期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到3,287篇文章
< 1 2 … 165 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Co-occurrence of organophosphate triesters and diesters in coral polyps,algae,and sediments from Sanya,China:di-OPEs having direct commercial applications? 认领 引用 被引量：1
1
作者 Qinru Xiao Wenchao Zhu +3 位作者 Sisi Yu Jinfeng Fu Huixiong Lü Shaoyou Lu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期671-681,共11页
The extensive utilization of organophosphate esters(OPEs)as industrial additives has resulted in their pervasive presence in the environment,with their broader impacts remaining largely unexplored.The current investig... The extensive utilization of organophosphate esters(OPEs)as industrial additives has resulted in their pervasive presence in the environment,with their broader impacts remaining largely unexplored.The current investigation gathered coral polyps,algae,and sediment samples from Sanya,China,and concurrently analyzed both organophosphate triesters(tri-OPEs)and diesters(di-OPEs)to elucidate their potential origins and environmental impacts.The findings reveal a diverse array of tri-OPEs and di-OPEs present in the three marine components,and the levels of emerging tri-OPEs are lower than that of traditional tri-OPEs.Tris(2-butoxyethyl)phosphate(TBOEP)was the predominant traditional tri-OPE in coral polyps,algae,and sediments,comprising 60%,48%,and 54%,respectively.As for di-OPEs,bis(2-ethylhexyl)phosphate(BEHP)exhibited the highest abundance in coral polyps(42%)and sediments(79%),while the profiles of di-OPEs in algae were highest in bis(2,4-di-tert-butylphenyl)phosphate(B2,4DtBPP,46%).The results of the correlation analysis indicated that certain traditional and emerging tri-OPEs(such as tributyl phosphate(TBP)and isodecyl diphenyl phosphate(IDDPP),r=0.636,p<0.001)have the potential common emission sources,whereas di-OPEs are likely derived from distinct origins,including the degradation of tri-OPEs and direct commercial utilization.Therefore,this study provides evidence suggesting that di-OPEs found in coral polyps,algae,and sediments may originate from direct commercial applications. 展开更多
关键词 Organophosphate triesters(tri-OPEs) Organophosphate diesters(di-OPEs) Coral polyps Algae Sediments
暂未订购 下载PDF
Quantitative and qualitative comparison of grain-size parameters in different types of sediments using graphic and moment methods 认领 引用
2
作者 Yuehua Qi Mingliang Li +4 位作者 Gaocong Li Jieping Tang Lintao Zhao Yaping Wang Mingming Yuan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第2期175-188,共14页
Previous studies have explored the differences in sediment grain-size parameters calculated using the Folk and Ward graphic method and the Friedman moment method.However,in terms of both quantitative and qualitative r... Previous studies have explored the differences in sediment grain-size parameters calculated using the Folk and Ward graphic method and the Friedman moment method.However,in terms of both quantitative and qualitative results for different types of sediment,systematic analysis of the consistency between two methods is still relatively scarce.In this study,we selected Leizhou Bay,Jiangsu tidal flats,and the Changjiang River Estuary as typical research areas,where a total of 608 sediment samples(surface sediments,short cores,and suspended sediments)from tidal flat and estuarine environments were analyzed.The consistency of the two methods in quantitative results of grain-size parameters and qualitative description was evaluated.The results indicate that in terms of quantitative parameters,the mean grain size and sorting obtained from the two methods show high consistency(R2≥0.91)across all three types of sediments.The skewness parameter of suspended sediments is significantly correlated(R2=0.72),but the correlation for skewness in surface sediments and short cores is low(R2≤0.11).The kurtosis parameter shows low correlation across all sediment types(R2≤0.20).In terms of qualitative description of sediment grain-size parameters,the sorting consistency of suspended sediments reaches 100%,far exceeding that of surface sediments(72.81%)and short cores(69.23%).Additionally,the skewness consistency(77.10%)and kurtosis consistency(73.83%)for suspended sediments are also higher than those for surface sediments(50.87%,52.34%)and short cores(65.38%,55.77%).These results suggest that suspended sediments exhibit higher compatibility with both methods compared to surface and short core sediments,with better adaptability in both quantitative results and qualitative descriptions.However,the correlation of quantitative results still does not fully reflect the consistency of qualitative descriptions,especially as for skewness and kurtosis.This study provides a case involving various types of sediments,including surface sediments,short cores,and suspended sediments,helping deepen the understanding of the differences in grain-size parameters.The findings provide practical guidance for selecting appropriate sedimentological methodologies. 展开更多
关键词 surface sediments short cores suspended sediments qualitative description
暂未订购 下载PDF
Short-and medium-chained chlorinated paraffins in soils and sediments in China:Spatiotemporal distributions,ecological risks,and driving mechanisms 认领 引用
3
作者 Qiang Li Ying Cao +4 位作者 Liansheng He Cunfu Gao Tian Meng Yafeng Liu Xiaoxue Liu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第4期209-219,共11页
