检索结果-南通市图书馆

Integration of Chemical Methods and Biomarkers for Assessment of Chlorimuron-Ethyl Bioavailability in soil

Pedosphere 2016年第3期26卷 273-281页

作者： REN Wenjie WANG Meie ZHOU Qixing TENG Ying Key Laboratory of soil Environment and pollution Remediation of Chinese Academy of Sciences Institute of Soil ScienceChinese Academy of Sciences Key Laboratory of pollution Ecology and Environmental Engineering Institute of Applied EcologyChinese Academy of Sciences State Key Laboratory of Urban and Regional Ecology Research Centre for Eco-Environmental SciencesChinese Academy of Sciences Key Laboratory of pollution Processes and Environmental Criteria(Ministry of Education) College of Environmental Science and EngineeringNankai University

Bioavailability is a critical factor for assessing the environmental risk of organic pollutants in soil. In this study, extractions with 3 different solvents, including 2 aqueous solutions, calcium chloride(CaCl_2) and a phosphate buffer solution(PBS), and a mixture of aqueous solution and organic solvent, a PBS-methanol(8:2,volume/volume) mixture(PBS-M), were performed to assess the bioavailability of chlorimuron-ethyl in soil in comparison to a battery of toxicity tests in wheat seedlings. The results indicated that the peroxidase(POD) activity in wheat leaves after 7 d of exposure was one of the sensitive biomarkers of chlorimuron-ethyl in *** extractability of chlorimuron-ethyl by all the 3 solvents decreased with exposure time, and the rate of decrease of the PBS-M extraction between 1 and 7 d of exposure was substantially higher than those of the aqueous solution extractions. Chlorimuron-ethyl gradually changed from a water-soluble form into a soil organic matter(SOM)-bound form in the soil. The PBS extraction correlated best with the POD activity in the leaves after 7 d of exposure.

关键词： chemical extraction environmental risk organic pollutants organic solvent peroxidase activity phosphate buffer solution toxicity test

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Foliar application of zinc promotes cadmium absorption by increasing expression of cadmium transporter genes and activities of antioxidative enzymes in winter wheat

引用

Pedosphere 2023年第4期33卷 612-621页

作者： Shiyu QIN Yafang XU Hongen LIU Peng ZHAO College of Resources and Environment Henan Agricultural UniversityZhengzhou 450002(China) Key Laboratory of soil pollution and Remediation of Henan Province Zhengzhou 450002(China)

Cadmium(Cd)is a deleterious non-essential metal in *** elucidate the mechanisms by which zinc(Zn)application alleviates cadmium(Cd)toxicity in wheat,we characterized plant growth,antioxidant system,leaf cell ultrastructure,and Cd transporter gene expression in winter wheat under Cd exposure(50μmol L^(-1)Cd)with foliar Zn application in a hydroponic *** showed that Zn addition(Zn+Cd)or pretreatment(pre-Zn+Cd)at 2 g L^(-1)as Zn_(S)O_(4)·7H_(2)O significantly exacerbated Cd-induced growth inhibition and diminished root morphological parameters,root cell viability,and chlorophyll *** addition,the Cd content increased in roots and shoots in the Zn+Cd and pre-Zn+Cd treatments,but the Cd translocation factor decreased,when compared to the treatment without Zn *** Zn application,the Cd content increased in the root cell wall fraction but decreased in the soluble *** activities of antioxidative enzymes(superoxide dismutase,peroxidase,and catalase)and the contents of non-enzymatic antioxidants(malondialdehyde,ascorbic acid,and glutathione)significantly increased in the roots and shoots of wheat after Cd exposure,particularly in the Zn+Cd and pre-Zn+Cd *** expression analysis showed that five genes(TaHMA2,TRIAE5370,TCONS1113,TRIAE5770,TRIAE1060,and TCONS5200)participated in root absorption of Cd,whereas TCONS5200 and TRIAE5660 contributed to Cd transfer to *** application of Zn increased the number of chloroplasts,but the chloroplast structure was destroyed in the Zn+Cd *** results indicated that 2 g L^(-1)ZnSO4·7H2O increased the toxicity of 50μmol L^(-1)*** Cd uptake due to the upregulated expression of Cd transporter genes and increased reactive oxygen species accumulation may be the reasons why Zn application aggravated Cd toxicity.

