Ecohydrology & Hydrobiology最新文献

{"title":"Biological removal of bisphenol A using cross-linked aggregates of versatile peroxidase (CLEAs-VP/Ba) produced by Bjerkandera adusta CCBAS 930","authors":"Kamila Rybczyńska-Tkaczyk","doi":"10.1016/j.ecohyd.2025.100669","DOIUrl":"10.1016/j.ecohyd.2025.100669","url":null,"abstract":"<div><div><span>The aim of this study was to evaluate the feasibility of using cross-linked aggregates of versatile peroxidase (CLEAs-VP/Ba) derived from </span><span><span>Bjerkandera adusta</span></span><span><span><span> strain CCBAS 930 for bisphenol A (BPA) </span>biotransformation. To optimize VP/Ba </span>biosynthesis<span> in stationary liquid cultures (28 °C), BPA (40 mg/mL) was added, and oxidation efficiency of 10 mM 2,6-dimethoxyphenol (2,6-DMP) was measured at various intervals (days 3, 7, 10, 14, 18, 20, and 26). The tests were conducted in 0.1 M acetate buffer at pH 3.0 and 5.0, with and without Mn</span></span>²⁺<span><span>. Maximum activity for VP/Ba was determined on day 14, after which the culture fluid was separated from the mycelium and </span>ammonium sulfate<span> (80 %) and 72 mM glutaraldehyde was added to prepare CLEAs-VP/Ba (22 h, 150 rpm, 30 °C). The activity recovery (AR</span></span>_CLEAs-VP/Ba) and aggregation yield (AY_CLEAs-VP/Ba) were 11.65 % and 48.95 %, respectively. The BPA (10 mg/L) removal efficiency of CLEAs-VP/Ba and 10 mM H₂O₂<span><span><span> was measured spectrophotometrically after 30, 60, 90 and 120 min. Results showed that CLEAs significantly increased the activity of VP/Ba </span>peroxidase, achieving an 83 % BPA removal efficiency after 120 min (4.15 mg/h). Moreover, CLEAs-VP/Ba-treated samples exhibited reduced biotoxicity, with no observed </span>phytotoxicity<span>. The treatment also mitigated long-term adverse effects, such as genotoxicity. In case of estrogenic activity, no significant decrease was observed after the use of CLEAs-VP/Ba.</span></span></div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100669"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Temperature-driven nonlinear thresholds and time-lags in vegetation response to extreme climate events via machine learning: Evidence from China's Poyang Lake","authors":"Fangfei Zhang ,&nbsp;Wei Yang ,&nbsp;Dongdong Shao","doi":"10.1016/j.ecohyd.2025.100685","DOIUrl":"10.1016/j.ecohyd.2025.100685","url":null,"abstract":"<div><div>Understanding how extreme climate events impact vegetation dynamics is crucial for ecosystem resilience assessment and adaptive management, but existing research has yet to fully explore the intricate mechanisms governing vegetation responses to climate extremes. Using Poyang Lake as a case study, we assess spatiotemporal variations in NDVI over periods from 2000 to 2020, and examine effects of 23 extreme climate indices (including rainfall and temperature metrics) on vegetation dynamics, considering lagged and cumulative effects. Nine temporal effect scenarios were evaluated to clarify the complex relationships between extreme climate events and vegetation responses. Our results indicate that the NDVI in the Poyang Lake region increases significantly, with a mean growth rate of 0.037 per decade (<em>p</em> &lt; 0.01). Extreme temperature indices exhibited the strongest correlations with vegetation response, with peak correlation observed at one-month accumulation periods, while for most extreme precipitation indices, vegetation responses were stronger with accumulated effects over 2–3 months than with simple lag effects. Temperature-related indices were clearly dominant in the explainable models, with monthly minimum value of daily minimum temperature (TNn) being the most influential factor, accounting for approximately 23 % of the explained variance. SHapley Additive exPlanations (SHAP) value analysis revealed a pronounced non-linear threshold effect: NDVI increased sharply as TNn rose from 0 °C to 12 °C, then stabilized at higher values, which indicates that cold stress represents a major constraint on vegetation growth with a clear physiological threshold. These findings underscore critical need for a more comprehensive and explicit depiction of how climate extremes influence vegetation.