检索结果-南通市图书馆

Assessment of heavy metal enrichment and its human impact in lacustrine sediments from four lakes in the mid-low reaches of the Yangtze River, China

引用

Journal of Environmental Sciences 2013年第7期25卷 1300-1309页

作者： haijian bing Yanhong Wu Enfeng Liu Xiangdong Yang Alpine Ecosystem Observation and Experiment Station of Mt. Gongga The Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences

Sediments from four lakes in the mid-low reaches of the Yangtze River, Taibai Lake, Longgan Lake, Chaohu Lake and Xijiu Lake, were chosen to evaluate their enrichment state and history. The state of heavy metal enrichment was at a low level in the sediment of Taibai Lake and Longgan Lake. The enrichment state of Co, Cr and Ni was also low in the sediment of Chaohu Lake and Xijiu Lake, while Cu, Pb and Zn enrichment reached a higher level. Mass accumulation fluxes were calculated to quantitatively evaluate the anthropogenic contribution to heavy metals in the sediment. The anthropogenic accumulation fluxes were lower in the sediment of Taibai Lake and Longgan Lake compared with the other two lakes, where heavy metals, especially Cu, Pb and Zn, were mainly from anthropogenic sources. Heavy metal accumulation did not vary greatly in the sediment of Taibai Lake and Longgan Lake, while that in Chaohu Lake and Xijiu Lake increased since the 1950s and substantially increased since the 1980s, although a decrease occurred since 2000 AD in Xijiu Lake. Heavy metal enrichment was strongly related to human activities in the catchment. The development of urbanization and industrialization was much more rapid in the catchments of Chaohu Lake and Xijiu Lake than of the other two lakes, and thus large amounts of anthropogenically sourced heavy metals were discharged into the lakes, which resulted in a higher contamination risk. However, human activities in the Longgan Lake and Taibai Lake catchments mainly involved agriculture, which contributed a relatively small portion of heavy metals to the lakes.

关键词： heavy metals human activity accumulation flux lake sediment

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

Historical trends of heavy metal contamination and their sources in lacustrine sediment from Xijiu Lake,Taihu Lake Catchment,China

引用

Journal of Environmental Sciences 2011年第10期23卷 1671-1678页

作者： haijian bing Yanhong Wu Zhaobin Sun Shuchun Yao Nanjing Institute of Geography and Limnology Chinese Academy of Sciences State Key Laboratory of Lake Science and Environment Nanjing 210008 China Graduate University of the Chinese Academy of Science Beijing 100049 China Institute of Mountain Hazard and Environment Chinese Academy of Sciences Chengdu 610041 China

Concentrations of Cd, Cr, Cu, Pb, Zn and Hg in Xijiu Lake sediment from the Taihu Lake catchment, China, were analyzed. Their contamination state was investigated based on the geoaccumulation index and enrichment factors. Statistical analysis was used to differentiate the anthropogenic versus natural sources of heavy metals （HMs）, and the anthropogenic accumulation fluxes were calculated to quantify anthropogenic contribution to HMs. The results indicated that the lake sediment had been heavily contaminated by Cd, enrichment of Zn and Hg was at a relatively high level, while that of Cu and Pb was in the lower-to-moderate level and Cr was in the low enrichment level. Sources of Cr in the sediment were mainly from natural inputs, while other metals, especially Cd, were predominantly derived from anthropogenic sources. In the past century, anthropogenic accumulation fluxes of Pb, Zn and Hg increased by 0.147.3 mg/（cm2-yr）, 2.4-398.1 mg/（***）, and 3.7-110.3 ng/（***）, respectively, accounting for most inputs of HMs entering the sediment. The contamination state of HMs varied with industrial development of the catchment, which demonstrated that contamination started in the early 20th century, reached the maximal level between the mid-1970s and mid-1990s, and decreased a little after the implementation of constraints on high contamination industries, although the contamination of some HMs, such as Cd, Zn and Hg, is still at high levels.

关键词： accumulation fluxes contamination heavy metals human activity sediment Xijiu Lake

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

Incubation experiment demonstrates effects of carbon and nitrogen on microbial phosphate-solubilizing function

引用

Science China(Life Sciences) 2017年第4期60卷 436-438页

作者： Hongyang Sun Yanhong Wu Jun Zhou haijian bing Key Laboratory of Mountain Surface Process and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences

Dear Editor,Phosphorus（P）ultimately comes from rock weathering in natural ecosystems（Porder et al.,2007）,and thus solubilization of rock phosphate plays a crucial ecological role in P supply for the ***,microbial solubilization of rock phosphate is a vital process for the replenishment of available P in alpine ecosystems where the weathering degree of soil is low.

