Journal of Environmental Management最新文献

{"title":"Selective nitrogen removal in constructed wetlands enhanced by MnX-GAC (X=Fe or Zn): Performance, mechanism and removal pathway","authors":"Deliang Chen ,&nbsp;Xianwen Fang ,&nbsp;Lu Zhao ,&nbsp;Aoli Cao ,&nbsp;Yu Hou ,&nbsp;Guoxian Yang ,&nbsp;Sen Wang ,&nbsp;Maomao Li ,&nbsp;Fanlong Kong","doi":"10.1016/j.jenvman.2025.125890","DOIUrl":"10.1016/j.jenvman.2025.125890","url":null,"abstract":"<div><div>Constructed wetlands (CWs) are widely used to treat wastewater containing nitrogenous due to their low energy consumption, low maintenance costs, and significant ecological benefits. However, they face challenges such as low denitrification efficiency and greenhouse gas emissions during treatment. Enhancing the synergistic performance of the “substrate-microorganism” system within CWs is considered an effective way to address these problems. Granular activated carbon-supported Mn-based composite fillers (MnX-GAC, X = Fe or Zn) were prepared and placed in the upper and lower positions of the CW. Mn and Fe within these fillers act as electron acceptors or donors to enhance nitrogen removal and reduce nitrous oxide (N₂O) emissions. MnX-GAC boosted microbial interspecies electron transfer and improved the total nitrogen removal efficiency to 77.1 %. Moreover, the CW with MnX-GAC reduced N₂O emissions during the denitrification process and increased nitrogen (N₂) selectivity by 43.4 % compared with the control. The addition of MnX-GAC enhanced microbial interspecies electron transfer by stimulating microorganisms to secrete more protein and increasing their Cytochrome <em>c</em> content. Macrogenomic analyses revealed that MnX-GAC increased the abundances of denitrifying microorganisms (<em>Anaerolinea</em> and <em>Thauera</em>), conducive to nitrogen removal, extracellular polymeric substance secretion or aggregation, and nitrite nitrogen (NO₂⁻-N) reduction to N₂. In the nitrogen transformation pathway, MnX-GAC increased the abundance of functional genes related to nitrification (<em>amoABC</em>, <em>nxrAB</em> and <em>hao</em>), denitrification (<em>napABC</em>, <em>narGHI</em>, <em>nirKS</em>, <em>norBC</em> and <em>nosZ</em>) and anaerobic ammonia oxidation (<em>hzsABC</em> and <em>hdh</em>), resulting in high nitrogen removal and selectivity towards N₂. In this study, MnX-GAC showed excellent performance in selective nitrogen removal in CWs, providing a new strategy to improve the performance of wastewater treatment in CWs and reduce the emission of greenhouse gases.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125890"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 the potential phosphorus retention effect in small-scale cascade reservoir systems: evidence from the Weiyuan River","authors":"Yuepeng Yin ,&nbsp;Wen Zhang ,&nbsp;Wangcheng You ,&nbsp;Anqi Guo ,&nbsp;Qiang Xu","doi":"10.1016/j.jenvman.2025.125847","DOIUrl":"10.1016/j.jenvman.2025.125847","url":null,"abstract":"<div><div>The construction of artificial dams profoundly alters nutrient dynamics within reservoir systems, with the phosphorus (P) retention effect of large reservoirs well-established. However, the role of small cascade reservoirs in regulating P transport dynamics remains poorly characterized, and whether their biogeochemical impacts align with those of large-scale reservoirs requires systematic investigation. Traditionally, it is widely believed that reservoir systems retain P, preventing their export downstream and thereby reducing primary productivity downstream of the reservoir. Unexpectedly, our research on the Weiyuan River cascade reservoirs revealed elevated sediment total P (TP) levels of 1208.93 mg/kg, bioavailable P (BAP) at 623.14 mg/kg, and 0.23 mg/L of TP in the overlying water of downstream reservoirs, indicating that P gradually accumulates into a hotspot along the downstream path of the cascade reservoir, especially during the low-water season (LWS). P dynamics within cascade reservoir systems are primarily driven by three interconnected factors: (1) enhanced sediment P remobilization risks in downstream reaches, (2) anthropogenic P loading from external sources, and (3) cascade-induced sedimentological shifts toward elevated organic matter content and finer particle size distributions, which collectively amplify P bioavailability through modified adsorption-desorption equilibria. Notably, the combined effect of elevated P loading (0.17 mg/L) and prolonged hydraulic retention time (HRT: 13.13 days) during low-water seasons triggered pronounced P sequestration in upstream suspended solids (SS) of cascade reservoirs, retaining 30.35 kg (15.73 % of sediment TP). This far exceeds the P transport observed during the high-water season (HWS), where an increase of 34.34 kg (36.69 %) was recorded downstream. The observed sediment retention during LWS exhibits inconsistencies with reservoir-scale P biogeochemical dynamics, potentially driven by the limited P buffering capacity of small cascade reservoirs under hydrological perturbations and shortened sediment residence times. The study results challenged the conventional belief that a singular reservoir is greatly responsible for P retention, which underscores the importance of monitoring P pollution in areas downstream of cascade reservoirs. Our research offers new insights into how river dams affect nutrient cycling and ecosystem functions, aiming to provide theoretical guidance for river management.