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100685"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Structural and functional responses of Panicum antidotale to diverse ecohydrological conditions","authors":"Muhammad Irshad ,&nbsp;Mansoor Hameed ,&nbsp;Farooq Ahmad ,&nbsp;Ummar Iqbal ,&nbsp;Jazab Shafqat ,&nbsp;Ansa Asghar","doi":"10.1016/j.ecohyd.2025.100686","DOIUrl":"10.1016/j.ecohyd.2025.100686","url":null,"abstract":"<div><div>Understanding plant–water relationships is vital for managing ecosystems under escalating hydrological stress. <em>Panicum antidotale</em> (a C₄ perennial grass) exhibits significant phenotypic plasticity, making it a suitable model for assessing structural and functional adaptation across ecohydrological gradients. This study evaluated eight natural populations from freshwater ponds, irrigation canals, riverbanks, and sewerage channels in Punjab, Pakistan. Results revealed that irrigation canal populations (CW, KP) exhibited maximum plant height, leaf number, and leaf area, reflecting a growth-acquisitive strategy supported by high chlorophyll <em>b</em> and carotenoid content. Freshwater pond populations (BS, BC) also followed an acquisitive model, with elevated chlorophyll a, large bulliform cells, and moderate growth, prioritizing photosynthetic efficiency under stable conditions. In contrast, sewerage populations (SA, TSP) adopted a conservative strategy, with stunted shoot growth but enhanced root elongation, thickened sclerenchyma and epidermis, and increased levels of osmolytes (proline, glycine betaine), antioxidants (ascorbic acid, CAT, POD), and oxidative stress markers (H₂O₂, MDA)—indicating investment in defense and stress tolerance over productivity. Riverbank populations (RA, RR) displayed an intermediate strategy, with the highest shoot biomass, midrib and lamina thickness, phloem area, and stomatal density—traits that aid in gas exchange, hydraulic conductivity, and structural support in dynamic flood-prone environments. Anatomically, these populations also showed well-developed vascular systems and thickened leaf structures, contributing to both ecological persistence and hydrological functionality. These specific adaptations support resource allocation theory and position <em>P. antidotale</em> as a candidate for ecological restoration, erosion control, and water quality improvement.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100686"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"River modifications and brown trout: It’s not all bad news","authors":"Luděk Šlapanský ,&nbsp;Michal Janáč ,&nbsp;Pavel Jurajda ,&nbsp;Kevin Roche ,&nbsp;Michal Hnilička","doi":"10.1016/j.ecohyd.2025.100701","DOIUrl":"10.1016/j.ecohyd.2025.100701","url":null,"abstract":"<div><div>Channelisation and other river modifications are widely believed to have a negative impact on aquatic biota. In recent years, significant resources have been invested into river restoration projects; however, their success often remains uncertain. The brown trout (<em>Salmo trutta</em>), with its specific environmental requirements, is considered particularly vulnerable to river modification and, as such, is often seen as a flagship species for many river restoration efforts. The 59 km Vsetínská Bečva, a small sub-montane river in eastern Czech Republic, supports a thriving trout population, despite being heavily modified. This provided an opportunity to study the effects of different river modification types on different cohorts of the trout population. While modified river stretches with deepened channels and boulder-stabilised or undercut banks appeared to support age 3+ trout, this cohort was almost absent from stretches modified by river widening. In general, while the occurrence of age-1 trout increased with the proportion of areas with depths below 40 cm, age-3+ trout increased with the proportion of areas with depths ≥ 40 cm, especially when accompanied by undercut banks. From the viewpoint of trout population management, our results suggest a re-evaluation of the negative impacts of river modifications may be needed, with studies considering the potential for positive contributions alongside their known negative ecological effects.