Comprehensive analysis of the spatiotemporal distributions,homolog patterns,ecological risks,and driving mechanisms of short-chained chlorinated paraffins(SCCPs)and medium-chained chlorinated paraffins(MCCPs)in Chines... Comprehensive analysis of the spatiotemporal distributions,homolog patterns,ecological risks,and driving mechanisms of short-chained chlorinated paraffins(SCCPs)and medium-chained chlorinated paraffins(MCCPs)in Chinese soils and sediments is crucial for pollution identification and risk control.This study collected and analyzed literature published from 2011 to 2024,including information on SCCPs and MCCPs in soils and sediments from about 130 cities in 32 provinces of China.The results showed that SCCP and MCCP contamination in soils was mainly low-risk.In contrast,the sediment results were mainly medium-risk,with medium-and high-risk sites primarily distributed in China’s eastern and central provinces.From 2006 to 2022,the contents of chlorinated paraffins(CPs)in soils and sediments in the study cases in China showed a gradual upward trend in general,and the accumulation of SCCPs showed a stable or decreasing trend from about 2015.In Chinese soils and sediments,the proportion of CP congeners with shorter carbon chains was more significant,among which C10 and C14 were the main carbon congeners of SCCPs and MCCPs,respectively.According to the geodetector,the accumulation of SCCPs and MCCPs was influenced by a combination of pollution sources,diffusion pathways,and receptor attributes,with population density,normalized difference vegetation index(NDVI),and soil type being the main drivers.These results provided a reference for the changing characteristics and influencing factors of SCCP and MCCP contamination in soils and sediments nationwide. 展开更多
关键词 Chlorinated paraffins Soils Sediments Spatiotemporal distributions Ecological risks Geodetector model
暂未订购 下载PDF
Unlocking the seal capacity of unconsolidated Quaternary hydrate-bearing sediments:Carbon isotope gradients as a proxy for dynamic gas trapping efficiency 认领 引用
4
作者 Ya-Zhou Liu Jian-Hui Zeng +3 位作者 Jun-Cheng Qiao Gui-Wen Wang Ke-Liang Dong Shu-Ning Liu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1588-1605,共18页
Submarine gas hydrate systems store vast carbon inventories(∼1500–12,400 Gt C)yet pose dual risks as potential geohazard multipliers and climate feedback agents under oceanic warming.Conventional seal assessment fai... Submarine gas hydrate systems store vast carbon inventories(∼1500–12,400 Gt C)yet pose dual risks as potential geohazard multipliers and climate feedback agents under oceanic warming.Conventional seal assessment fails catastrophically in unconsolidated Quaternary hydrate-bearing sediments due to core-retrieval artifacts,hydrate morphology controls on capillary trapping,and meter-scale heterogeneity unresolved by seismic methods.Here,we pioneer methane carbon isotope(δ13C1)gradients as a dynamic proxy for seal capacity in the Qiongdongnan Basin.Integrating petrographic features,natural gas geochemical characteristics,downhole logging data,and principal component analysis(PCA)from six wells,we:(1)quantified the thermogenic gas contribution of wells W6 and W8 to be 55%–73%,and that of well W1 to be 28%–32%via binary mixing models,(2)establish that methane carbon isotope gradients>0.5‰/m diagnose effective capillary barriers,correlating with zones of pore-throat disconnection,and(3)develop a PCA-integrated logging model(cumulative variance:84.02%,R2=0.78)predicting seal capacity from conventional petrophysical parameters.Furthermore,the results validate a charge-dynamic barrier-mixing accumulation model where thermogenic gas influx elevates hydrate saturation,creating self-sealing horizons that trap underlying microbial gases and subsequently charged thermogenic gases,recorded in diagnostic methane carbon isotope reversals.This approach bridges molecular-scale fractionation and reservoir-scale processes,enabling targeted identification of high-integrity seals for optimized carbon storage and safer hydrate exploitation in rapidly deposited marginal basins. 展开更多
关键词 Seal capacity Unconsolidated hydrate-bearing sediments Carbon isotope gradients Accumulation model Qiongdongnan Basin
暂未订购 下载PDF
Metagenomic investigations of microbial community response and antibiotic resistance genes in river sediments polluted by perfluoroalkyl acids 认领 引用
5
作者 Nannan Lu Zhenqi Du +4 位作者 Guixue Feng Xiaodong Xin Minghai Che Ruibao Jia Wenhai Chu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第2期300-307,共8页
Liquid-solid phase transfer promotes the interaction of perfluoroalkyl acids(PFAAs)with the microbial system of river sediments,which may affect the environmental behavior of antibiotic resistance genes(ARGs)contained... Liquid-solid phase transfer promotes the interaction of perfluoroalkyl acids(PFAAs)with the microbial system of river sediments,which may affect the environmental behavior of antibiotic resistance genes(ARGs)contained in benthic environments.Sediments collected from the receiving water of the largest fluoropolymer production facility in China were analyzed to investigate the impact of PFAAs on microbial communities and ARG profiles.The main contributors to the PFAAs were perfluorooctanoic acid and perfluorobutanoic acid,whose proportions(86.9%-93.4%)in the downstream surface sediments affected by industrial effluents were significantly higher than in the corresponding upstream samples(53.3%).A reduction in microbial diversity and richness was observed in the presence of high concentrations of PFAAs at the downstream sites.144 ARG subtypes,including three high-risk subtypes(bacA,aac(6′)-I and aadA),were identified in sediment samples.The discharge of fluorochemical effluents also results in a reduction of ARG diversity at subtype level.PFAAs exert a pronounced influence on the profile of ARGs in sediment.PFAAs and water quality parameters(e.g.pH and total phosphorus)were key drivers of the microbial community composition in the sediment.The regulation of microbial communities by PFAAs may represent an important pathway by which these compounds affect ARG profiles. 展开更多
