Pub Date : 2026-02-09DOI: 10.1080/10256016.2026.2617939
Abdul-Wali Ajlouni, Kholoud Kharisat, Mahmoud Kulab, Ahmed Qwasmeh, Naima Amrani, Zinab Matar, Hana Almarri, Khaled Ali
This study aims to determine the specific activity of natural uranium isotopes, including uranium-238 (238U), uranium-234 (234U), and uranium-235 (235U), in soil and vegetable samples - specifically tomato, potato, onion, carrot, and radish - collected from the Tafila district, Jordan, and to assess the soil-to-plant transfer factors using alpha spectrometry with a passivated implanted planar silicon (PIPS) detector. A total of eight soil samples and eight corresponding vegetable samples were obtained from eight distinct locations. The results revealed considerable spatial variability in uranium activity concentrations, reflecting the influence of geological formations and environmental conditions. The average activity concentrations were 251.6 ± 14.2 Bq/kg for 238U, 10.5 ± 1.9 Bq/kg for 235U, and 248.8 ± 13.9 Bq/kg for 234U in soil samples, while vegetable samples showed lower concentrations of 3.2 ± 0.16, 0.21 ± 0.05, and 3.1 ± 0.17 Bq/kg for 238U, 235U, and 234U, respectively. The calculated transfer factors ranged from 4.4 ± 0.4 × 10-3 to 29.1 ± 1.8 × 10-3 for 238U, 6.4 ± 1.4 × 10-3 to 33.0 ± 15.7 × 10-3 for 235U, and 4.3 ± 0.4 × 10-3 to 28.7 ± 1.9 × 10-3 for 234U, which reflects notable differences in uranium uptake efficiency among the studied plant species. A strong correlation (R2 = 0.99) was observed between 238U and 234U in both soil and vegetable samples, suggesting isotopic equilibrium through natural decay. These findings provide essential baseline data for future studies on uranium mobility, bioavailability, and potential radiological risks in agricultural systems within the Tafila District.
{"title":"Alpha spectrometric analysis and environmental assessment of uranium concentrations in soil and vegetation from the Tafila District, Jordan.","authors":"Abdul-Wali Ajlouni, Kholoud Kharisat, Mahmoud Kulab, Ahmed Qwasmeh, Naima Amrani, Zinab Matar, Hana Almarri, Khaled Ali","doi":"10.1080/10256016.2026.2617939","DOIUrl":"https://doi.org/10.1080/10256016.2026.2617939","url":null,"abstract":"<p><p>This study aims to determine the specific activity of natural uranium isotopes, including uranium-238 (<sup>238</sup>U), uranium-234 (<sup>234</sup>U), and uranium-235 (<sup>235</sup>U), in soil and vegetable samples - specifically tomato, potato, onion, carrot, and radish - collected from the Tafila district, Jordan, and to assess the soil-to-plant transfer factors using alpha spectrometry with a passivated implanted planar silicon (PIPS) detector. A total of eight soil samples and eight corresponding vegetable samples were obtained from eight distinct locations. The results revealed considerable spatial variability in uranium activity concentrations, reflecting the influence of geological formations and environmental conditions. The average activity concentrations were 251.6 ± 14.2 Bq/kg for <sup>238</sup>U, 10.5 ± 1.9 Bq/kg for <sup>235</sup>U, and 248.8 ± 13.9 Bq/kg for <sup>234</sup>U in soil samples, while vegetable samples showed lower concentrations of 3.2 ± 0.16, 0.21 ± 0.05, and 3.1 ± 0.17 Bq/kg for <sup>238</sup>U, <sup>235</sup>U, and <sup>234</sup>U, respectively. The calculated transfer factors ranged from 4.4 ± 0.4 × 10<sup>-3</sup> to 29.1 ± 1.8 × 10<sup>-3</sup> for <sup>238</sup>U, 6.4 ± 1.4 × 10<sup>-3</sup> to 33.0 ± 15.7 × 10<sup>-3</sup> for <sup>235</sup>U, and 4.3 ± 0.4 × 10<sup>-3</sup> to 28.7 ± 1.9 × 10<sup>-3</sup> for <sup>234</sup>U, which reflects notable differences in uranium uptake efficiency among the studied plant species. A strong correlation (<i>R</i><sup>2</sup> = 0.99) was observed between <sup>238</sup>U and <sup>234</sup>U in both soil and vegetable samples, suggesting isotopic equilibrium through natural decay. These findings provide essential baseline data for future studies on uranium mobility, bioavailability, and potential radiological risks in agricultural systems within the Tafila District.</p>","PeriodicalId":14597,"journal":{"name":"Isotopes in Environmental and Health Studies","volume":" ","pages":"1-18"},"PeriodicalIF":1.4,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146142368","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}