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100701"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Macroinvertebrate functional responses to human disturbance and flow cessation in Afromontane-savannah rivers","authors":"Christine A.A. Owade ,&nbsp;Horst Kaiser ,&nbsp;Gelas M. Simiyu ,&nbsp;Godfrey Owuor ,&nbsp;Evans Sicharani ,&nbsp;Gretchen M. Gettel ,&nbsp;Frank O. Masese","doi":"10.1016/j.ecohyd.2025.100649","DOIUrl":"10.1016/j.ecohyd.2025.100649","url":null,"abstract":"<div><div>Wildlife, people, and livestock rely on riverine ecosystems in arid and semi-arid areas as primary water sources. Studies on the influence of human activities and livestock on the ecological health of these seasonal systems are thus necessary. This is more relevant given the increasing demand for water as human populations grow, which leads to over-abstractions and, sometimes, cessation of flows in streams and rivers during the dry periods. Although the structural composition of macroinvertebrate communities has been utilized to indicate the ecological integrity of streams and rivers, macroinvertebrate functional feeding groups (FFGs) are less studied, especially in intermittent Afrotropical streams. We used macroinvertebrate FFGs as indicators of water quality and ecological integrity of streams influenced by different levels of human disturbance and flow variability in the Afromontane-savanna Bura and Wundanyi rivers in Taita Taveta County, Kenya. A total of 18 sampling sites were identified for sampling and grouped into three (3) disturbance categories (low– <em>n</em> = 7, moderate - <em>n</em> = 4, and disturbed - <em>n</em> = 7) and two categories of flow permanence (permanent – <em>n</em> = 9, and seasonal – <em>n</em> = 9). At each site, sampling of physicochemical water quality parameters and macroinvertebrates was done twice during the wet and dry seasons. Ratios of five FFGs (collector-gatherers, collector-filterers, scrapers/grazers, predators, and shredders) were used to derive five metrics that are surrogates of ecosystem attributes in the rivers. There was a significant difference (<em>p</em> &lt; 0.05) in the concentrations of dissolved organic carbon, total phosphorus, pH, and electrical conductivity between the three site categories. Seasonal sites recorded higher electrical conductivity and total dissolved solids compared to permanent streams. Total suspended solids and particulate organic matter were higher during the dry season. FFGs responded to the disturbance gradient, seasonality, and flow variability in the study area with high numbers of predators and scrapers during dry season, suggesting that the human disturbance influenced the functional composition of macroinvertebrates in the rivers. The findings also show that flow variability (seasonal vs flow permanence) played a important role in structuring communities and determining ecosystem functioning. Therefore, in addition to general human disturbance, there is also a need to study the impact of excessive water withdrawals or changes in natural flow regimes of streams and rivers on aquatic communities and the development of indices to assess their effects.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100649"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Monsoon decline versus summertime intensification of carbon and nitrogen fixation in a shallow tropical lake","authors":"Ajayeta Rathi ,&nbsp;Siddhartha Sarkar ,&nbsp;Abdur Rahman ,&nbsp;Mohammad Atif Khan ,&nbsp;Sanjeev Kumar","doi":"10.1016/j.ecohyd.2025.100670","DOIUrl":"10.1016/j.ecohyd.2025.100670","url":null,"abstract":"<div><div><span><span><span>In recent years, changes in lake water levels have emerged as a significant environmental concern, largely attributable to the impacts of climate change and </span>anthropogenic activities<span>. Reductions in lake water levels alter light availability, mixing patterns, nutrient concentrations, biomass, and nutrient assimilation rates. Despite being notable contributors to inland water areas, shallow lakes have received comparatively less attention globally and play a significant role in carbon and nitrogen </span></span>biogeochemical cycles<span><span>. This study explores the seasonal influence of water temperature, salinity, and nutrient concentration on </span>phytoplankton<span> primary production<span>, nitrogen assimilation<span><span>, and dinitrogen fixation rates in a shallow tropical freshwater lake as the water level increases from summer to monsoon. Our results reveal that when water level was reduced during summer, concentrations of particulate and dissolved forms of carbon and nitrogen increased, as did </span>phytoplankton primary production, nitrogen assimilation, and N</span></span></span></span></span>₂<span> fixation rates. Higher rates during summer were attributed to increased light availability, temperature, biomass, and nitrogenous nutrient concentrations with reduction in water level. Lower rates during monsoon were due to the dilution of lake water caused by precipitation and runoff resulting in limited biomass and supply of nitrogenous nutrients. This seasonal variation can cascade through trophic levels, affecting primary producers and potentially leading to shifts in community structure and biodiversity. Overall, this study provides valuable insights into the interactions among water level changes, environmental parameters, phytoplankton primary production, nitrogen assimilation, and N</span>₂ fixation rates in tropical semi-arid freshwater shallow lakes facing the threat of lake desiccation.