关键词 Perfluoroalkyl acids(PFAAs) Sediments Antibiotic resistance genes(ARGs) Microbial community Metagenomics
暂未订购 下载PDF
Multi-method characterization of grain-size sensitive components in deep-sea sediments from the Zhongnan Seamount,South China Sea:implications for monsoon-volcanic interactions and turbidity current events 认领 引用
6
作者 Yuanfu Yue Xintian Yu +2 位作者 Liuying He Xinmeng Yuan Kefu Yu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第2期162-174,共13页
Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS)... Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS).This study presents the first systematic comparison of three GSCS techniques,namely standard deviation(STD),endmember modeling(EMM),and principal component analysis(PCA).These methods are applied specifically to sediment core GT-06 recovered from the Zhongnan Seamount in the central South China Sea.By integrating grain-size unmixing with complementary proxies,including magnetic susceptibility(MS)and loss on ignition(LOI),we assess the resolving power of each method and relate the resulting components to site-specific sedimentary processes(e.g.,summer monsoon,volcanic activity,seamount collapse-induced turbidity currents).Key results show that all methods identified three dominant grain-size ranges(clay,silt-sand,coarse sand)with robust inter-method correlations.Critically,EMM and PCA uniquely resolved a volcanic-derived silt component(EM2)that was undetectable using the STD method,highlighting a key limitation of STD in complex settings.Four geologically meaningful end-members were identified:(1)fine-grained terrigenous clay linked to the East Asian summer monsoon(EASM),(2)volcanic detritus reflecting Quaternary submarine eruptions,(3)siliceous biogenic debris indicative of monsoon-modulated productivity,and(4)coarse calcareous fragments associated with seamount collapse-induced turbidity currents.The results highlight the superior ability of EMM/PCA to resolve complex signals,whereas STD serves as an efficient yet limited tool for first-order screening.Together,these methods form a site-adapted framework for tectonically active deep-sea seamounts:EMM/PCA enabling fine-scale interpretation of monsoon-volcanic-turbidity interactions,and STD supports rapid large-dataset comparison.This workflow improves the reliability of paleoenvironmental reconstructions in mixed-signal settings like the Zhongnan Seamount. 展开更多
关键词 grain-size sensitive component separation South China Sea Zhongnan Seamount East Asian monsoon volcanic activity turbidity currents deep-sea sediments
暂未订购 下载PDF
Environmental sustainability assessment of remediation alternatives for highly contaminated marine sediments 认领 引用
7
作者 Alessia Amato Alessandro Becci +2 位作者 Giulia Merli Francesca Beolchini Antonio Dell’Anno 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第1期731-740,共10页
This study compares the environmental sustainability of five alternatives for the remediation of marine sediments of one of the most polluted coastal sites in Europe(Bagnoli-Coroglio bay,Mediterranean Sea),using the L... This study compares the environmental sustainability of five alternatives for the remediation of marine sediments of one of the most polluted coastal sites in Europe(Bagnoli-Coroglio bay,Mediterranean Sea),using the Life Cycle Assessment(LCA)methodology.The treatments are either in-situ or exsitu,the latter requiring an initial dredging to transport the contaminated sediments to the management site.More in detail,four ex-situ remediation technologies based on landfilling,bioremediation,electrokinetic technique and soil washing were identified.These technologies are compared to an in-situ strategy currently under validation for enhancing bioremediation of the polluted sediments of the Bagnoli-Coroglio site.Our results indicate that the disposal in landfilling site is the worst option in most categories(e.g.,650 kg CO2 eq. of treated sediment,considering the nearest landfilling site),followed by the bioremediation,mainly due to the high energy demand.Electrokinetic remediation,soil washing,and innovative in-situ technology represent the most sustainable options.In particular,the new in-situ technology appears to be the least impacting in all categories(e.g.,54 kg CO2 eq. of treated sediment),although it is expected to require longer treatment time(estimated up to 12 months based on its potential efficiency).It can reduce the impact on climate change more than 12 times compared to the disposal and 7 times compared to bioremediation in addition to the possibility to avoideduce the dredging operations and the consequent dispersion of pollutants.The results open relevant perspectives towards more eco-sustainable and costly effective actions for the reclamation of contaminated marine sediments. 展开更多
关键词 Life cycle assessment Marine sediments contamination Electrokinetic Bioremediation Ex-situ remediation In-situ remediation
暂未订购 下载PDF
Synergistic trade-off between desertification and lake evolution in the eastern Qinghai Lake region since the late Last Glacial Interstadial:Evidence from aeolian sediments 认领 引用
8
作者 HU Mengjun XU Aokang 《Journal of Arid Land》 SCIE CAS CSCD 2026年第3期387-405,共19页