Understanding the feedback mechanisms between vegetation and soil moisture (SM) is crucial for elucidating the coupled carbon-water processes of terrestrial ecosystems under climate change. However, existing studies are limited by coarse spatial resolution and an over-reliance on linear methods, thereby hindering the exploration of their nonlinear interactions for highly heterogeneous areas. In this study, we employed high-resolution (1 km) satellite-based datasets and a Random Forest-based nonlinear Granger causality analysis to investigate the feedback relationship between gross primary productivity (GPP) and SM at different depths (0-100 cm) in Northeast China from 2000 to 2022, along with the driving factors influencing their interactions. The results show that both GPP and SM showed a significant increasing trend during the study period, with a dominant pattern of synergistic growth (GPP + SM +), accounting for more than 94%. This proportion of synergistic increase slightly decreased with increasing soil depth. The bidirectional causal relationships were observed in 41.24% to 71.87% of the study area, with the proportion declining as soil depth increased. Among these, the influence of SM on GPP was generally stronger than the feedback from GPP to SM. The mutual feedback exhibited a lagged response of 2-3 months, showing a nonlinear pattern that first decreased and then increased with soil depth. Further analysis revealed that this feedback relationship was jointly regulated by solar radiation, precipitation, and temperature, and varied significantly across different vegetation and soil types.This study reveals the complex interaction mechanisms between vegetation and SM, providing a basis for regional agricultural optimization and ecological restoration.
{"title":"Nonlinear characteristics and driving factors of vegetation-soil moisture feedback at fine scale in Northeast China.","authors":"Yang Gao, Fang Huang, Ping Wang, Jiameng Gao, Pei Wu, Yue Zhang","doi":"10.1007/s10661-026-15053-2","DOIUrl":"https://doi.org/10.1007/s10661-026-15053-2","url":null,"abstract":"<p><p>Understanding the feedback mechanisms between vegetation and soil moisture (SM) is crucial for elucidating the coupled carbon-water processes of terrestrial ecosystems under climate change. However, existing studies are limited by coarse spatial resolution and an over-reliance on linear methods, thereby hindering the exploration of their nonlinear interactions for highly heterogeneous areas. In this study, we employed high-resolution (1 km) satellite-based datasets and a Random Forest-based nonlinear Granger causality analysis to investigate the feedback relationship between gross primary productivity (GPP) and SM at different depths (0-100 cm) in Northeast China from 2000 to 2022, along with the driving factors influencing their interactions. The results show that both GPP and SM showed a significant increasing trend during the study period, with a dominant pattern of synergistic growth (GPP + SM +), accounting for more than 94%. This proportion of synergistic increase slightly decreased with increasing soil depth. The bidirectional causal relationships were observed in 41.24% to 71.87% of the study area, with the proportion declining as soil depth increased. Among these, the influence of SM on GPP was generally stronger than the feedback from GPP to SM. The mutual feedback exhibited a lagged response of 2-3 months, showing a nonlinear pattern that first decreased and then increased with soil depth. Further analysis revealed that this feedback relationship was jointly regulated by solar radiation, precipitation, and temperature, and varied significantly across different vegetation and soil types.This study reveals the complex interaction mechanisms between vegetation and SM, providing a basis for regional agricultural optimization and ecological restoration.</p>","PeriodicalId":544,"journal":{"name":"Environmental Monitoring and Assessment","volume":"198 2","pages":"215"},"PeriodicalIF":3.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146148601","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}
Pub Date : 2026-02-09DOI: 10.1016/j.scitotenv.2026.181531
Jieting Wu, Tian Gao, Lei Zhao, Sidi Lv, Jin Lv, Fang Ma