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125847"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Assessing ozone pollution and climate change impacts on winter wheat: flux modeling vs. dose-response modeling","authors":"Xiaochen Zhu ,&nbsp;Hengxin Dong ,&nbsp;Yawen Huang ,&nbsp;Wei Ren","doi":"10.1016/j.jenvman.2025.125767","DOIUrl":"10.1016/j.jenvman.2025.125767","url":null,"abstract":"<div><div>Surface ozone is a phytotoxic pollutant that damages photosynthetic systems, reduces gas exchange, retards vegetation growth, and decreases yield. In this study, we developed a new ozone flux module within an agroecosystem model framework to enhance our ability to understand, measure, and predict the impact of surface ozone on agricultural productivity. The new module was calibrated and evaluated against historical observational data from multiple sites. It was then applied to predict winter wheat yield and gross primary productivity (GPP) in response to future ozone changes under different climate scenarios. The new ozone flux model was more sensitive to ozone concentration changes than the ozone dose-response model, demonstrating greater GPP and yield losses at the same ozone pollution level. We also investigated several key environmental factors (temperature, precipitation, carbon dioxide) and their synergistic effects with and without ozone to explore the complexity of ozone pollution impacts under climate change. The simulation results indicate a worsening food crisis, driven by interannual trends in crop losses from ozone pollution under high- and moderate-emission scenarios. A more accurate understanding and qualification of ozone's effects on crop growth and yield is essential for safeguarding food security.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125767"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Intensified human activities shape the dynamics of sediment organic matter in a highly-disturbed estuary","authors":"Jia Yang ,&nbsp;Yunchao Wu ,&nbsp;Bowen Shang ,&nbsp;Jinglong Li ,&nbsp;Pengju Li ,&nbsp;Ling Zhang ,&nbsp;Zhijian Jiang ,&nbsp;Songlin Liu ,&nbsp;Xiaoping Huang ,&nbsp;Ding He","doi":"10.1016/j.jenvman.2025.125852","DOIUrl":"10.1016/j.jenvman.2025.125852","url":null,"abstract":"<div><div>Human activities have significantly altered organic matter dynamics in marine sediments. However, the long-term consequences of these alterations on organic matter within estuarine environments remain ambiguous. This study examines the sustained sediment organic matter (SeOM) dynamics in the anthropogenically disturbed Pearl River Estuary (PRE) spanning terrestrial (T), fresh-seawater mixing (M), and marine (S) zones, with an emphasis on the effects of human activities. Sediment cores (²¹⁰Pb) were utilized to analyze physicochemical parameters, including total organic carbon (TOC), total nitrogen (TN), isotopic compositions (δ¹³C and δ¹⁵N), and fluorescence signatures of sediment dissolved organic matter, which includes humic-like components (C1, C2, and C3) and protein-like components (C4, C5, and C6). The results reveal that within the T zone, total organic carbon (TOC: 0.79∼1.22 %), total nitrogen (TN: 0.081∼0.123 %), and δ¹⁵N values (4.03∼6.60 ‰) exhibited an increasing trend, while δ¹³C values (−24.89 ∼ −24.57 ‰), C1 content (28.97∼32.64 %), and humification index (HIX: 0.60∼0.83) displayed a decreasing trend. These patterns collectively indicate a decline in terrestrial organic matter inputs and a concurrent rise in contributions from anthropogenic sources, such as domestic wastewater discharge. In the M zone, TOC content (0.67∼1.14 %) and TN content (0.07∼0.10 %) exhibited a decrease trend; however, the gradual reduction in the C/N ratio (9.94∼12.38) implies a slower decline in TN relative to organic carbon. Furthermore, C1 content (20.43∼28.69 %), C6 content (0.42∼30.35 %), and HIX value (0.51∼0.78 %) diminished after 1980, indicating a decrease in terrestrial sources and a substantial increase in anthropogenic influence. In the S zone, the C/N ratio (7.71∼8.77) remained relatively stable prior to 1980; however, a significant decline in terrestrial inputs was noted after 1980, particularly following 2000. Human-induced terrestrial alterations and domestic discharge have a substantial impact on the preservation of SeOM within the PRE, particularly in the T and M zones. The increase in Fe (III) within the T zone significantly enhances the content of SeOM; however, intensified anthropogenic activities compromise its preservation capacity. This study offers critical insights into the dynamics of SeOM within a significantly disturbed estuary over the past four decades, underscoring the potential effects of intensified human activities on the preservation of SeOM in estuarine ecosystems.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125852"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Surface water and groundwater interactions contributed the seasonal NO3− and NH4+ sources and transformations in a hilly region, China","authors":"Jun Wang ,&nbsp;Yuan Niu ,&nbsp;Chang Li ,&nbsp;Zian Liu ,&nbsp;Xia Jiang ,&nbsp;Yali Wu","doi":"10.1016/j.jenvman.2025.125750","DOIUrl":"10.1016/j.jenvman.2025.125750","url":null,"abstract":"<div><div>Comprehensive understanding of nitrogen (N) sources and transformations under the interactions of variable water cycle processes were of great significance for formulating nitrogen mitigation strategies in aquatic systems. Multiple stable isotopes (δ¹⁵N-NO₃^-, δ¹⁸O-NO₃^-, δ¹⁵N-NH₄⁺, δ²H-H₂O, and δ¹⁸O-H₂O) and hydrochemical characteristics in surface water (SW) and groundwater (GW) were to reveal seasonal NO₃⁻ and NH₄⁺ sources and transformations in a hilly region with frequent vertical movements in this study. The δ²H-H₂O, δ¹⁸O-H₂O, and hydrochemical analysis highlighted surface water and groundwater interactions. The correlation between δ¹⁵N-NO₃^- and d-excess demonstrated soil leaching. Nitrification was the predominant nitrogen transformation process in the watershed during both seasons although denitrification occurred in certain points. Primary source of NO₃⁻ in SW was soil nitrogen (SN; 34.5 ± 14.9 % in the dry season and 76.4 ± 8.1 % in the wet season). The contributions of various sources to NH₄⁺ in SW were relatively equal during the dry season, while GW (30.5 ± 19.3 %) and manure and sewage (M&amp;S) (29.0 ± 15.2 %) were the primary sources during the wet season. This study proved that groundwater was a significant source for NO₃⁻ and NH₄⁺ input when utilizing source-track models, especially in hilly regions. These findings improve input sources for mixture models and identify the sources and transformations of water cycling and N biogeochemical processes.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125750"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Relationships among multiple ecosystem services in mountainous regions: A case study of the Gaoligong Mountains","authors":"Jingjing Yang ,&nbsp;Zhe Chen ,&nbsp;Wenfu Zhang ,&nbsp;Guangtao Meng ,&nbsp;Min Cao ,&nbsp;Jiahua Li ,&nbsp;Congli Xu ,&nbsp;Ruidong Wu ,&nbsp;Hongtian Leng ,&nbsp;Qingzhong Wen ,&nbsp;Jie Yang ,&nbsp;Guorui Xu","doi":"10.1016/j.jenvman.2025.125765","DOIUrl":"10.1016/j.jenvman.2025.125765","url":null,"abstract":"<div><div>Understanding the drivers and ecological implications of trade-offs and synergies among ecosystem services (ESs) is essential for sustainable mountain management. While previous studies have mapped ES relationships, the mechanisms underpinning their spatial heterogeneity in coupled human-natural systems remain underexplored. Here, we integrated gradient-based approaches to assess the distribution patterns of four ESs—water yield (WY), carbon storage (CS), net primary productivity (NPP), and habitat quality (HQ)—in the transboundary Gaoligong Mountains from 2001 to 2020. We found that: (1) Process-based services (WY-NPP) exhibited strong trade-offs, driven by climatic constraints and plantation expansion on southern slopes, where monoculture forests enhanced NPP but reduced infiltration capacity; (2) Synergies between structure-based services (CS-HQ) dominated mid-elevation forests, reflecting the dual role of conserved evergreen broadleaf forests in sequestering carbon and sustaining biodiversity through environmental conditions, complex canopy structures, and minimal human disturbance. Human activities disrupted natural synergies, as CS-HQ relationships shifted to trade-offs in high-intensity zones (e.g., cropland fragmentation and invasive species spread), highlighting conflicts between short-term provisioning and long-term regulating services; (3) Elevation gradients further shaped these dynamics: mid-elevation zones maintained balanced ecosystem service provision, while low-elevation agricultural areas experienced dual declines in net primary productivity (NPP) and habitat quality (HQ) due to cultivated land fragmentation, creating a trade-off between these services. This study contributes significantly to our understanding of ESs and intricate relationships within mountainous regions across temporal and spatial gradients. Our findings underscore the need to prioritize mid-elevation conservation corridors and adaptive agroforestry, providing valuable insights for decision-making processes in transboundary ecosystem conservation.