Aeolian sediments in the eastern Qinghai Lake region,China serve as sensitive paleoclimate archives,offering an ideal window into past environmental conditions.This study investigated the Dashuitang(QDST)profile in th... Aeolian sediments in the eastern Qinghai Lake region,China serve as sensitive paleoclimate archives,offering an ideal window into past environmental conditions.This study investigated the Dashuitang(QDST)profile in the eastern Qinghai Lake region by integrating sediment grain size,chroma,and magnetic susceptibility(MS)proxies to reconstruct the regional environmental evolution since the Last Glacial Interstadial and to investigate its relationship with the water level fluctuations of Qinghai Lake.Grain size end-member modeling analysis(EMMA)identified three end-members:end-member 1(EM1)represented fine-grained material transported over longer distances through mixing processes,which could reveal the regional moisture conditions;end-member 2(EM2)primarily consisted of coarse-grained material from nearby sources transported via saltation or creep,indicating the intensity of the winter monsoon;and end-member 3(EM3)mainly reflected deposition from dust storm events controlled by regional low-altitude wind systems.In addition,the regional environmental sequence demonstrated coherence with other records,collectively elucidating the sub-orbital-scale dynamics of the Asian monsoon.The environmental sequence was divided into four principal phases on the basis of sedimentary characteristics and climatic responses:the late Last Glacial Interstadial,Last Glacial Maximum,Last Deglaciation,and Holocene phases.Additionally,the results of this study revealed that there is a close linkage between desertification and lake evolution in the eastern Qinghai Lake region.Since the Last Glacial Interstadial,desertification and lake evolution processes have generally exhibited a trade-off relationship,wherein lake level decline and desert expansion exhibited a direct positive feedback.However,during the early period of the Late Holocene(approximately 2.80–1.50 ka BP),a synergistic response pattern emerged,characterized by relatively high lake levels alongside moderate desert expansion,reflecting an asymmetric decoupling mechanism between the hydrological processes and aeolian dynamics during climatic transition periods.This study provides important insights for predicting the future evolution trends of lake-desert systems under climate change. 展开更多
关键词 desertification aeolian sediments late Last Glacial Interstadial synergistic trade-off end-member modeling analysis Qinghai Lake
暂未订购 下载PDF
Development of an innovative permeability model for hydrate-bearing sediments under creep conditions:Effects of particle shape and non-uniform particle distribution 认领 引用
9
作者 Yi-Han Shang Gang Lei +2 位作者 Xiao-Yu Yuan Ke-Yi Wang Kai-Xuan Qiu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期524-540,共17页
Prolonged gas hydrate exploitation induces reservoir creep,leading to pore structure deformation,permeability reduction,and elevated risks of wellbore instability,ultimately impeding sustainable resource recovery.Accu... Prolonged gas hydrate exploitation induces reservoir creep,leading to pore structure deformation,permeability reduction,and elevated risks of wellbore instability,ultimately impeding sustainable resource recovery.Accurate modeling of permeability evolution in hydrate-bearing sediments(HBS)under creep conditions is therefore crucial.However,the non-uniform distribution and irregular morphology of sediment particles complicate pore structures and fluid pathways,posing significant challenges for prediction.This study proposes a novel theoretical permeability model for HBS that incorporates the degree of non-uniform particle distribution,particle shape,pore structure creep,hydrate saturation,and hydrate pore morphology.Model validation against public datasets confirms its predictive capability.Sensitivity analysis reveals that pore structure creep,the degree of non-uniform particle distribution,and particle shape significantly influence permeability,with increased nonuniformity or larger particle aspect ratios leading to reduced permeability.For instance,after 40 h of creep,permeability decreases from 5 to 1.3 mD as the damage-related parameterβincreases from 0.4 to1.0.The proposed model advances understanding of permeability evolution in HBS and provides a theoretical basis for the long-term development of natural gas hydrates. 展开更多
关键词 Hydrate-bearing sediments Permeability Creep Non-uniform particle distribution Particle shape Hydrate pore morphology
暂未订购 下载PDF
Grain Size Characteristics and Spatial Variation of Sediments in Taklamakan Sand Sea,China 认领 引用
10
作者 WANG Siqi ZHANG Zhengcai +3 位作者 DONG Zhibao PAN Kaijia ZHANG Yan LIU Ting 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第5期772-784,共13页
Grain size in aeolian sediments is fundamental to studying geomorphic evolution,arising from interactions among fluvial deposits,sediment sources and aeolian airflow.Previous studies on grain size in the Taklamakan Sa... Grain size in aeolian sediments is fundamental to studying geomorphic evolution,arising from interactions among fluvial deposits,sediment sources and aeolian airflow.Previous studies on grain size in the Taklamakan Sand Sea of China have mainly focused on individual dunes,overlooking variations among different dune types.Although spatial patterns of grain size parameters are well-documented in other Chinese deserts,they remain poorly understood in the Taklamakan.To supplement this aspect,700 surface sediment samples were collected from the Taklamakan Sand Sea,including transverse dunes,linear dunes,pyramid dunes,reticulate dunes,vegetated dunes and interdune areas,to characterize grain size distribution across dune types and the sand sea.The Taklamakan Sand Sea is dominated by fine sand and very fine sand,with minimal proportions of coarse sand and larger fractions,suggesting that sand transport predominantly occurs through saltation.Grain size characteristics differ significantly among dune types,indicating that grain size characteristics may be a dune classification index in geomorphology.The significant correlation between the grain size characteristics of transverse dunes and linear dunes suggests a possible transformation relationship between these dune types in the Taklamakan Sand Sea.Spatial variations in grain size are controlled by dune type,local geomorphology,and wind regimes.Higher wind speed in the east caused the mean grain size of aeolian sands to decrease from east to west along the northeast wind.Sand sorting decreases from east to west and then increases,whereas skewness and kurtosis show no clear spatial trends.Overall,distinct grain size variations among dune types reveal previously unrecognized evolutionary connections between aeolian landforms.The spatial distribution of grain size parameters clarifies sediment provenance and transport processes in the Taklamakan Sand Sea. 展开更多