{"title":"Corrigendum to \"Application of molecular dynamics simulation for exploring the roles of plant biomolecules in promoting environmental health\" [Sci. Total Environ. 869 (2023),161871].","authors":"Jieting Wu, Tian Gao, Lei Zhao, Sidi Lv, Jin Lv, Fang Ma","doi":"10.1016/j.scitotenv.2026.181531","DOIUrl":"https://doi.org/10.1016/j.scitotenv.2026.181531","url":null,"abstract":"","PeriodicalId":422,"journal":{"name":"Science of the Total Environment","volume":" ","pages":"181531"},"PeriodicalIF":8.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146148632","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 : 2026-02-09DOI: 10.1016/j.psep.2026.108584
Xiang Li, Jintao Gao, Xi Lan, Anjun Shi, Zhancheng Guo
Crude lead is a hazardous material containing large amounts of heavy metals. However, due to the outdated equipment of copper removal process, resulting in a large lead loss. In this study, a new method for efficient purification of crude lead to prevent lead loss based on Pb-Cu interface properties and phase separation under supergravity field was proposed. The effect of Cu content in crude lead on the temperature range for Cu phase precipitation was investigated, revealing that as the Cu content increased from 0.5 to 4wt.%, the precipitation temperature range of the Cu phase expanded from 400-330 ℃ to 800-330 ℃. Then, the highly efficient purification of crude lead was all accomplished under 330 ℃ by supergravity separation and the Cu contents were lowered to 0.0718wt.% in the Pb liquid and the Cu phase removal rate reached over 99.9%. In order to reduce the lead loss, the Pb-Cu interface properties and separation process model were investigated, which showed that increasing the temperature in supergravity field could reduce the height of Pb liquid on the surface of the Cu phase. Finally, the Pb-Cu separation behavior was researched, revealing a quantitative relationship between lead loss and Cu content in crude lead and separation temperature. Base on the above results, corresponding copper removal process routes were designed for crude lead with different Cu contents.
{"title":"Efficient purification of crude lead to prevent lead loss based on Pb-Cu interface properties and phase separation under supergravity field","authors":"Xiang Li, Jintao Gao, Xi Lan, Anjun Shi, Zhancheng Guo","doi":"10.1016/j.psep.2026.108584","DOIUrl":"https://doi.org/10.1016/j.psep.2026.108584","url":null,"abstract":"Crude lead is a hazardous material containing large amounts of heavy metals. However, due to the outdated equipment of copper removal process, resulting in a large lead loss. In this study, a new method for efficient purification of crude lead to prevent lead loss based on Pb-Cu interface properties and phase separation under supergravity field was proposed. The effect of Cu content in crude lead on the temperature range for Cu phase precipitation was investigated, revealing that as the Cu content increased from 0.5 to 4<ce:hsp sp=\"0.25\"></ce:hsp>wt.%, the precipitation temperature range of the Cu phase expanded from 400-330 ℃ to 800-330 ℃. Then, the highly efficient purification of crude lead was all accomplished under 330 ℃ by supergravity separation and the Cu contents were lowered to 0.0718<ce:hsp sp=\"0.25\"></ce:hsp>wt.% in the Pb liquid and the Cu phase removal rate reached over 99.9%. In order to reduce the lead loss, the Pb-Cu interface properties and separation process model were investigated, which showed that increasing the temperature in supergravity field could reduce the height of Pb liquid on the surface of the Cu phase. Finally, the Pb-Cu separation behavior was researched, revealing a quantitative relationship between lead loss and Cu content in crude lead and separation temperature. Base on the above results, corresponding copper removal process routes were designed for crude lead with different Cu contents.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"46 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146223","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}
Pub Date : 2026-02-09DOI: 10.1016/j.psep.2026.108581
Yu Wang, Fei Wu, Hang Zhang, Zhenyu Ouyang, Yuhua Su, Hailiang Yin, Fanwei Meng, Qiyou Liu
