Pub Date : 2025-03-10DOI: 10.1016/j.jenvman.2025.124894
Zhihui Yang , Lin Yu , Xiao Yan , Penggang Li , Mengying Si , Qi Liao , Feiping Zhao , Zhang Lin , Anxu Sheng , Weichun Yang
Humic acid-bound Pb (HA-Pb), as one of the representative solid-associated Pb species, plays important roles in Pb mobility and toxicity in aqueous environments. Stable Pb-phosphate minerals formation mediated by phosphate solubilizing bacteria (PSB) is a promising approach to immobilizing Pb in contaminated waters. However, the underlying processes and kinetics of Pb-phosphate biomineralization from labile HA-Pb species remain unclear. Here, experiments were conducted using dialysis bags to separate PSB Enterobacter Aerogenes W6 cells from HA-Pb and FePO4 solids, and the time-dependent evolutions of solution conditions, PSB metabolites, Pb species, and Pb-phosphate minerals were systematically analyzed. Acid-soluble Pb species (∼25%) in HA-Pb, mainly complexing with phenolic hydroxyl groups, served as the source for Pb-phosphate mineralization. Extracellular secreted small organic acids contributed to Pb solubilization from HA-Pb, while polysaccharide macromolecules played critical roles in promoting Pb-phosphate nucleation on PSB cell surfaces. By coupling time-dependent bacterial growth, an integrated kinetic model was developed and performed well in describing the underlying processes of Pb-phosphate biomineralization, including Pb solubilization from HA-Pb (RMSE<1%), Pb adsorption onto PSB cells (RMSE<20%), and Pb-phosphate mineral precipitation (RMSE<5%). The findings provide insights into the Pb-phosphate biomineralization of solid-associated Pb and could help to predict the fate of Pb in natural and engineering systems.
{"title":"Mechanistic and kinetic understanding of Pb-phosphate biomineralization from humic acid-bound Pb under active growth of phosphate solubilizing Enterobacter aerogenes W6","authors":"Zhihui Yang , Lin Yu , Xiao Yan , Penggang Li , Mengying Si , Qi Liao , Feiping Zhao , Zhang Lin , Anxu Sheng , Weichun Yang","doi":"10.1016/j.jenvman.2025.124894","DOIUrl":"10.1016/j.jenvman.2025.124894","url":null,"abstract":"<div><div>Humic acid-bound Pb (HA-Pb), as one of the representative solid-associated Pb species, plays important roles in Pb mobility and toxicity in aqueous environments. Stable Pb-phosphate minerals formation mediated by phosphate solubilizing bacteria (PSB) is a promising approach to immobilizing Pb in contaminated waters. However, the underlying processes and kinetics of Pb-phosphate biomineralization from labile HA-Pb species remain unclear. Here, experiments were conducted using dialysis bags to separate PSB <em>Enterobacter Aerogenes</em> W6 cells from HA-Pb and FePO<sub>4</sub> solids, and the time-dependent evolutions of solution conditions, PSB metabolites, Pb species, and Pb-phosphate minerals were systematically analyzed. Acid-soluble Pb species (∼25%) in HA-Pb, mainly complexing with phenolic hydroxyl groups, served as the source for Pb-phosphate mineralization. Extracellular secreted small organic acids contributed to Pb solubilization from HA-Pb, while polysaccharide macromolecules played critical roles in promoting Pb-phosphate nucleation on PSB cell surfaces. By coupling time-dependent bacterial growth, an integrated kinetic model was developed and performed well in describing the underlying processes of Pb-phosphate biomineralization, including Pb solubilization from HA-Pb (RMSE<1%), Pb adsorption onto PSB cells (RMSE<20%), and Pb-phosphate mineral precipitation (RMSE<5%). The findings provide insights into the Pb-phosphate biomineralization of solid-associated Pb and could help to predict the fate of Pb in natural and engineering systems.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"379 ","pages":"Article 124894"},"PeriodicalIF":8.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580774","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}
Flowering and fruiting phenology can have large impacts on a plant's reproductive success. In many plant species, these phenological events are controlled by seasonal climatic cues, resulting in one-year reproductive cycles. However, parts of SE Asian tropical forests have an aseasonal climate with irregular fluctuations. This database comprises phenology records collected from 1993 to 2011 at the community level in an aseasonal lowland dipterocarp forest of the Lambir Hills National Park in Borneo. Observations were made every two weeks at three sites: The Canopy Biology Plot (CBP) with tree towers and walkways, the Operation Raleigh Tower (ORT) area with a tree tower for tourist attraction, and the Crane Plot located between the CBP and ORT, where plants were monitored from terraces on a canopy crane installed in 2000. The dataset includes in total 172,521 records of 450, 118, and 51 plants in CBP, Crane Plot, and ORT, respectively, representing 303 species. The number of individuals per species ranges from 1 to 21, and 64.9% are represented by only one. The plants in the censuses were mostly trees but also included lianas and epiphytes. The data have been used to study the causes and consequences of synchronized flowering and fruiting at the community level, a phenomenon unique to the region. Previous studies have shown that this synchronization is synergistically driven by cool air temperature and drought. Irregular flowering and fruiting have significant impacts on flower visitors, frugivores, forest material cycling, and plant regeneration. The dataset can also be used for comparing the phenology of the same species or group among forests and regions and exploring its association with climates. One major concern regarding tropical forests in the area is the effects of climate change on this community-wide masting regime, which could disrupt forest regeneration and ecosystem processes. The dataset could be an important source of information for conservation efforts aimed at protecting these amazingly diverse forest ecosystems. This dataset can be freely used for non-commercial purposes. Users of these data should cite this data paper in any publications resulting from its use and acknowledge the Forest Department Sarawak and Sarawak Forestry Corporation.