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100670"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Comparison of potential future impacts of climate change on Streamflows in tropical and subtropical watersheds","authors":"Imiya Mudiyanselage Chathuranika ,&nbsp;Dalya Ismael","doi":"10.1016/j.ecohyd.2025.100699","DOIUrl":"10.1016/j.ecohyd.2025.100699","url":null,"abstract":"<div><div>Understanding climate change impacts on watersheds is critical for sustainable water management, ecosystem protection, and resilience planning. This study compares projected streamflow changes in two watersheds: the tropical Upper Nilwala Watershed (UNW), Sri Lanka, and the subtropical Upper James Watershed (UJW), Virginia, USA. Streamflows for both watersheds are simulated using the Hydrologic Engineering Center's Hydrologic Modeling System (HEC-HMS) hydrological model, with future climate projections bias-corrected using the Linear Scaling Method (LSM). The analysis spans three future periods; Near (NF: 2026–2050), Mid (MF: 2051–2075), and Far Future (FF: 2076–2100) against a 1998–2022 baseline period, using ensembles of selected GCM-RCM combinations under medium (Shared Socioeconomic Pathway SSP 2-4.5 (Representative Concentration Pathway RCP 4.5)) and high (SSP 5-8.5 (RCP 8.5)) Emission Scenarios (ESs). Projections show diverging trends: UJW may face annual precipitation declines of 8.19% (SSP 2-4.5 (RCP 4.5)) and 14.63% (SSP 5-8.5 (RCP 8.5)), while UNW could see increases of approximately 10.80%, during 2026-2100 respectively. By 2100, UNW at Pitabeddara may experience up to a 56.53% rise in annual discharge (SSP 2-4.5 (RCP 4.5)), whereas UJW at Holcomb-Rock may see only a 4.16% increase (SSP 2-4.5) or a slight 0.62% decrease (SSP 5-8.5 (RCP 8.5)). Monthly and seasonal flows differ sharply: UNW may rise by 136.7% during the northeast monsoon season, while UJW trends vary gains in summer/autumn, but spring/winter declines up to 12.48%. These contrasts highlight the need for region-specific adaptive strategies, emissions mitigation, and addressing model uncertainties for effective long-term water management.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100699"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Constructed wetlands as post-treatment in Isfahan, Iran: Evaluation with different sizes of natural pumice","authors":"Tayebeh Omidinia-Anarkoli,&nbsp;Mohammad Shayannejad","doi":"10.1016/j.ecohyd.2025.100651","DOIUrl":"10.1016/j.ecohyd.2025.100651","url":null,"abstract":"<div><div><span>Wastewater reuse is a promising solution to the water crisis in Iran, requiring cost-effective and eco-friendly treatment methods. This study evaluated the performance of pilot-scale constructed wetlands (CWs) treating effluent from the Fooladshahr wastewater treatment plant in Isfahan, Iran. Two CW configurations were tested: (1) horizontal subsurface flow CWs (H</span><img>CWs) and (2) hybrid CWs combining horizontal and vertical flow (HV-CWs). Four experimental units were constructed for each configuration (total: 8 CWs). Two pumice particle sizes (P1: 15–30 mm and P2: 3–9 mm) were used as substrates, and the effect of plants (<em>Phragmites australis</em>) was assessed. The mean theoretical hydraulic retention times (HRTs) were 3 days for H<img>CWs and 1.1 days for HV-CWs. CWs with smaller filler sizes generally performed better, reducing total suspended solids (TSS), biochemical oxygen demand (BOD₅), and chemical oxygen demand (COD) by up to 87.72 ± 7.96 %, 70.02 ± 24.72 %, and 69.40 ± 12.70 %, respectively. This improvement is due to enhanced physical and biological treatment. The presence of plants improved BOD₅ and COD removal in CWs with larger filler sizes, increasing efficiency by 20 % in H<img>CWs. Seasonal variations in phosphate (PO₄³) removal were observed, with better removal in warmer periods (44.45 ± 15.57 %), particularly in unplanted CWs with smaller fillers. All CWs achieved over 85 % fecal coliform (FC) removal, with planted CWs using smaller pumice sizes showing the lowest FC concentrations. While smaller filler size HV-CWs showed superior performance, larger planted H<img>CWs provided a cost-effective alternative. Further research is needed to assess long-term performance in various contexts.