The synergistic effect between microbial-induced corrosion (MIC) and under-deposit corrosion (UDC) presents a significant threat to the integrity of oil pipelines. This study investigates the corrosion behavior of X65 carbon steel under the influence of living microorganisms within pipeline deposits. The experiment was divided into three groups: unsterilized deposit group, sterilized deposit group, and control group. A combination of high-throughput sequencing, quantitative PCR, weight loss measurements, electrochemical tests, and surface characterization revealed that viable microorganisms drastically exacerbate UDC. Live microorganisms significantly enhanced the corrosion rate and maximum pitting depth by approximately 4.1 and 12.8 times, respectively, compared to the sterilized deposit group. Analysis of the microbial community revealed a successional shift, with sulfate-reducing bacteria (SRB), predominantly the genus Desulfovibrio, displacing nitrate-reducing bacteria (NRB) as the dominant population. The metabolic activity of SRB led to the formation of corrosive FeS and a porous, non-protective corrosion product film, which reduced film resistance (Rf) and accelerated metal dissolution. These findings indicate deposits in oil pipelines exacerbate localized corrosion by promoting the colonization and enrichment of corrosion-promoting microorganisms such as SRBs. Their metabolic products, combined with the resulting corrosion byproducts, further increase the overall burden of the deposits, creating a vicious cycle.
{"title":"Accelerated under-deposit corrosion of X65 steel driven by a vicious microbe-deposit cycle","authors":"Yu Wang, Fei Wu, Hang Zhang, Zhenyu Ouyang, Yuhua Su, Hailiang Yin, Fanwei Meng, Qiyou Liu","doi":"10.1016/j.psep.2026.108581","DOIUrl":"https://doi.org/10.1016/j.psep.2026.108581","url":null,"abstract":"The synergistic effect between microbial-induced corrosion (MIC) and under-deposit corrosion (UDC) presents a significant threat to the integrity of oil pipelines. This study investigates the corrosion behavior of X65 carbon steel under the influence of living microorganisms within pipeline deposits. The experiment was divided into three groups: unsterilized deposit group, sterilized deposit group, and control group. A combination of high-throughput sequencing, quantitative PCR, weight loss measurements, electrochemical tests, and surface characterization revealed that viable microorganisms drastically exacerbate UDC. Live microorganisms significantly enhanced the corrosion rate and maximum pitting depth by approximately 4.1 and 12.8 times, respectively, compared to the sterilized deposit group. Analysis of the microbial community revealed a successional shift, with sulfate-reducing bacteria (SRB), predominantly the genus <ce:italic>Desulfovibrio</ce:italic>, displacing nitrate-reducing bacteria (NRB) as the dominant population. The metabolic activity of SRB led to the formation of corrosive FeS and a porous, non-protective corrosion product film, which reduced film resistance (R<ce:inf loc=\"post\">f</ce:inf>) and accelerated metal dissolution. These findings indicate deposits in oil pipelines exacerbate localized corrosion by promoting the colonization and enrichment of corrosion-promoting microorganisms such as SRBs. Their metabolic products, combined with the resulting corrosion byproducts, further increase the overall burden of the deposits, creating a vicious cycle.","PeriodicalId":20743,"journal":{"name":"Process Safety and Environmental Protection","volume":"9 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146264","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}
Pub Date : 2026-02-09DOI: 10.1016/j.envpol.2026.127791
Tao Sun, Huifeng Wu
Micro/Nanoplastics (MNPs) and per- and polyfluoroalkyl substances (PFASs) are emerging environmental contaminants of global concern. This study assessed the acute and multigenerational toxicity of perfluorooctanoic acid (PFOA) and its alternative, hexafluoropropylene oxide dimer acid (HFPO-DA, also commercially known as GenX), in the marine rotifer Brachionus plicatilis, in the presence of 80 nm and 5 μm MNPs. Acute toxicity tests demonstrated that MNPs enhanced the lethality and reproductive toxicity of both PFOA and GenX in a size-dependent manner. At the population level, MNPs exacerbated the inhibitory effects of these compounds on