关键词 grain size aeolian sediments dune types spatial variation Taklamakan Sand Sea,China
暂未订购 下载PDF
Unconventional rare earth element archives in the energy transition era:The Cenozoic organic sediments from west coast of southern India 认领 引用
11
作者 P.Athira Chandran Arunima M.Lal +6 位作者 Arun J.John G.K.Indu Ajai M.Lal Runcie Paul Mathews M.Santosh S.Rajesh P.E.Binusarma 《Energy Geoscience》 EI CAS CSCD 2026年第1期116-133,共18页
Organic-rich sediments represent vital components of Earth's geochemical cycles, acting both as potential hydrocarbon and coal reservoirs and as unconventional archives for critical metals such as rare earth eleme... Organic-rich sediments represent vital components of Earth's geochemical cycles, acting both as potential hydrocarbon and coal reservoirs and as unconventional archives for critical metals such as rare earth elements(REEs). With the growing emphasis on clean energy technologies, the Cenozoic organic deposits of India have gained renewed significance;however, those from the southern state of Kerala remain understudied. This study investigates lignite and associated carbonaceous sediments from the Cheruvathur and Warkalli Formations using a multi-proxy approach integrating organic petrography,infrared spectroscopy, stable carbon isotopes, and REE geochemistry. The lignite exhibits huminite dominance with Type Ⅲ kerogen, deposited in a wet, mesotropic bog forest swamp under anoxic conditions. The mineral assemblage, dominated by kaolinite, quartz, illite, montmorillonite, feldspar,and pyrite/marcasite, reflects strong chemical alteration in a reducing environment. The δ13C values(-25.1 to-27.3) indicate a C3 angiosperm source and deposition in tropical to subtropical swamp settings. REE patterns reveal LREE enrichment in carbonaceous shales and HREE enrichment in lignite,with distinct Ce, Eu, and Gd anomalies associated with provenance and redox conditions. The findings provide new insights into the paleoenvironmental evolution of Kerala's Cenozoic basins and highlight their potential as unconventional REE-bearing resources in the context of the global energy transition. 展开更多
关键词 Cenozoic sediments Rare earth elements Warkalli formation Lignite deposits Paleo-environment
暂未订购 下载PDF
Salt-mediated shifts in microbial communities in benzotriazole UV stabilizer-contaminated sediments:Insights into physicochemical properties,functional diversity,and structural changes 认领 引用 被引量：1
12
作者 Qiang Li Peifang Wang +2 位作者 Bin Hu Qiutong Jin Haihua Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期454-464,共11页
The microbial community in aquatic ecosystems have received increased attention.However,information about the effect of benzotriazole UV stabilizers on microbial ecosystems in sediment remain poorly understood,particu... The microbial community in aquatic ecosystems have received increased attention.However,information about the effect of benzotriazole UV stabilizers on microbial ecosystems in sediment remain poorly understood,particularly their combined effects with dynamic environmental factors such as salinity fluctuations.Therefore,we conducted a 45-day sediment-incubation experiment through adding salt levels(0,0.86,and 4.30 g/L NaCl)and benzotriazole UV stabilizer-329(UV-329)concentrations(0,10,50 and 100 mg/kg).As a result,UV-329increased organic matter content,cation exchange capacity,and oxygen flux,and significantly suppressed microbial metabolic activity,as evidenced by a reduction in average well color development from 0.89 to 0.66.It also altered community composition by increasing Proteobacteria abundance from 45.8%to 54.2%,showing a significant positive correlation(p<0.01).Notably,after co-exposure to UV-329 and salt stress,the metabolic activity was further decreased,and Firmicutes were identified as a feature bacterial phylum.Metabolic differences caused by co-exposure were reflected in the utilization of two amino acids(L-Phenylalanine and L-Threonine),two carboxylic acids(D-Xylose and Itaconic acid),and Tween 80 on the Biolog ECO microplate.The activities of urease,dehydrogenase,fluorescein diacetate hydrolase and adenosine triphosphate(ATP)were significantly inhibited in high-concentration co-exposure groups(p<0.05).According to IBRV2 model,salinity enhanced the combined toxicological effect on sediments.Partial least squares path modeling showed that UV-329 and salt stress reshaped the feature bacterial phyla by directly driving sediment properties and enzymatic activities.This study provides theoretical support for the risk of UV-329 exposure under saline conditions. 展开更多
关键词 UV-329 Salt stress Co-exposure Bacterial diversity Sediment
暂未订购 下载PDF
Vertical distribution of redox-active sulfur and iron species in Karst Lake sediments and their implications for coupled iron-sulfur cycling 认领 引用
13
作者 Hao Wang Jian Zhu +1 位作者 Liao Peng Ruyi Zheng 《Acta Geochimica》 EI CAS CSCD 2026年第4期1134-1149,共16页