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125765"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Encapsulation techniques of sludge generated from wastewater treatment","authors":"Devvrat Dhiman ,&nbsp;Avneesh Anshul","doi":"10.1016/j.jenvman.2025.125788","DOIUrl":"10.1016/j.jenvman.2025.125788","url":null,"abstract":"<div><div>Human civilization's progress, along with the linear economy approach, is leading us toward major environmental and economic challenges. Industrial waste, one of these challenges, has always been a topic of research and development. Encapsulation is a method that offers a promising implementation of waste and reutilizing it as a resource in a value-added product while immobilizing toxic components such as heavy metals. Focusing on sludge, the review studies its classification, composition, and challenges associated with conventional methods such as landfills, incineration, etc. The study delves into the types of encapsulation that are micro-, macro-, and nano-encapsulation and highlights their recent advancements emphasizing their effectiveness in immobilizing the heavy metals while improving the structural properties of the product. Although encapsulation is mostly studied in food and pharmaceutical industrial applications, its application in sludge management remains unexplored. The study focuses on the recent advancements in sludge encapsulation and identifies geopolymerization and alkali-activation methods as emerging technologies. The results highlight that 5–10 % of sludge can be used to make construction material without losing its mechanical properties while encapsulating heavy metals up to 99 %. Compared to the earlier work done, this review provides a framework to evaluate the role of encapsulation. Considering waste as a resource and reutilizing it into a product strengthens the application of the circular economy concept. Seeing it as a possible environmentally sustainable way, the review also draws attention to the potential and scope of encapsulation in waste management by identifying the current research gaps and trends.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125788"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Developing and validating a modelling approach linked with ion selective electrodes to control pollution of water resources from greenhouse crops","authors":"Evangelos Giannothanasis ,&nbsp;Juan Cedeño ,&nbsp;Georgia Ntatsi ,&nbsp;Rodney B. Thompson ,&nbsp;Dimitrios Savvas","doi":"10.1016/j.jenvman.2025.125792","DOIUrl":"10.1016/j.jenvman.2025.125792","url":null,"abstract":"<div><div>The recycling of drainage solution (DS) in greenhouses by applying closed-loop soilless cropping systems (CLS) eliminates pollution of aquifers by nitrogen and phosphorus emissions. However, the variable nutrient composition of the DS poses a significant challenge to its recycling in CLS. To addresses this challenge, a strategy was developed, based on daily monitoring of macronutrient concentrations in the DS using ion-selective electrodes (ISE) coupled with a modelling approach applied through a decision support system (DSS). The ISE measurements were input data for the DSS to calculate appropriate rates of different single-fertiliser concentrated solutions for automatic injection into a mixture of DS and raw water. The fertiliser injection rates were transmitted online to a fertigation system equipped with nine different single-fertiliser concentrated solutions and were applied automatically in real time. The objective was to maintain the root-zone nutrient concentrations within an optimal range. To test this technology and to validate the modelling approach applied through this DSS, tomato was grown in a CLS with daily measurement of NO₃⁻, K⁺, Ca²⁺, and Na⁺ concentrations in the DS using ISEs. The accuracy of the ISEs was confirmed by comparing their measurements with those from standard laboratory procedures in the same samples. The model approach successfully maintained the target nutrient concentrations in the root zone and increased fruit yield by 7.6 % and the agronomic efficiency of nitrogen by 23 %. The proposed technology is expected to encourage the adoption of CLS by growers thus minimising environmental impacts from greenhouse crops.