关键词： microbial rock vital comes alpine phosphorus ultimately weathering dissolved phospholipid

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

Geochronology of recent lake sediments from Longgan Lake,middle reach of the Yangtze River,influenced by disturbance of human activities

引用

Science China Earth Sciences 2010年第8期53卷 1188-1194页

作者： WU YanHong LIU EnFeng bing haijian YANG XiangDong XUE Bin XIA WeiLan State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China Graduate University of Chinese Academy of Sciences Beijing 100049China

The impacts of human activities in Longgan Lake region on the distribution of 210Pb in lake sediment made it difficult to establish geochronological sequence. However, environmental proxies recorded these human activities and could be used as time marker to check 210Pb dating results. Based on the analysis of 210Pbexc distribution in cores LS-1 and LGL-1, and in combination with the human activities records in grain-size and element concentration, the sedimentation rates in the upper layers of these two cores were determined to be 0.19 and 0.23 cm/a respectively. The MAR (mass accumulation rates) of these two cores demonstrated that natural condition, such as precipitation and runoffs, led to the variation of MAR before human disturbance, and human activities controlled the sedimentary processes afterwards, which obviously reduced the particles influx into the lakes. During 1940s when human activity had not changed the water system within the catchment, 210Pb activity was abnormally strong in lakes along middle to lower reaches of the Yangtze River, which might be attributed to less precipitation and can be used as a time marker for geochronological research.

关键词： 210Pb geochronology environmental index human activity Longgan Lake

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

Air-drying changes the distribution of Hedley phosphorus pools in forest soils

引用

Pedosphere 2020年第2期30卷 272-284页

作者： Jipeng WANG Yanhong WU Jun ZHOU haijian bing Hongyang SUN Ji LUO Shengyan PU Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China

Hedley labile phosphorus(P)pools in soil tend to be several times larger than annual forest requirements,even in highly weathered soils characterized by P *** discrepancy between plant and soil P status could be partly attributable to the frequently adopted air-drying pretreatment that tends to increase soil P *** this study,the effects of air-drying on the distribution of Hedley P fractions were examined using soils collected under 4 forest types at Gongga Mountain,southwestern *** results showed that the microbial biomass P(Pmic)in the organic horizon decreased markedly after *** concentrations of Hedley labile P in the air-dried samples were 31%–73%more than those in the field-moist ***,the air-drying-induced increments of Hedley labile P pools in the surface soil horizons were 0.8–3.8 times the annual plant P *** organic horizon was more susceptible to the air-drying-induced increases in Hedley labile P than the mineral horizon,probably because of the stronger release of Pmicand disruption of soil organic *** quality of P,indexed by the ratio of Hedley labile P to slowly cycling P,shifted in favor of the Hedley labile fractions after air-drying,further revealing that air-drying changed the distribution of Hedley P pools in forest *** indicated that the effects of air-drying could not be ignored when interpreting the discrepancy between the P status of plants and the Hedley labile P pools in forest *** more efficiently evaluate the P status in forest soils via the Hedley fractionation procedure,the use of field-moist soils is recommended.

关键词： Hedley fractionation labile phosphorus microbial biomass phosphorus phosphorous limitation slowly cycling phosphorus soil pretreatment

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

Trace metal contamination in soils from mountain regions across China:spatial distribution,sources,and potential drivers

引用

Soil Ecology Letters 2021年第3期3卷 189-206页

作者： haijian bing Shaojun Qiu Xin Tian Jun Li He Zhu Yanhong Wu Gan Zhang Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Trace metal contamination in soils is a threat with an uncertain limit to maintain planet safety,and the issue of trace metal contamination in mountain soils is still of low *** this study,we assessed the contamination of six trace metals(Cd,Cr,Cu,Ni,Pb,and Zn)in mountain soils across China and deciphered the potential drivers of their spatial *** results showed that concentrations of Cd and Pb decreased significantly with soil depth,and their concentrations were markedly higher in northwest,south,and southwest China than *** the metals,Cd was the priority for control with moderate to heavy contamination,followed by Pb,whereas the other metals did not show evident *** altitudinal pattern and isotopic tracing revealed that the significant enrichment and marked contamination of Cd and Pb in surface soils were primarily attributed to deposition through long-range transboundary atmospheric transport and *** mining,nonferrous smelting,and coal and fuel combustion were identified as primary anthropogenic sources of the Cd and *** organic matter content,pH,and soil forming processes directly determined the accumulation of trace metals in the soils,and orographic effects,including local climate,vegetation composition,and canopy filtering,regulated the spatial distribution of the *** study highlights the significance of soil Cd contamination in mountains,which are considered of low concern,and suggests that long-term monitoring of trace metal contamination is necessary to improve biogeochemical models that evaluate the responses of the mountain critical zone to future human-and climate-induced environmental changes.