{"title":"18-year plant reproductive phenology dataset from Lambir, Borneo, including four large general flowering events","authors":"Shoko Sakai, Teruyoshi Nagamitsu, Rhett D. Harrison, Tomoaki Ichie, Masahiro Nomura, Takakazu Yumoto, Hidetoshi Nagamasu, Runi anak Sylvester Pungga, Takao Itioka, Tohru Nakashizuka","doi":"10.1002/ecy.70053","DOIUrl":"https://doi.org/10.1002/ecy.70053","url":null,"abstract":"<p>Flowering and fruiting phenology can have large impacts on a plant's reproductive success. In many plant species, these phenological events are controlled by seasonal climatic cues, resulting in one-year reproductive cycles. However, parts of SE Asian tropical forests have an aseasonal climate with irregular fluctuations. This database comprises phenology records collected from 1993 to 2011 at the community level in an aseasonal lowland dipterocarp forest of the Lambir Hills National Park in Borneo. Observations were made every two weeks at three sites: The Canopy Biology Plot (CBP) with tree towers and walkways, the Operation Raleigh Tower (ORT) area with a tree tower for tourist attraction, and the Crane Plot located between the CBP and ORT, where plants were monitored from terraces on a canopy crane installed in 2000. The dataset includes in total 172,521 records of 450, 118, and 51 plants in CBP, Crane Plot, and ORT, respectively, representing 303 species. The number of individuals per species ranges from 1 to 21, and 64.9% are represented by only one. The plants in the censuses were mostly trees but also included lianas and epiphytes. The data have been used to study the causes and consequences of synchronized flowering and fruiting at the community level, a phenomenon unique to the region. Previous studies have shown that this synchronization is synergistically driven by cool air temperature and drought. Irregular flowering and fruiting have significant impacts on flower visitors, frugivores, forest material cycling, and plant regeneration. The dataset can also be used for comparing the phenology of the same species or group among forests and regions and exploring its association with climates. One major concern regarding tropical forests in the area is the effects of climate change on this community-wide masting regime, which could disrupt forest regeneration and ecosystem processes. The dataset could be an important source of information for conservation efforts aimed at protecting these amazingly diverse forest ecosystems. This dataset can be freely used for non-commercial purposes. Users of these data should cite this data paper in any publications resulting from its use and acknowledge the Forest Department Sarawak and Sarawak Forestry Corporation.</p>","PeriodicalId":11484,"journal":{"name":"Ecology","volume":"106 3","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ecy.70053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-10DOI: 10.1016/j.landurbplan.2025.105334
Ainara San-Juan-Escudero , Sendoa Ballesteros-Peña , Irrintzi Fernández-Aedo , Silvia Caballero Sánchez , Julia Fernandez-Alonso , Pedro Gullón , Manuel Franco , Leyre Gravina
Urban design significantly influences the physical activity (PA) behaviors of residents, impacting public health and well-being. This study examines how the built environment, social structures, economic conditions, and political context shape PA behaviors in three socioeconomically diverse neighborhoods in Bilbao, Spain. Using the Photovoice method, forty-one participants documented and discussed urban design features that affect their PA, fostering deep community engagement. A thematic analysis of 117 photographs identified four overarching factors influencing PA across all socioeconomic groups: 1) availability and quality of urban spaces for PA; 2) walkability and pedestrian infrastructure; 3) perceived safety and security; and 4) management of community assets. These factors were shaped by public space accessibility, topography, traffic-pedestrian interactions, and the extent of community involvement in urban planning. The study highlights the importance of inclusive, participatory approaches in urban planning to address health disparities and promote active, sustainable communities. Participants suggested specific interventions such as improving pedestrian infrastructure, enhancing safety measures, and increasing community-led management of shared assets to encourage active living. By emphasizing the role of social policies and community engagement, these findings provide a foundation for policymakers to develop strategies that promote equitable access to active living environments for all residents. While the study's insights are context-specific to Bilbao, they offer valuable lessons for similar urban settings, highlighting the potential of community-based approaches in fostering healthier and more inclusive cities.