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125792"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Adaptive management of shrub-encroached woodlands: assessing the short-term impact of alternative mastication techniques on fuel and biodiversity","authors":"Jamie E. Burton,&nbsp;Bianca J. Pickering,&nbsp;Kate A. Parkins,&nbsp;Matthew H. Swan,&nbsp;Trent D. Penman,&nbsp;Jane G. Cawson","doi":"10.1016/j.jenvman.2025.125864","DOIUrl":"10.1016/j.jenvman.2025.125864","url":null,"abstract":"<div><div>Woody shrub encroachment is a growing problem in many ecosystems across the globe, causing declines in biodiversity and elevated fire risk. Mastication can be used to remove the dense shrub layer, however decisions regarding the optimal mastication technique are hampered by a lack of information about how different mastication techniques influence fuel, vegetation structure and floristic composition. We applied an adaptive management approach to trial various mastication techniques. The trial was co-designed with land managers and conducted in eucalypt woodlands of southeastern Australia which have a dense understorey of Coast Wattle (<em>Acacia longifolia</em> var. <em>sophorae</em>). We tested two techniques, a high intensity (greater mechanical processing) and low intensity (less mechanical processing) treatment. We measured surface fuel, vegetation structure and floristic diversity pre-mastication, then 1-, 6- and 12-months post-mastication. The high intensity technique produced higher surface fuel loads compared to the low intensity technique. By 12-months post-mastication, cover of short (&lt;0.3 m tall) vegetation had recovered to pre-treatment levels, with no difference between techniques. Both techniques yielded higher native species richness and diversity than the control, driven mainly by increases in native forb species. The low intensity technique was faster and less expensive and had similar impacts on floristic diversity but had lower surface fuel load. Therefore, we recommend the application of the low intensity technique to manage shrub encroachment. Our study used adaptive management to understand the short-term (1-year) impacts of different mastication techniques. Future trials (with additional treatments) and ongoing monitoring are planned to further improve our understanding of how to best to manage shrub encroachment.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125864"},"PeriodicalIF":8.0,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Biochar-based fertilizer enhances carbon neutrality and net ecosystem economic benefit in tobacco (Nicotiana tabacum L) production","authors":"Fanghu Sun ,&nbsp;Xiaopeng Deng ,&nbsp;Ying Jiao ,&nbsp;Jie Li ,&nbsp;Jun Li ,&nbsp;Huiying Xing ,&nbsp;Wenjie Tong ,&nbsp;Erdeng Ma ,&nbsp;Yali Zhang ,&nbsp;Zhengqin Xiong","doi":"10.1016/j.jenvman.2025.125862","DOIUrl":"10.1016/j.jenvman.2025.125862","url":null,"abstract":"<div><div>Biochar has great potential to advance carbon neutrality and net ecosystem economic benefit (NEEB), dual priorities critical for global sustainability. Nevertheless, scarce studies have comprehensively assessed the carbon footprint and NEEB based on life cycle assessment (LCA) as well as field crop production. An integrative investigation of five strategies was set up through field experiments: (1) chemical compound fertilizer (CF), (2) biochar-based fertilizer (BF), and (3–5) biochar application rates of 10 (NB10), 20 (NB20), and 30 (NB30) t ha⁻¹ with equal nitrogen inputs in a typical tobacco field with no N fertilizer or biochar as CK. The results demonstrated that biochar amendments (NB10, NB20, and NB30) achieved dose-dependent net negative carbon footprint although they intensified N₂O emissions by 118.7–321.7 % (p &lt; 0.05) as compared with the CF. Moreover, the NB10 strategy reconciled environmental-economic objectives with better NEEB, but the NB20 and NB30 strategies depressed NEEB despite achieving carbon negativity. Importantly, the BF strategy optimally increased NEEB (by 3.9 %, p &lt; 0.05), improved tobacco quality (by 13.9 %), and decreased the carbon footprint (by 22.1 % and 25.9 % on the yield-scaled and income-scaled, respectively, p &lt; 0.05) compared to the CF. Energy consumption was the primary contributor to carbon emissions, accounting for 69.1–83.1 % among all sources based on the LCA framework. Thus, biochar-based fertilizer and optimized biochar amendment strategies lowered the carbon footprint and enhanced NEEB for sustainable production, surpassing conventional local practices.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"387 ","pages":"Article 125862"},"PeriodicalIF":8.0,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}