关键词： Trace metals Soil contamination Source identification Atmospheric deposition Driving factors Mountain regions

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

Soil phosphorus bioavailability assessed by XANES and Hedley sequential fractionation technique in a glacier foreland chronosequence in Gongga Mountain, Southwestern China

引用

Science China Earth Sciences 2014年第9期57卷 1860-1868页

作者： WU YanHong Jrg PRIETZEL ZHOU Jun bing haijian LUO Ji YU Dong SUN ShouQin LIANG JianHong SUN HongYang Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences Technische Universitt München Lehrstuhl für BodenkundeD-85354 Freising Germany University of Chinese Academy of Sciences

The primary productivity of terrestrial ecosystems is influenced by soil phosphorus bioavailability, which depends largely on chemical fractions of phosphorus. The sequential fractionation technique developed by Hedley et al. or its subsequent modification is a well-known method to determine soil phosphorus forms. Hedley sequential fractionation technique separates the phosphorus into fractions based on their different chemical solubilities in extractants with certain chemical properties. Recently, synchrotron-based X-ray absorption near edge structure(XANES) spectroscopy has been employed to measure soil phosphorus species directly and non-invasively. The XANES method provides information concerning local structure and chemical information of target elements at a molecular level. Thus, it can distinguish phosphorus fractions bound by metal oxides or hydroxides(such as Fe, Al, and Ca). In this present work, the phosphorus speciation of topsoil along a glacial foreland chronosequence in Gongga Mountain is determined using these two methods. The changes in soil phosphorus bioavailability along the 120-year-old chronosequence are assessed based on comparisons of the results obtained by these two methods. The results indicate that Hedley sequential fractionation technique shows a greater ability to determine soil bioavailable phosphorus(Resin-P and NaCHO3-P), while XANES is effective in distinguishing phosphorus bound by metal compounds. In the chronosequence, Ca- and Al-bound phosphorus were derived mainly from primary minerals, whose phosphorus contents decreased within 120 years of moraine weathering and soil development. The content of soil bioavailable phosphorus increased rapidly after 30 years since deglaciation. The increasing phosphorus bioavailability promoted the colonizing and primary succession vegetation.

关键词： soil phosphorus forms Hedley sequential fractionation technique XANES Hailuogou

来源：

维普期刊数据库

同方期刊数据库

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

山地生态地球化学——定义、进展及展望

引用

地质论评 2012年第1期58卷 106-115页

作者：吴艳宏邴海健中国科学院-水利部成都山地灾害与环境研究所贡嘎山高山生态系统观测试验站中国科学院南京地理与湖泊研究所湖泊科学与环境国家重点实验室中国科学院研究生院

生态地球化学是生态学和地球化学相结合的学科,研究自然界中化学、物理、地质和生物过程,以及这些过程之间的相互作用及其对生态系统发生、发展所产生的影响,具体而言生态地球化学通过化学物质在生态系统中的分布、分配、迁移、转化规... 详细信息

生态地球化学是生态学和地球化学相结合的学科,研究自然界中化学、物理、地质和生物过程,以及这些过程之间的相互作用及其对生态系统发生、发展所产生的影响,具体而言生态地球化学通过化学物质在生态系统中的分布、分配、迁移、转化规律研究,评价生态系统状态及发展方向。生态地球化学虽然形成较晚,西方科学家甚至很少用"生态地球化学"这一名词,但国内外都已取得了长足进展,形成了以生态地球化学填图为基础,生态安全和健康评价为目的的多个独立生态系统的生态地球化学研究方向,如城市生态地球化学、湿地生态地球化学等。山地是陆地最主要的地貌单元,具有独特的生态系统特性,国内外山地生态地球化学研究尚未系统开展,但在山地元素地球化学、生物地球化学和生态地球化学评价等方面均已有相当显著的成果,今后山地生态地球化学研究在加强理论研究的同时,要注重建立完善的方法体系、研究体系和生态效应评价体系,为山地生态地球化学预警和生态保护、恢复提供依据。