{"title":"Exploring urban design’s impact on physical activity: A participatory photovoice study across socioeconomically diverse neighborhoods","authors":"Ainara San-Juan-Escudero , Sendoa Ballesteros-Peña , Irrintzi Fernández-Aedo , Silvia Caballero Sánchez , Julia Fernandez-Alonso , Pedro Gullón , Manuel Franco , Leyre Gravina","doi":"10.1016/j.landurbplan.2025.105334","DOIUrl":"10.1016/j.landurbplan.2025.105334","url":null,"abstract":"<div><div>Urban design significantly influences the physical activity (PA) behaviors of residents, impacting public health and well-being. This study examines how the built environment, social structures, economic conditions, and political context shape PA behaviors in three socioeconomically diverse neighborhoods in Bilbao, Spain. Using the Photovoice method, forty-one participants documented and discussed urban design features that affect their PA, fostering deep community engagement. A thematic analysis of 117 photographs identified four overarching factors influencing PA across all socioeconomic groups: 1) availability and quality of urban spaces for PA; 2) walkability and pedestrian infrastructure; 3) perceived safety and security; and 4) management of community assets. These factors were shaped by public space accessibility, topography, traffic-pedestrian interactions, and the extent of community involvement in urban planning. The study highlights the importance of inclusive, participatory approaches in urban planning to address health disparities and promote active, sustainable communities. Participants suggested specific interventions such as improving pedestrian infrastructure, enhancing safety measures, and increasing community-led management of shared assets to encourage active living. By emphasizing the role of social policies and community engagement, these findings provide a foundation for policymakers to develop strategies that promote equitable access to active living environments for all residents. While the study's insights are context-specific to Bilbao, they offer valuable lessons for similar urban settings, highlighting the potential of community-based approaches in fostering healthier and more inclusive cities.</div></div>","PeriodicalId":54744,"journal":{"name":"Landscape and Urban Planning","volume":"259 ","pages":"Article 105334"},"PeriodicalIF":7.9,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577984","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}
Leandro Augusto de Souza Junior, Rosângela Paula Teixeira Lessa
Sharks are important species that occupy different niches and trophic levels due to their biological and behavioural variability. It makes them a key element for conservation measures in marine environments. Among several stressors, climate changes put pressure on species in different ways (direct and indirect) and intensities. Understanding how changes may affect shark species is essential to evaluate measures that reduce the impact on shark populations and help them to adapt to a future climatic scenario. The aim was to identify the levels of vulnerability for Northern and Northeastern Brazil sharks to climate change based on a semiquantitative method of ecological risk assessment. Temperature and UV light were, respectively, the most concerning direct and indirect effects for sharks. In general, most of the assessed species have moderate chances of surviving the pressure caused by climate change. Carcharhinus porosus, Mustelus higmani and Isogomphodon oxyrhyncus were the most vulnerable assessed species. Coastal and estuarine sharks had high rates of exposure and high vulnerability indexes to climate change. Coastal and inshore species generally has high habitat specificity and latitudinal limitation, which worsens its ability to adapt to the new climate scenario. Both parameters may be a crucial factor in preserving coastal shark populations. Continental shelf habitats are commonly affected by other human stressors, such as fishing, waste contamination and destruction of tidal vegetation. In this way, region-specific conservation measures can reduce bycatch and increase reproductive efficiency, increasing the likelihood of coastal sharks surviving climate change. There is still little knowledge about the synergistic effect between human pressure and climate change. However, it is necessary to take measures to preserve the coastal and estuarine environments, so that the biota of these areas show favourable conditions for survival.