关键词： antioxidative enzyme activity Cd stress gene expression leaf ultrastructure mesophyll cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Characteristics of dissolved organic matter in lakes with different eutrophic levels in southeastern Hubei Province,China

引用

Journal of Oceanology and Limnology 2021年第4期39卷 1256-1276页

作者： Weixiang REN Xiaodong WU Xuguang GE Guiying LIN Mengdie ZHOU Zijie LONG Xinhui YU Wei TIAN College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi 435002China Huangshi Key Laboratory of soil pollution and Control Huangshi 435002China

Dissolved organic matter(DOM)plays a crucial role in both the carbon cycle and geochemical cycles of other nutrient elements,which is of importance to the management and protection of the aquatic *** achieve a more comprehensive understanding the characteristics of DOM in the Changjiang(Yangtze)River basin,water samples from four natural lakes(Xiandao,Baoan,Daye,and Qingshan)in southeastern Hubei Province in China with different eutrophication levels were collected and *** optical characteristics were analyzed using ultraviolet-visible spectrophotometry and excitation-emission matrix spectroscopy coupled with parallel factor *** results show that:(1)two humic-like components(C1 and C2)and two protein-like substances(C3 and C4)of DOM were identified in all waterbodies;(2)C3 originated primarily from the degradation of microalgae and contributed substantially to humic-like components during transformation.C4 was widely present in the Changjiang River basin and its formation was related to microbial activity,rather than algal blooms or *** by the water mixing,the protein-like components were more likely to be transformed by microorganism,whereas humic-like components were more easily to be photobleached;(3)the concentration of DOM and the fluorescence intensity of humic-like components gradually increased with rising lake eutrophication *** respect to protein-like components,only C3 showed changes along the eutrophication gradients;(4)DOM showed a high affinity with permanganate index(COD Mn)and chlorophyll a(chl a)while the relationship was variable with *** study helps us systematically understand the DOM characteristics,microbial activities,and pollutant transformation in the Changjiang River basin and provides reference to the ecological restoration of aquatic environments.

关键词： Hubei eutrophic lake dissolved organic matter(DOM) excitation-emission spectra parallel factor analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Kinetics of antimony biogeochemical processes under pre-definite anaerobic and aerobic conditions in a paddy soil

引用

Journal of Environmental Sciences 2022年第3期34卷 269-280页

作者： Bingqing Xia Yang Yang Fangbai Li Tongxu Liu Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for soil pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 200049China

While the transformation of antimony(Sb) in paddy soil has been previously investigated, the biogeochemical processes of highly chemical active Sb in the soil remain poorly understood. In addition, there is a lack of quantitative understanding of Sb transformation in soil. Therefore, in this study, the kinetics of exogenous Sb in paddy soils were investigated under anaerobic and aerobic incubation conditions. The dissolved Sb(V) and the Sb(V) extracted by diffusive gradient technique decreased under anaerobic conditions and then increased under aerobic conditions. The redox reaction of Sb occurred, and Sb bioavailability significantly decreased after 55 days of incubation. The kinetics of Fe and the scanning transmission electron microscopy analysis revealed that the Fe oxides were reduced and became dispersed under anaerobic conditions, whereas they were oxidized and re-aggregated during the aerobic stage. In addition, the redox processes of sulfur and nitrogen were detected under both anaerobic and aerobic conditions. Based on these observations, a simplified kinetic model was established to distinguish the relative contributions of the transformation processes. The bioavailability of Sb was controlled by immobilization as a result of S reduction and by mobilization as a result of Fe reductive dissolution and S oxidation, rather than the p H. These processes coupled with the redox reaction of Sb jointly resulted in the complex behavior of Sb transformation under anaerobic and aerobic conditions. The model-based method and findings of this study provide a comprehensive understanding of the Sb transformation in a complex soil biogeochemical system under changing redox conditions.