population growth. In multigenerational assays, fecundity was identified as the most sensitive life-history trait, exhibiting cumulative multigenerational impairments that were more pronounced in the presence of NPs. This trend aligned with the expression patterns of reproduction-related genes. Transcriptomic analysis further showed that co-exposure to NPs increased the number of differentially expressed genes, particularly those involved in metabolic and steroid biosynthesis pathways, suggesting elevated energy demands and reproductive toxicity. Collectively, these findings highlight the necessity of incorporating mixture toxicity and multigenerational effects into risk assessment frameworks to achieve more realistic chemical risk characterization and management.
{"title":"Micro/Nanoplastics enhance multigenerational reproductive toxicity of legacy and alternative per- and polyfluoroalkyl substances in the marine rotifer Brachionus plicatilis","authors":"Tao Sun, Huifeng Wu","doi":"10.1016/j.envpol.2026.127791","DOIUrl":"https://doi.org/10.1016/j.envpol.2026.127791","url":null,"abstract":"Micro/Nanoplastics (MNPs) and per- and polyfluoroalkyl substances (PFASs) are emerging environmental contaminants of global concern. This study assessed the acute and multigenerational toxicity of perfluorooctanoic acid (PFOA) and its alternative, hexafluoropropylene oxide dimer acid (HFPO-DA, also commercially known as GenX), in the marine rotifer <ce:italic>Brachionus plicatilis</ce:italic>, in the presence of 80 nm and 5 μm MNPs. Acute toxicity tests demonstrated that MNPs enhanced the lethality and reproductive toxicity of both PFOA and GenX in a size-dependent manner. At the population level, MNPs exacerbated the inhibitory effects of these compounds on population growth. In multigenerational assays, fecundity was identified as the most sensitive life-history trait, exhibiting cumulative multigenerational impairments that were more pronounced in the presence of NPs. This trend aligned with the expression patterns of reproduction-related genes. Transcriptomic analysis further showed that co-exposure to NPs increased the number of differentially expressed genes, particularly those involved in metabolic and steroid biosynthesis pathways, suggesting elevated energy demands and reproductive toxicity. Collectively, these findings highlight the necessity of incorporating mixture toxicity and multigenerational effects into risk assessment frameworks to achieve more realistic chemical risk characterization and management.","PeriodicalId":311,"journal":{"name":"Environmental Pollution","volume":"93 1","pages":""},"PeriodicalIF":8.9,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146589","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}
Pub Date : 2026-02-09DOI: 10.1016/j.marpolbul.2026.119380
Peter G. Ryan, Azwianewi B. Makhado, Thando Cebekhulu, Robert J.M. Crawford, Bruce M. Dyer, Makhudu J. Masotla, Vonica Perold, Maelle Connan
Long-term monitoring of litter stranding on remote islands is an efficient way to track changes in the abundance and composition of floating marine litter. Over 30 years from 1993 to 2024, most beach litter at sub-Antarctic Marion Island derived from offshore sources (95%). The proportion of local, land-based litter decreased from 12% in 1993–1997 to <1% in 2019–2023, mainly due to improved solid waste management at the island's research station. Local litter had a much higher proportion of non-plastic items (68%), especially wood (32%) and metal (22%), than litter items from offshore sources, which were mostly made of plastic (94%). The abundance of fishing gear peaked in the 1990s, when there was a large fishery for Patagonian toothfish (Dissostichus eleginoides) around the island. However, even then, fishing gear comprised only 9% of offshore litter items (7% over the whole study period). Bottles (60%) and pieces of foamed polystyrene packaging (17%) accounted for most offshore litter items. The abundance of offshore litter decreased from 1993 to the early 2000s (change point 2004, 95% CI: 2000–2008), then increased until 2023, mainly due to an increase in the numbers of plastic bottles washing ashore. Our results indicate a worrying increase in general household waste at this remote island in the Southern Ocean.