{"title":"Vulnerability of Brazilian Sharks to Climate Change: An Integrated Risk Assessment","authors":"Leandro Augusto de Souza Junior, Rosângela Paula Teixeira Lessa","doi":"10.1002/aqc.70064","DOIUrl":"https://doi.org/10.1002/aqc.70064","url":null,"abstract":"<div>\u0000 \u0000 <p>Sharks are important species that occupy different niches and trophic levels due to their biological and behavioural variability. It makes them a key element for conservation measures in marine environments. Among several stressors, climate changes put pressure on species in different ways (direct and indirect) and intensities. Understanding how changes may affect shark species is essential to evaluate measures that reduce the impact on shark populations and help them to adapt to a future climatic scenario. The aim was to identify the levels of vulnerability for Northern and Northeastern Brazil sharks to climate change based on a semiquantitative method of ecological risk assessment. Temperature and UV light were, respectively, the most concerning direct and indirect effects for sharks. In general, most of the assessed species have moderate chances of surviving the pressure caused by climate change. <i>Carcharhinus porosus</i>, <i>Mustelus higmani</i> and <i>Isogomphodon oxyrhyncus</i> were the most vulnerable assessed species. Coastal and estuarine sharks had high rates of exposure and high vulnerability indexes to climate change. Coastal and inshore species generally has high habitat specificity and latitudinal limitation, which worsens its ability to adapt to the new climate scenario. Both parameters may be a crucial factor in preserving coastal shark populations. Continental shelf habitats are commonly affected by other human stressors, such as fishing, waste contamination and destruction of tidal vegetation. In this way, region-specific conservation measures can reduce bycatch and increase reproductive efficiency, increasing the likelihood of coastal sharks surviving climate change. There is still little knowledge about the synergistic effect between human pressure and climate change. However, it is necessary to take measures to preserve the coastal and estuarine environments, so that the biota of these areas show favourable conditions for survival.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143581609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-03-10DOI: 10.1016/j.jclepro.2025.145275
Wen Luge, Zhang Tianjiao, Shen Tiyan
Utilizing statistical data from the period 2012 to 2021, this study assesses the land use structure efficiency (ULUSE) across 282 prefecture-level cities in China. Moreover, a spatial Durbin model (SDM) is employed to analyze the determinants influencing this efficiency. The findings reveal an improvement in the structural efficiency of land use in these cities over the research period, accompanied by distinct spatial characteristics and regional variances. Specifically, the areas displaying higher efficiency predominantly include the Yangtze River Delta (YRD) region, the Pearl River Delta (PRD) region, as well as Beijing, Tianjin, northern Hunan, southern Hubei, eastern Shandong, and the border region between Anhui and Henan. Spatial correlation analyses show that ULUSE is consistently highest in the eastern region and fastest growing in the central region, while the northeastern region as well as the western region show a slow growth or even a declining trend in ULUSE. The regression results show that ULUSE has a significant positive spatial spillover effect across China, which is more pronounced in the eastern and western regions than in the central and northeastern regions. Regarding the impact of various factors, urban economic growth directly enhances ULUSE but paradoxically provides a negative spatial spillover effect. Urbanization rate and government fiscal pressure have direct negative and positive spatial spillover effects on ULUSE, respectively. Additionally, urban economic growth potential has a straightforward positive impact, whereas industrial structure upgrading will, to a certain extent, reduce the level of local ULUSE. Furthermore, rapid urban expansion greatly contributes to the improvement of ULUSE in neighboring areas. Given the evident disparities in the impacts of various factors on ULUSE across different regions, it is crucial to conduct a comprehensive evaluation of regional needs and conditions. This evaluation should be followed by the implementation of region-specific strategies aimed at enhancing the efficiency of urban land use structures. Consequently, this approach will enable the optimization of land use effectiveness in a comprehensive and sustainable manner.