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100651"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Effects of the global change on the thermal habitat quality for Salmonids within the Upper Soča watershed in Slovenia","authors":"Delphine Nicolas ,&nbsp;Baptiste Testi ,&nbsp;Dušan Jesenšek ,&nbsp;Kim Leban ,&nbsp;Alain J. Crivelli","doi":"10.1016/j.ecohyd.2025.100705","DOIUrl":"10.1016/j.ecohyd.2025.100705","url":null,"abstract":"<div><div>Temporal data series of water temperature collected at various locations in the Upper Soča river basin, a pristine area in Slovenia, from 1996 to 2022, were analyzed to assess any trends as potential effects of the global change. Different temperature metrics were calculated to study more especially eventual impacts on trout species known as present in the target sites: the endemic marble trout (<em>Salmo marmoratus</em>), the introduced common trout (<em>Salmo trutta</em>) and hybrid trout (<em>S. marmoratus x S. trutta</em>). Significant trends were observed in more than half of the streams considered, indicating a general warming of water temperatures across the entire Upper Soča basin. The high regional coherence found for streams in the three watersheds (Soča, Bača and Idrijca) studied suggested regional synchrony and an overall predominant climatic influence. However, a greater variation was observed in spring and summer, suggesting the implications of additional local factors. The majority of the monitored sites (<em>n</em> = 18 out of 25) experienced an increase in the annual mean temperature (+ 0.04 °C per year on average), especially in summer (+0.1 °C per year on average for 19 sites) when flows were lower. Thermal conditions remained favourable for salmonids in all sites. However, temperatures above 15 °C or even 19 °C are expected to be increasingly recorded, enhancing periods with stressful conditions for salmonids, at first for the endemic <em>S. marmoratus</em>.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100705"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Carbon isotopic and geochemical insights into groundwater contamination by landfill leachate","authors":"Giovanna Orletti Del Rey,&nbsp;Luciano Soares da Cunha,&nbsp;Roberto Ventura Santos","doi":"10.1016/j.ecohyd.2025.100682","DOIUrl":"10.1016/j.ecohyd.2025.100682","url":null,"abstract":"<div><div>Landfill leachate is a major source of water resource contamination, especially at sites without engineered liners. Its complex mix of organic and inorganic pollutants poses risks to human health and the environment. When aquifers fail to prevent contaminant migration, plumes form and typically attenuate with distance from the source. The stabilization stage of a landfill influences the isotopic composition of CO₂ produced during organic matter degradation, with δ¹³C signatures serving as effective tracers in aquifers. This study investigates contamination near the Jockey Club of Brasília landfill (JCBL), a 50-year-old decommissioned site in Brazil, using δ¹³C of dissolved inorganic carbon (δ¹³C-DIC) and complementary geochemical indicators. Leachate from JCBL is enriched in heavy carbon isotopes (δ¹³<em>C</em> ≈ +13 ‰), contrasting with δ¹³C-DIC values in local groundwater (∼−12 ‰). Isotopic mass balance suggests that approximately 48 % of the DIC in the shallow aquifer originates from leachate, a conservative estimate given possible effects of methane oxidation. Elevated Fe²⁺ levels also indicate redox-driven mobilization via Fe³⁺ reduction in Fe-rich oxisols. Surface water in the Cabeceira do Valo stream shows lower contaminant levels but cannot be deemed unaffected. The δ¹³C-DIC value in the stream (−9.64 ‰) is enriched relative to deep groundwater, suggesting partial leachate influence. Isotopic modeling estimates that ∼7.9 % of the stream’s DIC derives from leachate carbon, likely through subsurface discharge or mixing with impacted groundwater. These findings confirm the utility of δ¹³C-DIC as a tracer of landfill contamination and underscore the need for strategies to protect vulnerable water resources.</div></div>","PeriodicalId":56070,"journal":{"name":"Ecohydrology & Hydrobiology","volume":"25 4","pages":"Article 100682"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145739107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}