{"title":"Increases in plastic bottles washing ashore on sub-Antarctic Marion Island","authors":"Peter G. Ryan, Azwianewi B. Makhado, Thando Cebekhulu, Robert J.M. Crawford, Bruce M. Dyer, Makhudu J. Masotla, Vonica Perold, Maelle Connan","doi":"10.1016/j.marpolbul.2026.119380","DOIUrl":"https://doi.org/10.1016/j.marpolbul.2026.119380","url":null,"abstract":"Long-term monitoring of litter stranding on remote islands is an efficient way to track changes in the abundance and composition of floating marine litter. Over 30 years from 1993 to 2024, most beach litter at sub-Antarctic Marion Island derived from offshore sources (95%). The proportion of local, land-based litter decreased from 12% in 1993–1997 to <1% in 2019–2023, mainly due to improved solid waste management at the island's research station. Local litter had a much higher proportion of non-plastic items (68%), especially wood (32%) and metal (22%), than litter items from offshore sources, which were mostly made of plastic (94%). The abundance of fishing gear peaked in the 1990s, when there was a large fishery for Patagonian toothfish (<ce:italic>Dissostichus eleginoides</ce:italic>) around the island. However, even then, fishing gear comprised only 9% of offshore litter items (7% over the whole study period). Bottles (60%) and pieces of foamed polystyrene packaging (17%) accounted for most offshore litter items. The abundance of offshore litter decreased from 1993 to the early 2000s (change point 2004, 95% CI: 2000–2008), then increased until 2023, mainly due to an increase in the numbers of plastic bottles washing ashore. Our results indicate a worrying increase in general household waste at this remote island in the Southern Ocean.","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"11 1","pages":""},"PeriodicalIF":5.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146836","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}
Stresses (e.g., high temperature, drought, and pests) can reshape the structure of root-associated microbial communities, but how to discover functional microbial community assembly to support plant health remains a great challenge. Here we found that root-knot nematode (RKN) infection restructured the rhizosphere bacterial community in RKN-susceptible cucumber plants, regardless of the soil type. We isolated a Rhizobium pusense strain, TYQ1, which was significantly enriched following RKN infection. This strain not only directly inhibited RKNs but also caused the restructuring of the rhizobacterial community, thereby leading to the enrichment of multiple biomarker species. These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network, further strengthening the colonization of TYQ1 in the rhizosphere. Ultimately, the TYQ1-centered synthetic community exhibited more efficient and stable inhibition of RKNs. These findings highlight that stress-induced recruitment of keystone species can guide functional microbial community assembly to synergistically enhance plant health.