{"title":"Spatial-Temporal Evolution and Influencing Factors of Urban Land Use Structure Efficiency: Evidence from 282 cities in China","authors":"Wen Luge, Zhang Tianjiao, Shen Tiyan","doi":"10.1016/j.jclepro.2025.145275","DOIUrl":"https://doi.org/10.1016/j.jclepro.2025.145275","url":null,"abstract":"Utilizing statistical data from the period 2012 to 2021, this study assesses the land use structure efficiency (ULUSE) across 282 prefecture-level cities in China. Moreover, a spatial Durbin model (SDM) is employed to analyze the determinants influencing this efficiency. The findings reveal an improvement in the structural efficiency of land use in these cities over the research period, accompanied by distinct spatial characteristics and regional variances. Specifically, the areas displaying higher efficiency predominantly include the Yangtze River Delta (YRD) region, the Pearl River Delta (PRD) region, as well as Beijing, Tianjin, northern Hunan, southern Hubei, eastern Shandong, and the border region between Anhui and Henan. Spatial correlation analyses show that ULUSE is consistently highest in the eastern region and fastest growing in the central region, while the northeastern region as well as the western region show a slow growth or even a declining trend in ULUSE. The regression results show that ULUSE has a significant positive spatial spillover effect across China, which is more pronounced in the eastern and western regions than in the central and northeastern regions. Regarding the impact of various factors, urban economic growth directly enhances ULUSE but paradoxically provides a negative spatial spillover effect. Urbanization rate and government fiscal pressure have direct negative and positive spatial spillover effects on ULUSE, respectively. Additionally, urban economic growth potential has a straightforward positive impact, whereas industrial structure upgrading will, to a certain extent, reduce the level of local ULUSE. Furthermore, rapid urban expansion greatly contributes to the improvement of ULUSE in neighboring areas. Given the evident disparities in the impacts of various factors on ULUSE across different regions, it is crucial to conduct a comprehensive evaluation of regional needs and conditions. This evaluation should be followed by the implementation of region-specific strategies aimed at enhancing the efficiency of urban land use structures. Consequently, this approach will enable the optimization of land use effectiveness in a comprehensive and sustainable manner.","PeriodicalId":349,"journal":{"name":"Journal of Cleaner Production","volume":"132 1","pages":""},"PeriodicalIF":11.1,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143583068","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}
Despite recent advances in the understanding of the impacts of microplastics (MPs) on the soil microbiome under short-term exposure, little information is known regarding the long-term ecological effects of MPs in soil, especially biodegradable MPs (BMPs). Here, we systematically compared the effects of four prevalent microplastics, including two conventional MPs (CMPs) and two BMPs, on the soil microbiome over short- and long-term exposure durations. The soil microbial community were not significantly affected by the MP addition under short-term exposure; however, the soil microbial composition was obviously impacted by MP exposure under long-term exposure, some MP-adapted microbes (e.g., the phyla Protobacteria and Actinobacteria) were enriched but the phyla Acidobacteriota declined. These results indicated that the effects of the MP exposure on the soil microbiome were time dependent. PERMANOVA analysis demonstrated that the exposure time played a more important role in the variation in soil microbiome than the polymer type. The soil microbes which were reshaped by MPs were specialized in genetic potential of lipid metabolism and xenobiotics degradation and metabolism and weakened in microbial genetic information process. The carbon metabolic capacity and nitrogen transformation of soil microbes were disturbed by MPs under long-term exposure. Compared with CMPs, many more MPs derivatives, such as dissolved organic matter and low molecular-weight oligomers, were released from BMPs during the long-term degradation process in soil; thus, BMPs had a stronger effect on the soil microbiome than CMPs under long-term exposure. This study underscores the potential risk of the replacement of conventional plastics with biodegradable plastics.
{"title":"Deciphering the effects of long-term exposure to conventional and biodegradable microplastics on the soil microbiome","authors":"Wenbo Deng, Xiaoqi Zhang, Wenjuan Liu, Xingfei Wang, Zihan Wang, Jinxian Liu, Wenjuan Zhai, Jian Wang, Zhibo Zhao","doi":"10.1016/j.jhazmat.2025.137890","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137890","url":null,"abstract":"Despite recent advances in the understanding of the impacts of microplastics (MPs) on the soil microbiome under short-term exposure, little information is known regarding the long-term ecological effects of MPs in soil, especially biodegradable MPs (BMPs). Here, we systematically compared the effects of four prevalent microplastics, including two conventional MPs (CMPs) and two BMPs, on the soil microbiome over short- and long-term exposure durations. The soil microbial community were not significantly affected by the MP addition under short-term exposure; however, the soil microbial composition was obviously impacted by MP exposure under long-term exposure, some MP-adapted microbes (e.g., the phyla Protobacteria and Actinobacteria) were enriched but the phyla Acidobacteriota declined. These results indicated that the effects of the MP exposure on the soil microbiome were time dependent. PERMANOVA analysis demonstrated that the exposure time played a more important role in the variation in soil microbiome than the polymer type. The soil microbes which were reshaped by MPs were specialized in genetic potential of lipid metabolism and xenobiotics degradation and metabolism and weakened in microbial genetic information process. The carbon metabolic capacity and nitrogen transformation of soil microbes were disturbed by MPs under long-term exposure. Compared with CMPs, many more MPs derivatives, such as dissolved organic matter and low molecular-weight oligomers, were released from BMPs during the long-term degradation process in soil; thus, BMPs had a stronger effect on the soil microbiome than CMPs under long-term exposure. This study underscores the potential risk of the replacement of conventional plastics with biodegradable plastics.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"149 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143582504","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}