关键词： Antimony Biogeochemical process Kinetics Paddy soil Anaerobic conditions Aerobic conditions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chromium transformation driven by iron redox cycling in basalt-derived paddy soil with high geological background values

引用

Journal of Environmental Sciences 2023年第3期125卷 470-479页

作者： Ke Zhang Yang Yang Wenting Chi Guojun Chen Yanhong Du Shiwen Hu Fangbai Li Tongxu Liu Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 510640China National-Regional Joint Engineering Research Center for soil pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China University of Chinese Academy of Sciences Beijing 100049China

The flooding and drainage of paddy fields has great effects on the transformation of heavy metals, however, the transformation of Cr in basalt-derived paddy soil with high geological background values was less recognized. The typical basalt-derived paddy soil was incubated under alternating redox conditions. The Cr fractions and the dynamics of Fe/N/S/C were examined. The HCl-extractable Cr increased under anaerobic condition and then decreased during aerobic stage. The UV-vis spectra of the supernatant showed that amounts of colloids were released under anaerobic condition, and then re-aggregated during aerobic phase. The scanning transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS) revealed that Fe oxides were reduced and became dispersed during anaerobic stage, whereas Fe(Ⅱ) was oxidized and recrystallized under aerobic condition. Based on these results, a kinetic model was established to further distinguish the relationship between the transformation of Cr and Fe. During anaerobic phase, the reduction of Fe(Ⅲ) oxides not only directly released the structurally bound Cr, but also enhanced the breakdown of soil aggregation and dissolution of organic matter causing indirect mobilization of Cr. During aerobic phase, the oxidation of Fe (Ⅱ) and further recrystallization of newly formed Fe(Ⅲ) oxides might induce the re-aggregation of soil colloids and further incorporation of Cr. In addition,the kinetic model of Cr and Fe transformation was further verified in the pot *** model-based findings demonstrated that the Cr transformation in the basalt-derived paddy soil with high geological background values was highly driven by redox sensitive iron cycling.

关键词： Chromium Paddy soil Iron oxides Redox High geological background

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Legacy of herbicides in water from Hailun City,Northeast China:Occurrence,source,and ecological risk assessment

引用

Journal of Environmental Sciences 2024年第11期145卷 50-63页

作者： Jun Ma Wenjie Ren Hongzhe Wang Jiayin Song Junfeng Jia Hong Chen Changyin Tan Ying Teng School of Geographic Sciences Hunan Normal UniversityChangsha 410081China Key Laboratory of soil Environment and pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China College of Materials and Chemistry Tongren UniversityTongren 554300China

Herbicides(HBCs)are extensively used in modern ***,their potential negative impacts on environmental media have emerged as a significant environmental *** this study,we employed positivematrix factorization(PMF)to identify the potential sources of ***,we utilized amulti-matrix ecological riskmodel to assess the risks associated with HBCs in both surface water and groundwater in the black soil region of Northeast *** findings revealed that the levels of15HBCs in surface water and groundwater ranged from585.84 to 6466.96 ng/L and 4.80 to 11,774.64 ng/L,*** PMF results indicated that surface runoff and erosion accounted for 50%of the total HBCs in water,serving as the primary *** tested HBCs exhibited acute risk values within acceptable *** risk index for the∑15HBCs was categorized as“moderate risk”in 31%of the surface waters and 13%of the ***,4%of the groundwater sampling sites reached the“high risk”*** chronic risk quotient of∑15HBCs in surface water and groundwater was 92%and 62%at the“high risk”level,***,noncarcinogenic HBCs contributed more significantly to the ecotoxicology of the aquatic system than carcinogenic *** study provides comprehensive information on the legacy of HBCs in water bodies and emphasizes the potential risks posed by HBCs to aquatic *** results obtained from this study could help relevant management authorities in developing and implementing effective regulations tomitigate the ecological and environmental risks associated with HBCs.

