wenger","doi":"10.1016/j.scitotenv.2025.180336","DOIUrl":"10.1016/j.scitotenv.2025.180336","url":null,"abstract":"<div><div>Rivers are the main method for plastic debris to be transferred from continental to marine environments. The aim of this study is to test the reliability of a low-cost methodology using active radio frequency identification (RFID) tags developed by the ELA Enterprise to assess travel distance and identify the preferential deposition areas of floating (n = 7) and submerged (n = 7) plastic bottles in a peri-urban river located downstream of the city of Strasbourg (France). Our study shows that the protocol tested is simple to set up, fast (1 h per 1,5 km of river length) and reliable, with a detection return rate of 86 %. Over 39 days, the plastic bottles travelled an average distance of 1100 m, with a maximal travel distance of 2100 m during low-flow conditions. All the tracked plastic bottles were trapped in logjams. With a detection range of up to 80 m, the method can be deployed on small to large European rivers by installing one antenna on each bank. Monitoring can be performed over short periods (weeks to months) to several years through the possibility of programming the tag emission frequency.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180336"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methane from urban river networks: distinct responses of methanogenic pathways to substrate stimulation","authors":"Fei Ye ,&nbsp;Qianying Zhu ,&nbsp;Simone Raposo Cotta ,&nbsp;Xindi Li ,&nbsp;Yu Wang","doi":"10.1016/j.scitotenv.2025.180369","DOIUrl":"10.1016/j.scitotenv.2025.180369","url":null,"abstract":"<div><div>Urban rivers are critical hotspots for methane (CH₄) emissions due to anthropogenic activities. However, the understanding of methanogenic pathways and potential drivers across different urban functional zones remains unexplored. A combination of microcosm experiments and field evaluations was employed to investigate the substrate responses of methanogenic pathways in urban rivers influenced by industrial, residential, and agricultural activities within Guangzhou city, a developed metropolitan area in Southern China. Urban rivers in residential zones showed the highest dissolved CH₄ concentrations (3.2 ± 1.1 μmol L⁻¹), exceeding agricultural and industrial zones by 1.9-fold and 4.9-fold, respectively. Relatively higher methanogenic potential was observed in residential and agricultural zones, with significant activity for hydrogenotrophic (8.4 ± 1.5 μmol CH₄ g_DW⁻¹ h⁻¹) and methylotrophic methanogenesis (11.3 ± 8.8 μmol CH₄ g_DW⁻¹ h⁻¹) following H₂/CO₂ and trimethylamine amendment, respectively. Continuous amendments of H₂/CO₂ and trimethylamine markedly enhanced CH₄ production in river sediments across all zones, highlighting the effects of the constant supply of available organic substrates. The addition of glucose enhanced CH₄ production in a mixed sample composed of sediments from the three zones. This enhancement can be attributed to the stimulation of carbohydrate metabolism, which generated key substrates that supported both acetoclastic and hydrogenotrophic methanogenesis pathways. Overall, this study highlights the divergence of CH₄ production in urban rivers across functional zones due to differential organic pollution inputs. Optimizing urban functional zoning management, such as prioritizing advanced wastewater treatment in residential zones and implementing controlled fertilizer runoff in agricultural zones, emerges as a key actionable strategy to mitigate urban river CH₄ emissions amid ongoing urbanization.</div></div>","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":"999 ","pages":"Article 180369"},"PeriodicalIF":8.0,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}