Pub Date : 2025-03-10DOI: 10.1016/j.jhazmat.2025.137889
Lili Rong, Yu Wang, Peter Meidl, Mujtaba Baqar, Andi Li, Lei Wang, Hongwen Sun
Biodegradable microplastics (MPs) are proposed as sustainable alternatives to conventional MPs, yet their distinct effects on soil microbial communities and ecological functions remain insufficiently understood. This study compares the impacts of biodegradable polylactic acid (PLA) and conventional polyvinyl chloride (PVC) MPs on soil microbial assemblages and nitrogen cycling. Fluorescein diacetate hydrolase (FDAse) activity was temporarily stimulated by 2% (w/w) PLA and PVC MPs, while 7% (w/w) PVC MPs initially inhibited FDAse activity before promoting it. PLA MPs (2% and 7%, w/w) dramatically reduced bacterial diversity and altered community structure, enriching genera such as Nocardioides, Arthrobacter, Agromyces, Amycolatopsis, Saccharothrix, and Ramlibacter, known for degrading complex compounds. Conversely, PVC MPs (2% and 7%, w/w) showed minimal influence on bacterial diversity, with only temporary structural shifts at high concentrations (7% w/w). Network analysis revealed greater microbial complexity with PLA MPs, where MPs-degrading taxa emerged as keystone species. PLA MPs at both concentrations notably increased the abundance of nitrogenase iron protein subunit H gene (nifH) and nitrogen-fixing bacteria, such as Bradyrhizobium, while also sustaining ammonia monooxygenase subunit A gene (AOB amoA) effects up to day 90. At higher doses (7% w/w), PLA MPs enriched copper-containing nitrite reductase gene (nirK) and cytochrome cd1 nitrite reductase gene (nirS) abundance, boosting denitrifiers like Cupriavidus, Pseudarthrobacter, and Ensifer. In contrast, PVC MPs showed short-term effects on nitrogen cycling function. These findings have important implications for promoting sustainable agriculture and managing the environmental risks posed by MPs in soil ecosystems.
{"title":"Insights into soil microbial assemblages and nitrogen cycling function responses to conventional and biodegradable microplastics","authors":"Lili Rong, Yu Wang, Peter Meidl, Mujtaba Baqar, Andi Li, Lei Wang, Hongwen Sun","doi":"10.1016/j.jhazmat.2025.137889","DOIUrl":"https://doi.org/10.1016/j.jhazmat.2025.137889","url":null,"abstract":"Biodegradable microplastics (MPs) are proposed as sustainable alternatives to conventional MPs, yet their distinct effects on soil microbial communities and ecological functions remain insufficiently understood. This study compares the impacts of biodegradable polylactic acid (PLA) and conventional polyvinyl chloride (PVC) MPs on soil microbial assemblages and nitrogen cycling. Fluorescein diacetate hydrolase (FDAse) activity was temporarily stimulated by 2% (w/w) PLA and PVC MPs, while 7% (w/w) PVC MPs initially inhibited FDAse activity before promoting it. PLA MPs (2% and 7%, w/w) dramatically reduced bacterial diversity and altered community structure, enriching genera such as <em>Nocardioides</em>, <em>Arthrobacter</em>, <em>Agromyces</em>, <em>Amycolatopsis</em>, <em>Saccharothrix</em>, and <em>Ramlibacter</em>, known for degrading complex compounds. Conversely, PVC MPs (2% and 7%, w/w) showed minimal influence on bacterial diversity, with only temporary structural shifts at high concentrations (7% w/w). Network analysis revealed greater microbial complexity with PLA MPs, where MPs-degrading taxa emerged as keystone species. PLA MPs at both concentrations notably increased the abundance of nitrogenase iron protein subunit H gene (<em>nifH</em>) and nitrogen-fixing bacteria, such as <em>Bradyrhizobium</em>, while also sustaining ammonia monooxygenase subunit A gene (<em>AOB amoA</em>) effects up to day 90. At higher doses (7% w/w), PLA MPs enriched copper-containing nitrite reductase gene (<em>nirK</em>) and cytochrome cd1 nitrite reductase gene (<em>nirS</em>) abundance, boosting denitrifiers like <em>Cupriavidus</em>, <em>Pseudarthrobacter</em>, and <em>Ensifer</em>. In contrast, PVC MPs showed short-term effects on nitrogen cycling function. These findings have important implications for promoting sustainable agriculture and managing the environmental risks posed by MPs in soil ecosystems.","PeriodicalId":361,"journal":{"name":"Journal of Hazardous Materials","volume":"9 13 1","pages":""},"PeriodicalIF":13.6,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143582509","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}
Pub Date : 2025-03-10DOI: 10.1016/j.marpolbul.2025.117797
Ifenna Ilechukwu , Mackenzie Stoeltje , Edith Conn , James Davis Reimer
Marine litter pollution has become a global concern due to its adverse effects on biodiversity and general negative influence on marine ecosystem services. Marine litter pollution of remote islands is currently understudied due to accessibility challenges. This study evaluated marine litter abundance and distribution on 15 beaches around semi-remote islands of Ishigaki and Taketomi, Japan. A total of 2161 items weighing 206.01 kg with average density of 0.15 items/m2 were collected from nine beaches around Ishigaki Island while 1098 items weighing 73.62 kg with average density of 0.10 items/m2 were collected from six beaches around Taketomi Island. Shoreline activities, reflecting the variety of human activities on the islands, were the major litter sources at 68.26 % and 90.44 % for Ishigaki and Taketomi islands, respectively. Litter items were dominated by plastics at >80 % for both islands while single-use plastics (SUPs), dominated by PET bottles and caps, constituted 39 % of total litter items on both islands. Clean coast, plastic abundance and hazardous indices employed to assess the beach quality were all within low to moderate levels. This study draws attention to marine litter pollution of remote islands, particularly by plastic items, and recommends effective management of SUPs as the necessary first step towards marine litter reduction.