Lake sediments are key reservoirs for sulfur(S),iron(Fe),and their associated compounds,playing a central role in the coupled Fe-S biogeochemical cycle.However,the dynamics of this cycle vary greatly among lakes with ... Lake sediments are key reservoirs for sulfur(S),iron(Fe),and their associated compounds,playing a central role in the coupled Fe-S biogeochemical cycle.However,the dynamics of this cycle vary greatly among lakes with different pollution histories and redox conditions.To clarify how Fe-S cycling responds to varying geochemical environments,this study investigates the vertical distribution and speciation of multiple sulfur and iron forms,acid-volatile sulfide(AVS),elemental sulfur,Fe(Ⅲ),and Fe(Ⅱ),in sediments from three lakes in Guizhou,China—Maoshitou,Aha,and Hongfeng—which are characterized by distinct pollution and redox histories.We combined sequential extraction with sediment geochemical analysis to quantify the reactivity of Fe(Ⅲ)and explore its role in the coupled Fe-S processes.The results show that the three lakes exhibit contrasting redox environments,leading to markedly different vertical profiles of S and Fe species.In particular,Maoshitou Lake displays unusually high concentrations of dissolved elemental sulfur,reflecting unique redox transitions in its sediments.Elevated AVS concentrations in deeper,more reducing sediments reflect active sulfate reduction and the subsequent formation of iron sulfide minerals.In these environments,solid-phase Fe(Ⅲ),mainly as iron(oxyhydr)oxides,is reduced to Fe(Ⅱ),which then reacts with sulfide to form FeS minerals.These results highlight that differences in lake pollution history and oxidative conditions strongly influence Fe-S coupling and the transformation pathways of reactive Fe(Ⅲ)and reduced S species.The enhanced Fe(Ⅲ)reactivity observed in Maoshitou Lake underscores its pivotal role in regulating Fe-S biogeochemical cycling under varying redox regimes. 展开更多
关键词 Lake sediments Reduced sulfur Elemental sulfur Fe(III)reactivity Coupled iron-sulfur cycling
暂未订购 下载PDF
Permeability evolution and model of methane hydrate-bearing sediments under coupled shear strain,effective confining pressure,and hydrate saturation 认领 引用
14
作者 Tian-xiang Ao Le Zhao +3 位作者 Ming-zhong Gao Meng Xu Yi-kun Yang Ming-zhu Qi 《China Geology》 CAS CSCD 2026年第3期584-595,共12页
The permeability of methane hydrate-bearing sediments(MHBS)is a key parameter for evaluating reservoir exploitation potential and formulating efficient production strategies.In actual field development,MHBS exists in ... The permeability of methane hydrate-bearing sediments(MHBS)is a key parameter for evaluating reservoir exploitation potential and formulating efficient production strategies.In actual field development,MHBS exists in a complex environment characterized by stress-seepage coupling.Research on the permeability model of methane hydrate-bearing sediments under multi-factor coupling conditions remains scarce,limiting the assessment of methane hydrate(MH)reservoir hydrocarbon production potential and efficient development.This study used quartz sand and deep-sea clay from the South China Sea as matrix materials to generate MH,simulating MHBS.Systematic triaxial seepage experiments were conducted to assess the influence of multiple factors,including triaxial shear process,effective confining pressure,and hydrate saturation,on the permeability characteristics of MHBS.The results demonstrate the following:(1)During triaxial compression,permeability exhibits a nonlinear variation—first decreasing and then stabilizing or rebounding—with increasing shear strain,reflecting stress-induced pore structure evolution;(2)the permeability of MHBS decreases nonlinearly with increasing effective confining pressure,showing higher sensitivity in the low-pressure range.Effective confining pressure reduces sample permeability by compressing seepage channels,and this effect is more significant at the initial stages of stress growth;(3)hydrate saturation is negatively correlated with permeability,with the cementing effect of hydrates being the primary cause for the decrease in permeability of MHBS,also reducing the impact of effective confining pressure;(4)effective confining pressure,hydrate saturation,and shear strain have a coupled effect,jointly influencing the permeability of MHBS,but their relative weights vary and require specific consideration;(5)based on experimental data,a permeability prediction model considering the coupling effects of shear strain,effective confining pressure,and hydrate saturation was established.This model demonstrates excellent predictive accuracy and can be applied to forecast the hydrocarbon yield potential of MHBS under varying geological and engineering conditions,providing quantitative basis for reservoir evaluation and gas production prediction.This study bridges the gap between laboratory permeability characterization and field production capacity forecasting,offering critical theoretical and technical support for the sustainable development of marine gas hydrate resources. 展开更多
关键词 Hydrate Clean enegy Combustible ice Unconventional energy Exploitation potential assessment Hydrate-bearing sediments Triaxial test Hydrate saturation Effective confining pressure Shear strain Permeability evolution Seepage mechanism Multi-factor coupling model
暂未订购 下载PDF
Geochemical signatures of hydrothermal sediments on the ultraslow-spreading Gakkel Ridge,Arctic Ocean 认领 引用
15
作者 Wensheng XUE Yejian WANG +4 位作者 Zhongyan QIU Chi YANG Chunguo YANG Xinyu MA Tao ZHANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第2期603-615,共13页