{"title":"Stress-induced keystone species facilitate functional microbial community assembly to suppress root-knot nematodes for susceptible plants.","authors":"Xingqun Liu, Mengyuan Song, Zhicheng Xue, Qiannan Zhang, Lihong Gao, Yongqiang Tian","doi":"10.1093/ismejo/wrag022","DOIUrl":"https://doi.org/10.1093/ismejo/wrag022","url":null,"abstract":"<p><p>Stresses (e.g., high temperature, drought, and pests) can reshape the structure of root-associated microbial communities, but how to discover functional microbial community assembly to support plant health remains a great challenge. Here we found that root-knot nematode (RKN) infection restructured the rhizosphere bacterial community in RKN-susceptible cucumber plants, regardless of the soil type. We isolated a Rhizobium pusense strain, TYQ1, which was significantly enriched following RKN infection. This strain not only directly inhibited RKNs but also caused the restructuring of the rhizobacterial community, thereby leading to the enrichment of multiple biomarker species. These enriched microorganisms, in collaboration with TYQ1, enhanced the biofilm-forming ability of the community and established a tightly interconnected metabolic interaction network, further strengthening the colonization of TYQ1 in the rhizosphere. Ultimately, the TYQ1-centered synthetic community exhibited more efficient and stable inhibition of RKNs. These findings highlight that stress-induced recruitment of keystone species can guide functional microbial community assembly to synergistically enhance plant health.</p>","PeriodicalId":50271,"journal":{"name":"ISME Journal","volume":" ","pages":""},"PeriodicalIF":10.0,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146144629","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}
Rachel M. Pilla, Natalie A. Griffiths, Carly Hansen, R. Trent Jett, Michael W. Jones, Nikki J. Jones, Trystan A. Bordeau
Hydropower reservoirs contribute to methane (CH 4 ) and carbon dioxide (CO 2 ) emissions, like all aquatic ecosystems. Unique to hydropower reservoirs are degassing emissions that occur when deep‐water intakes move water with high CH 4 and CO 2 concentrations through turbines, leading to the release of these gases. However, few studies from hydropower reservoirs have measured seasonal variability and drivers of degassing fluxes, especially in temperate systems. We measured monthly degassing emissions in temperate Douglas Reservoir (Tennessee, USA) from 2023 to 2024. We found that degassing fluxes were highest in the summertime, and deep‐water CH 4 and CO 2 concentrations were predictable by deep‐water dissolved oxygen (DO) concentrations. Degassing emissions accounted for 37–62% of annually estimated CH 4 emissions, outweighing ebullitive emissions during summer months. We highlight the value of using DO data to estimate deep‐water CH 4 and CO 2 concentrations and degassing fluxes at higher temporal resolution to improve annualization and extrapolation of reservoir degassing emissions at broader scales.
{"title":"Degassing fluxes in a temperate hydropower reservoir predictable by deep‐water dissolved oxygen but highly sensitive to discharge variability","authors":"Rachel M. Pilla, Natalie A. Griffiths, Carly Hansen, R. Trent Jett, Michael W. Jones, Nikki J. Jones, Trystan A. Bordeau","doi":"10.1002/lol2.70108","DOIUrl":"https://doi.org/10.1002/lol2.70108","url":null,"abstract":"Hydropower reservoirs contribute to methane (CH <jats:sub>4</jats:sub> ) and carbon dioxide (CO <jats:sub>2</jats:sub> ) emissions, like all aquatic ecosystems. Unique to hydropower reservoirs are degassing emissions that occur when deep‐water intakes move water with high CH <jats:sub>4</jats:sub> and CO <jats:sub>2</jats:sub> concentrations through turbines, leading to the release of these gases. However, few studies from hydropower reservoirs have measured seasonal variability and drivers of degassing fluxes, especially in temperate systems. We measured monthly degassing emissions in temperate Douglas Reservoir (Tennessee, USA) from 2023 to 2024. We found that degassing fluxes were highest in the summertime, and deep‐water CH <jats:sub>4</jats:sub> and CO <jats:sub>2</jats:sub> concentrations were predictable by deep‐water dissolved oxygen (DO) concentrations. Degassing emissions accounted for 37–62% of annually estimated CH <jats:sub>4</jats:sub> emissions, outweighing ebullitive emissions during summer months. We highlight the value of using DO data to estimate deep‐water CH <jats:sub>4</jats:sub> and CO <jats:sub>2</jats:sub> concentrations and degassing fluxes at higher temporal resolution to improve annualization and extrapolation of reservoir degassing emissions at broader scales.","PeriodicalId":18128,"journal":{"name":"Limnology and Oceanography Letters","volume":"45 1","pages":""},"PeriodicalIF":7.8,"publicationDate":"2026-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146146098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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