关键词： Herbicide Surface and groundwater Source apportionment Ecological risk assessment

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Submarine groundwater discharge and associated nutrient fluxes in the Greater Bay Area, China revealed by radium and stable isotopes

引用

Geoscience Frontiers 2021年第5期12卷 397-410页

作者： Qianqian Wang Xuejing Wang Kai Xiao Yan Zhang Manhua Luo Chunmiao Zheng Hailong Li State Environmental Protection Key Laboratory of Integrated Surface water-Groundwater pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhenGuangdong 518055China School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution ControlSouthern University of Science and TechnologyShenzhenGuangdong 518055China MOE Key Laboratory of Groundwater Circulation&Environment Evolution and School of water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China

The estuary-bay system is a common and complex coastal ***,quantifying submarine groundwater discharge(SGD)and associated nutrient fluxes in the complex coastal environment is challenging due to more dynamic and complicated riverine discharge,ocean processes and human *** this study,SGD and SFGD(submarine fresh groundwater discharge)fluxes were evaluated by combining stable and radium isotopes in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA),a typical estuary-bay *** first built a spatially distributed radium mass balance model to quantify SGD fluxes in coastal areas of GBA integrating the Pearl River Estuary(PRE),bays and *** then used the stable water isotope(d2 H and d18O)end-member mixing model to distinguish submarine fresh groundwater discharge(SFGD)from *** on the 228Ra mass balance,the estimated SGD fluxes in the PRE,adjacent bay,and shelf areas were(6.14±2.74)×10^(8) m^(3) d^(-1),(3.00±1.11)×10^(7) m^(3) d^(-1),and(5.00±5.64)×10^(8) m^(3) d^(-1),*** showed that the largest area-averaged SGD was in the PRE,followed by that in the adjacent shelf and the *** differences may be mainly influenced by ocean forces,urbanization and benthic topographies controlling the variability of groundwater ***,the three end-member mixing model of ^(228)Ra and salinity was developed to confirm the validity of the estimated SGD using the Ra mass balance *** the two models,groundwater endmember and water apparent age estimation were the main sources of uncertainty in *** estimated SFGD flux was(1.39±0.76)108 m^(3) d^(-1),which accounted for approximately 12%of the total *** stable and radium isotopes was a useful method to estimate groundwater ***,the estimated SGD associated dissolved inorganic nitrogen(DIN)flux was one order of magnitude higher than other DIN *** was considered to be a significant contributor to the DIN loading to the *** findings

关键词： Radium isotopes Stable isotopes Submarine fresh groundwater discharge Nutrients Coastal aquifers Pearl River estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Dependence of cumulative CO_(2) emission and microbial diversity on the wetting intensity in drying-rewetting cycles in agriculture soil on the Loess Plateau

引用

soil Ecology Letters 2023年第2期5卷 65-76页

作者： Panpan Jiao Lei Yang Xiaodong Nie Zhongwu Li Lin Liu Peng Zheng State Key Laboratory of soil Erosion and Dryland Farming on the Loess Plateau The Research Center of Soil and Water Conservation and Ecological EnvironmentChinese Academy of Sciences and Ministry of EducationYangling 712100China Institute of soil and water Conservation Chinese Academy of Sciences and Ministry of Water ResourcesYangling 712100China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of soil Environment and pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China College of Resources and Environmental Sciences Hunan Normal UniversityChangsha 410081China College of Geography and Environment Shandong Normal UniversityJinan 250014China

Altered drying-rewetting(DRW)procedures due to climate change may influence soil microbial properties and microbially-mediated carbon cycling in arid and semi-arid ***,the effects of DRW of different intensities on the microbial properties and respiration are not well ***,the responsive patterns of microbial communities and carbon mineralization in agriculture soil on the Chinese Loess Plateau to DRW treatments with different wetting intensities(5%-25% and 5%-36%)and frequency(1-cycle to 4-cycle)were *** moisture levels of 5%,25% and 36% were used as *** revealed that the reduction of bacterial diversity and richness were greater for 5%-36% than 5%-25% treatment,while diversity of fungi was similar for different wetting *** communities became clustered by wetting intensity rather than cycle number,however fungal community was unaffected by *** complexity of bacterial co-occurrence network increased because of higher nodes,edges,average degree,diameter and average cluster coefficient after 4-cycles,and the interaction was more complex after 1-cycle for *** caused a pulse-like increase of respiration rate,and the pulse amplitude was greater for DRW with high rewetting intensity and decreased with the increase of cycle *** cumulative CO_(2) emission for DRW treatments was lower than that for the continuous moisture *** net reduction of carbon release for 5%-36% treatment was 1.18 times higher than that for 5%-25% *** study provides experimental evidence of the positive potential of DRW processes for maintaining soil carbon stock in an agriculture system on the Loess Plateau.