关键词：生态地球化学生物地球化学化学物质循环生态系统山地

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

三峡库区丰都-忠县段消落带不同高程土壤镉及其形态的分布特征

引用

湖泊科学 2019年第6期31卷 1601-1611页

作者：钟志淋邴海健吴艳宏祝贺王晓晓周俊中国科学院、水利部成都山地灾害与环境研究所山地表生过程与生态调控重点实验室成都610041 中国科学院大学北京100049 西华师范大学国土资源学院南充637000

镉(Cd)是目前三峡库区消落带主要的污染物之一,其迁移和形态转化直接威胁水环境安全.选择库区丰都-忠县段消落带,按照高程差异分别于不同土地利用类型(农田、林地、果园和村庄)下采集土壤样品,利用化学连续提取法测定Cd的形态组成,探讨... 详细信息

镉(Cd)是目前三峡库区消落带主要的污染物之一,其迁移和形态转化直接威胁水环境安全.选择库区丰都-忠县段消落带,按照高程差异分别于不同土地利用类型(农田、林地、果园和村庄)下采集土壤样品,利用化学连续提取法测定Cd的形态组成,探讨影响消落带土壤中Cd及其形态空间分布的关键因素.结果表明,消落带土壤中Cd的平均含量为0.65 mg/kg,可交换态及碳酸盐结合态是土壤中Cd的主要形态,占比达到41.21%,残渣态和铁锰氧化物结合态次之,有机物及硫化物结合态占比最低.不同土地利用类型下消落带土壤Cd的含量整体上不存在显著性差异,表明当地人类活动对土壤Cd的直接贡献较弱.消落带土壤Cd及其形态的含量与高程呈显著负相关,且在160~165 m区域发生明显转变,水位变化导致的泥沙沉积可能是控制消落带Cd空间分布的主要因素.此外,土壤理化性质,尤其是细颗粒泥沙对Cd及其形态分布具有明显影响,将来需重点关注泥沙理化属性对Cd迁移及形态转化的影响.

关键词：重金属形态组成土地利用类型水位变化三峡水库消落带

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

小冰期结束以来贡嘎山海螺沟冰川退缩区土壤化学风化与发育过程

引用

第四纪研究 2019年第5期39卷 1191-1202页

作者：王小芳邴海健吴艳宏祝贺周俊中国科学院、水利部成都山地灾害与环境研究所中国科学院山地表生过程与生态调控重点实验室四川成都610041 中国科学院大学北京100049

选择海螺沟冰川退缩区,对冰川退缩年龄分别为0年、30年、40年、52年、80年、120年的样点按土壤发生层分层采集样品,通过分析样品的化学风化速率及理化性质变化,探讨小冰期结束以来土壤发育过程及影响因素,并评估不同阶段土壤质量。结果... 详细信息

选择海螺沟冰川退缩区,对冰川退缩年龄分别为0年、30年、40年、52年、80年、120年的样点按土壤发生层分层采集样品,通过分析样品的化学风化速率及理化性质变化,探讨小冰期结束以来土壤发育过程及影响因素,并评估不同阶段土壤质量。结果表明,退缩区前40年样点中主要以碳酸盐风化为主,80年后硅酸盐风化作用增强。土壤长期风化速率随土壤年龄呈现升高-降低-升高的趋势,52年样点长期风化速率最低,为48.06cmol/(m^2·a),矿物组成和气候是影响土壤风化速率的重要原因。土壤的粒度组成以砂粒为主,多数样点占比约为80%~90%。随着土壤年龄增加,容重值和pH减小,pH从8.54减小到5左右;土层厚度、土壤有机质(SOC)及总氮(TN)含量增加,这些土壤理化指标的快速变化表明冰川退缩区土壤发育迅速。适宜的温度、充足的降水以及快速的植被演替可能是退缩区土壤快速发育的原因。模糊数学法计算土壤质量的结果显示,除了0年样点,其余样点土壤质量指数(SQI)均大于0.4,说明退缩区土壤质量状况整体属于中等水平,土壤肥力状况较好。研究结果有助于揭示土壤矿物风化过程和土壤发育的影响因素,理解土壤发育机制。

关键词：土壤发育土壤矿物风化土壤质量冰川退缩区贡嘎山

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：