More than 721 submarine hydrothermal fields have been documented globally,however,the characterization of hydrothermal systems beneath the ice-covered Arctic Ocean remains poorly constrained.During the 2021 JASMInE ex... More than 721 submarine hydrothermal fields have been documented globally,however,the characterization of hydrothermal systems beneath the ice-covered Arctic Ocean remains poorly constrained.During the 2021 JASMInE expedition,a 369-cm-long sediment core was recovered from the central rift valley of the Gakkel Ridge 96°E.The core is predominantly composed of terrigenous debris,Fe-(oxyhydr)oxides,volcanic glass,and hydrogenetic Mn oxides.Three hydrothermal-affected layers(HA1–HA3)within the upper 85 centimeters below seafloor(cmbsf)exhibit enrichment in Fe,Cu,Pb,P,V,Mg,Ca,and Na,associated with accumulation of Fe-(oxyhydr)oxides and volcanic glass.Among these,Layer HA2(13–16 centimeters below seafloor(cmbsf))displays the most intense hydrothermal signature,characterized by high concentrations of Fe(12.06–15.22 wt.%),Mn(2687–5465μg/g),Cu(245–373μg/g),and Pb(248–342μg/g),accompanied by reduced rare earth element(REE)concentrations,and shale-normalized patterns featuring negative Ce anomalies,and positive Eu anomalies.In comparison,Layers HA1(83–85 cmbsf)and HA3(6–7 cmbsf)exhibit only marginally elevated concentrations of hydrothermal-related elements(Fe,Cu,Pb,P,V)compared to pelagic background sediments,indicating a weaker hydrothermal influence.Overall,the observed coarsening of volcanic glass grain size and its increased abundance within hydrothermal-affected layers,coupled with diagnostic signatures from the Al-Fe-Mg ternary diagram and the detection of hydrothermal plume anomalies along the 100°E Axial Volcanic Ridge(AVR),collectively point to a basalt-hosted hydrothermal system associated with the AVR as the source of the hydrothermal signals recorded in the core.These findings reveal the geochemical fingerprints of hydrothermal materials in Arctic deep-sea sediments,offering new insights into their sources and formation processes in the ice-covered ocean. 展开更多
关键词 ice-covered ocean hydrothermal event sediment core major and trace element Gakkel Ridge
暂未订购 下载PDF
Sources,seasonal variations,and factors influencing the distribution of PAHs in the surface sediments and water column of the central Bohai Sea,China 认领 引用
16
作者 Jie GUO Tao LI +6 位作者 Shanwei LIU Yong JIN Chuanyuan WANG Diansheng JI Xiangyang ZHENG Chawei HOU Haitian TANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第2期634-649,共16页
This study investigated seasonal variations in the concentrations of 16 priority polycyclic aromatic hydrocarbons(Σ16 PAHs)in surface sediments of the central Bohai Sea during spring and summer 2022,to identify the u... This study investigated seasonal variations in the concentrations of 16 priority polycyclic aromatic hydrocarbons(Σ16 PAHs)in surface sediments of the central Bohai Sea during spring and summer 2022,to identify the underlying driving factors of seasonal changes.Principal component and multivariate linear regression analyses revealed that the PAHs were mainly originated from pyrolytic sources.Among 23 sampling stations,only one station had PHSs that could be derived from petroleum sources.The concentrations of dissolved PAHs in various water layers and seabottom surface sediments were measured,and the results show that the concentrations ofΣ16 dissolved PAHs in most stations were higher in spring than in summer.A comprehensive analysis was conducted to explore the potential factors influencing the seasonal variation of PAH concentrations in the surface sediments,suggesting that the adsorption and absorption of PAHs in water by phytoplankton indirectly affect the concentration of PAHs in sediment,and that the phenomenon of high PAH concentrations in spring and low PAH concentrations in summer is related to the re-suspension by high tidal currents and occasional strong winds in summer. 展开更多
关键词 polycyclic aromatic hydrocarbons(PAHs) central Bohai Sea sediment dissolved PAHs seasonal variation phytoplankton
暂未订购 下载PDF
High-precision classification of benthic habitat sediments in shallow waters of islands by multi-source data 认领 引用
17
作者 Qiuhua TANG Ningning LI +4 位作者 Yujie ZHANG Zhipeng DONG Yongling ZHENG Jingjing BAO Jingyu ZHANG 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第1期99-108,共10页
Benthic habitat mapping is an emerging discipline in the international marine field in recent years,providing an effective tool for marine spatial planning,marine ecological management,and decision-making applications... Benthic habitat mapping is an emerging discipline in the international marine field in recent years,providing an effective tool for marine spatial planning,marine ecological management,and decision-making applications.Seabed sediment classification is one of the main contents of seabed habitat mapping.In response to the impact of remote sensing imaging quality and the limitations of acoustic measurement range,where a single data source does not fully reflect the substrate type,we proposed a high-precision seabed habitat sediment classification method that integrates data from multiple sources.Based on WorldView-2 multi-spectral remote sensing image data and multibeam bathymetry data,constructed a random forests(RF)classifier with optimal feature selection.A seabed sediment classification experiment integrating optical remote sensing and acoustic remote sensing data was carried out in the shallow water area of Wuzhizhou Island,Hainan,South China.Different seabed sediment types,such as sand,seagrass,and coral reefs were effectively identified,with an overall classification accuracy of 92%.Experimental results show that RF matrix optimized by fusing multi-source remote sensing data for feature selection were better than the classification results of simple combinations of data sources,which improved the accuracy of seabed sediment classification.Therefore,the method proposed in this paper can be effectively applied to high-precision seabed sediment classification and habitat mapping around islands and reefs. 展开更多