关键词： Wetting intensity Drying-rewetting cycles Microbial communities Birch effect CO_(2)emission

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fate Processes of Chlorobenzenes in soil and Potential Remediation Strategies: A Review

引用

Pedosphere 2017年第3期27卷 407-420页

作者： Ferdi BRAHUSHI Fredrick Orori KENGARA SONG Yang JIANG Xin Jean Charles MUNCH WANG Fang Key Laboratory of soil Environment and pollution Remediation Institute of Soil Science Chinese Academy of Sciences Department of Agroenvironment and Ecology Agricultural University of Tirana Department of Chemistry Maseno University Center of Life and Food Sciences Technical University Munich

Chlorobenzenes （CBs） are a group of organic pollutants that pose a high environmental risk due to their toxicity, persistence and possible transfer in the food chain. Available data in literature show that CBs axe detected in different environmental compartments such as soil, water, air and sediment. The widespread presence of CBs in the environment is related to their former extensive use in agriculture and industry. Some CBs are ranked in the list of priority pollutants by the Stockholm Convention, and their reduction or elimination from the environment is therefore of high importance. Environmental risk assessment of CBs requires knowledge on the role and importance of the main environmental fate processes, especially in soil. Furthermore, development of remediation strategies for reduction or elimination of CBs from the environment is related to the enhancement of fate processes that increase their dissipation in various environmental compartments. The main objectives of the current review were to present up-to-date data on fate processes of CBs in the soil environment and to explore possible remediation strategies for soils contaminated with CBs. Dechlorination of highly-chlorinated benzenes is the main degradation pathway under anaerobic conditions, leading to the formation of lower-chlorinated benzenes. Biodegradation of lower-chlorinated benzenes is well documented, especially by strains of adapted or specialized microorganisms. Development of techniques that combine dechlorination of highly-chlorinated benzehes with biodegradation or biomineralization of lower-chlorinated benzenes can result in useful tools for remediation of soils contaminated with CBs. In addition, immobilization of CBs in soil by use of different amendments is a useful method for reducing the environmental risk of CBs.

关键词： biodegradation chlorinated benzenes environmental risk immobilization mineralization organic pollutant reductivedechlorination

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Relationship between types of urban forest and PM_(2.5) capture at three growth stages of leaves

引用

Journal of Environmental Sciences 2015年第1期27卷 33-41页

作者： Thithanhthao Nguyen Xinxiao Yu Zhenming Zhang Mengmeng Liu Xuhui Liu College of soil and water Conservation Beijing Forestry University Science and Technology Department College of Nature Conservation Beijing Forestry University

Particulate matter diameter ≤ 2.5 μm（PM2.5） causes direct harm to human health. Finding forms of urban forest systems that with the ability to reduce the amount of particulate matter in air effectively is the aim of this study. Five commonly cultivated kinds of urban forest types were studied in Beijing city at three stages of leaf growth. Results show that the urban forest system is capable of storing and capturing dust from the air. The types of shrubs and broadleaf trees that have the ability to capture PM2.5from the air are most effective when leaves have fully developed. In the leafless season, the conifer and mixed tree types are the most effective in removing dust from the air. For all kinds of forest types and stages of leaf growth, the PM2.5concentration is highest in the morning but lower in the afternoon and evening. Grassland cannot control particles suspended in the air,but can reduce dust pollution caused by dust from the ground blown by the wind back into the air.

关键词： Particulate matter PM2.5 Type of urban forest Growth stages of leaves

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：