{"title":"Marine litter on remote islands: Case study of beaches in Ishigaki and Taketomi Islands, Japan","authors":"Ifenna Ilechukwu , Mackenzie Stoeltje , Edith Conn , James Davis Reimer","doi":"10.1016/j.marpolbul.2025.117797","DOIUrl":"10.1016/j.marpolbul.2025.117797","url":null,"abstract":"<div><div>Marine litter pollution has become a global concern due to its adverse effects on biodiversity and general negative influence on marine ecosystem services. Marine litter pollution of remote islands is currently understudied due to accessibility challenges. This study evaluated marine litter abundance and distribution on 15 beaches around semi-remote islands of Ishigaki and Taketomi, Japan. A total of 2161 items weighing 206.01 kg with average density of 0.15 items/m<sup>2</sup> were collected from nine beaches around Ishigaki Island while 1098 items weighing 73.62 kg with average density of 0.10 items/m<sup>2</sup> were collected from six beaches around Taketomi Island. Shoreline activities, reflecting the variety of human activities on the islands, were the major litter sources at 68.26 % and 90.44 % for Ishigaki and Taketomi islands, respectively. Litter items were dominated by plastics at >80 % for both islands while single-use plastics (SUPs), dominated by PET bottles and caps, constituted 39 % of total litter items on both islands. Clean coast, plastic abundance and hazardous indices employed to assess the beach quality were all within low to moderate levels. This study draws attention to marine litter pollution of remote islands, particularly by plastic items, and recommends effective management of SUPs as the necessary first step towards marine litter reduction.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117797"},"PeriodicalIF":5.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-03-10DOI: 10.1016/j.marpolbul.2025.117792
Alaa M. Younis , Eman M. Elkady , Naglaa F. Soliman
This paper adds a new perspective to Ras Mohamed Protectorate mangrove sediment quality studies in terms of bioavailability, mobility, human and eco-environmental risk of various potential toxic elements (PTEs). Fe > Mn > Pb > Cu > Cd was the order in which the PTE levels declined. Residual fraction controlled the geochemical speciation of all elements. The following was the order of the mean percentages of mobile elements in sediments: Mn > Fe > Pb > Cu > Cd. All sediment samples had low to moderate risk, according to synergistic indices (GCF, mRAC, PETI-A and PTEI-B). Mn was the primary ecological risk PTE contributor. According to the suggested individual indices, Mn is the most mobile and bioavailable element (0.4–1), whereas Cd, Cu, Fe, and Pb have moderate mobility and bioavailability (MI 0.1–0.4 and BI 0.1–0.4, respectively). The current PTE exposure in sediments did not constitute a significant health concern (THQ < 1 and LCR < 10−4).