关键词 Wuzhizhou Island marine remote sensing coastal mapping multi-spectral remote sensing shallow water reef seabed sediment classification benthic habitat mapping multi-source data fusion random forest(RF)
暂未订购 下载PDF
Particles,deposits and sediments:unravelling the complexities of IOL opacification 认领 引用
18
作者 Yu-Hang Zhang Su Xu +4 位作者 Wei Si Shan-Shan Du Jing-Zhi Shao Jing-Jing Liu Feng-Yan Zhang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第5期1008-1010,共3页
Dear Editor,We report a case illustrating the morphological and compositional characteristics of intraocular lens(IOL)turbidity.Hydrophilic IOL has been frequently used with the advancement of materials because of its... Dear Editor,We report a case illustrating the morphological and compositional characteristics of intraocular lens(IOL)turbidity.Hydrophilic IOL has been frequently used with the advancement of materials because of its good chemical stability and high-temperature resistance. 展开更多
关键词 iol opacification advancement materials morphological compositional characteristics particles hydrophilic iol deposits sediments
暂未订购 下载PDF
Factors influencing the occurrence and distribution of organophosphate esters in sediments by cascade reservoirs of the Wujiang River in Southwest China 认领 引用
19
作者 Xiaoying Li Yujie Wang +5 位作者 Yong Qin Yongsheng Chu Xueping Chen Ming Yang Jing Ma Fushun Wang 《Acta Geochimica》 EI CAS CSCD 2026年第2期205-216,共12页
An artificial reservoir,as a temporary host for various materials in a basin,faces the potential risk of organophosphate ester(OPE)enrichment in the sediment.In this study,in order to investigate the impacts of damrel... An artificial reservoir,as a temporary host for various materials in a basin,faces the potential risk of organophosphate ester(OPE)enrichment in the sediment.In this study,in order to investigate the impacts of damrelated water impoundment on OPEs,seven reservoirs in the Wujiang River(WJR)were investigated in January,April,July,and October 2017,and the occurrence and distribution of eight OPEs were evaluated.The results showed that the content of the eight OPEs ranged from 0.83 to 2745 ng/g dw.The main component was tris(2-chloroethyl)phosphate(TCEP).Spatially,the OPEs decreased from upstream to downstream.Temporally,the OPE content showed a trend of July>October≥January>April.Socioeconomic and hydrological factors had significant effects on the distribution of OPEs,and the empirical model of OPEs with gross domestic product(GDP)and reservoir age(RA)as parameters was established.This provided a basis for OPE estimation and treatment direction for the reservoir.In addition,the relevant data regarding OPEs and total organic carbon(TOC)in terrigenous sediments from previous studies showed a significant correlation(r=0.63,P<0.01).The significantly high risk quotient(RQ)estimated for OPEs,especially tris(methylphenyl)phosphate(TMPP)and triphenyl phosphate(TPHP),suggest potential adverse risk. 展开更多
关键词 Organophosphate esters(OPEs) Cascade reservoirs Surface sediment Wujiang River TOC Reservoir hydrology
暂未订购 下载PDF
P-phenylenediamines and their quinones in estuarine-coastal sediments of Zhejiang Province:Occurrence,prioritization,and risk assessment 认领 引用
20
作者 Zhou Wu Zhongyong Yan +10 位作者 Yanpeng Liang Qinglin Mu Zhaochao Deng Lijia Jiang Mingzhi Liu Guanghao Sun Zenghui Xu Zhendong Li Chunfang Zhang Yanhong Li Hanghai Zhou 《Emerging Contaminants》 CSCD 2026年第2期286-295,共10页
As emerging contaminants of concern,p-phenylenediamines(PPDs)and their quinone transformation products(PPD-Qs)serve as critical indicators of pollutant inputs from urban runoff and tire wear to coastal ecosystems.Howe... As emerging contaminants of concern,p-phenylenediamines(PPDs)and their quinone transformation products(PPD-Qs)serve as critical indicators of pollutant inputs from urban runoff and tire wear to coastal ecosystems.However,their occurrence,distribution,and pollution sources in Zhejiang's estuarine-coastal sediments remain uncharacterized.This study investigated the pollution levels and ecological risks of PPDs and PPD-Qs in estuarine and coastal sediments in Zhejiang Province.The results revealed the widespread occurrence of eight PPDs and seven PPD-Qs.The concentrations of Σ8PPDs in estuarine and coastal sediments were 3.13-9.03 ng/g dry weight(dw)and 2.30-23 ng/g dw,with N-Isopropyl-N′-phenyl-p-phenylenediamine(IPPD)being the predominant congener.Concentrations of Σ7PPD-Qs ranged from 1.64 to 4.35 ng/g dw in estuarine sediments and from 0.80 to 6.87 ng/g dw in coastal sediments,and were dominated by N,N′-Bis(methylphenyl)-1,4-benzenediamine quinone(DTPD-Q)and 6PPD-Q.Notably,a significant(P<0.05)positive correlation was observed between the concentrations of PPDs and PPD-Qs in estuarine sediments.Priority assessment identified that N,N′-Bis(2-naphthyl)-p-phenylenediamine(DNPD),N,N′-Bis(methylphenyl)-1,4-benzenediamine(DTPD),DTPD-Q,and 6PPD-Q were of highest priority.Moreover,6PPD-Q was identified as a medium or high ecological risk at all sites.This study provides critical baseline data and risk insights for emerging rubber-derived contaminants(PPDs/PPD-Qs),enabling targeted conservation strategies for ecologically vulnerable estuarine-coastal systems. 展开更多
关键词 P-phenylenediamines PPD-Quinones Sediment Risk quotient Priority identification
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 165 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