{"title":"Fractionation, chemometric analysis, and sophisticated risk assessment indices to appraise sediment contamination of a tropical mangrove forests, the Red Sea","authors":"Alaa M. Younis , Eman M. Elkady , Naglaa F. Soliman","doi":"10.1016/j.marpolbul.2025.117792","DOIUrl":"10.1016/j.marpolbul.2025.117792","url":null,"abstract":"<div><div>This paper adds a new perspective to Ras Mohamed Protectorate mangrove sediment quality studies in terms of bioavailability, mobility, human and eco-environmental risk of various potential toxic elements (PTEs). Fe > Mn > Pb > Cu > Cd was the order in which the PTE levels declined. Residual fraction controlled the geochemical speciation of all elements. The following was the order of the mean percentages of mobile elements in sediments: Mn > Fe > Pb > Cu > Cd. All sediment samples had low to moderate risk, according to synergistic indices (GCF, mRAC, PETI-A and PTEI-B). Mn was the primary ecological risk PTE contributor. According to the suggested individual indices, Mn is the most mobile and bioavailable element (0.4–1), whereas Cd, Cu, Fe, and Pb have moderate mobility and bioavailability (MI 0.1–0.4 and BI 0.1–0.4, respectively). The current PTE exposure in sediments did not constitute a significant health concern (THQ < 1 and LCR < 10<sup>−4</sup>).</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"214 ","pages":"Article 117792"},"PeriodicalIF":5.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}
Pub Date : 2025-03-10DOI: 10.1016/j.jenvman.2025.124815
Peng Liu , Ying Chen , Shengyu Su , Yanling Li , Xueqin Li , Tingzhou Lei
Converting biomass waste into hydrogen energy through gasification is a crucial pathway for producing “green hydrogen”. In a fixed bed reactor, a representative biomass waste, rice straw (RS), was pyrolyzed at N2, H2O, CO2, and O2 atmospheres to generate hydrogen. Solid C-13 Nuclear Magnetic Resonance Spectroscopy (13C-NMR) and Fourier Transform infrared spectroscopy (FTIR) were employed to elucidate the carbon structure and functional groups of the samples. The hydrogen ratio in pyrolysis gas is monitored by gas chromatography (GC). The results show that hydrogen release from RS increases after 400 °C because of thermal polymerization occurrence shown in thermogravimetric(TG) analysis. Pyrolysis of RS at N2, H2O, CO2 and O2 atmosphere for H2 formation with the order is H2O > CO2>N2>O2. H2O is acted as catalyst, impregnant, and reactant for char forming reaction and gas rearrangement to facilitate H2 production which increases to 205.84 mL/g at 900 °C. The phenolic groups increase for forming the active intermediates to combines with H radical from H2O to form H2. Meanwhile, the H2O facilitates the rearrangement, condensation, and polymerization reaction of aromatic rings to form H2. The bridged aromatic carbon increases. H2 is also formed by gas rearrangement reaction from CH4 to H2 during steam gasification. These results are the guide for equipment development and industrialization for biomass waste to hydrogen energy.
{"title":"Insight into carbon structural variation from steam gasification of rice straw on enhancing hydrogen generation","authors":"Peng Liu , Ying Chen , Shengyu Su , Yanling Li , Xueqin Li , Tingzhou Lei","doi":"10.1016/j.jenvman.2025.124815","DOIUrl":"10.1016/j.jenvman.2025.124815","url":null,"abstract":"<div><div>Converting biomass waste into hydrogen energy through gasification is a crucial pathway for producing “green hydrogen”. In a fixed bed reactor, a representative biomass waste, rice straw (RS), was pyrolyzed at N<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub>, and O<sub>2</sub> atmospheres to generate hydrogen. Solid C-13 Nuclear Magnetic Resonance Spectroscopy (<sup>13</sup>C-NMR) and Fourier Transform infrared spectroscopy (FTIR) were employed to elucidate the carbon structure and functional groups of the samples. The hydrogen ratio in pyrolysis gas is monitored by gas chromatography (GC). The results show that hydrogen release from RS increases after 400 °C because of thermal polymerization occurrence shown in thermogravimetric(TG) analysis. Pyrolysis of RS at N<sub>2</sub>, H<sub>2</sub>O, CO<sub>2</sub> and O<sub>2</sub> atmosphere for H<sub>2</sub> formation with the order is H<sub>2</sub>O > CO<sub>2</sub>>N<sub>2</sub>>O<sub>2</sub>. H<sub>2</sub>O is acted as catalyst, impregnant, and reactant for char forming reaction and gas rearrangement to facilitate H<sub>2</sub> production which increases to 205.84 mL/g at 900 °C. The phenolic groups increase for forming the active intermediates to combines with H radical from H<sub>2</sub>O to form H<sub>2</sub>. Meanwhile, the H<sub>2</sub>O facilitates the rearrangement, condensation, and polymerization reaction of aromatic rings to form H<sub>2</sub>. The bridged aromatic carbon increases. H<sub>2</sub> is also formed by gas rearrangement reaction from CH<sub>4</sub> to H<sub>2</sub> during steam gasification. These results are the guide for equipment development and industrialization for biomass waste to hydrogen energy.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"379 ","pages":"Article 124815"},"PeriodicalIF":8.0,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580773","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号