检索结果-南通市图书馆

^(13.)Cs tracing of lacustrine sediments in the Dalian Lake,Qinghai Province,China

Chinese Science Bulletin 2001年第S1期46卷 83-87页

作者： van ping, dong guangrong & dong zhibaochina certer of desert research at beijing normal university, beijing100875, China:{3. {3. of environmental change and natural disaster, the ministry of education of China, beijing normal university, beijing 100875, China Cold and Arid Regions environmental and Engineering research Institute, Chinese Academy of Sciences, Lanzhou 73.000, China China certer of desert research at{3. Beijing China key laboratory of environmental {3. and {3. disaster The Ministry of Education of China Beijing Normal University Beijing China Cold and Arid Regions environmental and Engineering research Institute Chinese Academy of Sciences Lanzhou China

Based upon the analysis of Cs and grain-size parameters, the total amounts of 13.Cs deposition by wind and water in the Dalian Lake of Gonghe Basin, Qinghai Province are defined. The vertical profile of 13.Cs in the lacustrine sediments exhibits three 13.Cs activity maxima and one minimum. The major maximum corresponds to the global I3.Cs fallout in 1963. the two secondary maxima correspond to the leakage of the Chernobyl reactor in 1986 and complete desiccation of the lake in 1994, respectively. The minimum corresponds to aeolian deposition caused by extensive reclamation in the late 1980s and early 1990s. The 13.Cs data set was used to evaluate average sedimentation rate of the Dalian Lake since 1963. The deposition was stable in 1963.1986 and 1994-1998, and it was rapid during 1986?994. This preliminary study reveals that l3.Cs has the same potential to trace environmental changes introduce by human interference in arid/semiarid regions as in humid regions.

关键词： 13.Cs technique Dalian Lake sedimentation rate.

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

Preliminary results of the study on wind erosion in the Qinghai-Tibetan Plateau using 13.Cs technique

引用

Chinese Science Bulletin 2000年第11期45卷 1019-1025页

作者： YAN ping, dong guangrong, ZHANG Xinbao & ZHANG Yiyun1. {3. {3. of environmental change and natural disaster, the ministry of education of China, beijing normal university, beijing 100875, China 2. Institute of {13. research, Chinese Academy of Sciences, Lanzhou 73.000, China 3. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China 4. Department of Physics, Sichuan Union university, Chengdu 610041, China key laboratory of environmental {3. and {3. disaster the Ministry of Education of China Beijing Normal University Beijing China Institute of desert research Chinese Academy of Sciences Lanzhou China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China Department of Physics Sichuan Union University Chengdu China

The worldwide fallout of caesium-13. (13.Cs) associated with the nuclear weapon tests during the 1950s and 1960s has provided a valuable man-made tracer for studies of soil erosion and sediment delivery. But relatively few researchers have used it to estimate wind erosion. In this note, the 13.Cs technique is introduced into the studies of wind erosion and its modern processes inthe Qinghai-Tibetan Plateau. Two 13.Cs reference inventories of 982.11 and 2 3.6.04 Bq · m-2 wereestablished preminarily, distributed in the south and middle-north parts of the studied arearespectively. By analyzing the patterns of 13.Cs depth profiles from sampling sites, the aeolianprocesses of erosion and deposition in nearly 40 years have been revealed, i.e. the shrub coppicedunes (S1) and semi-fixed dunefields (S3. experienced the alternation of erosion and deposition,while the grasslands (S4, S6 and S7) and dry farmlands (S5) suffered erosion only. By using 13.Csmodel, the average wind erosion rates for shrub coppice

关键词： 13.Cs technique Qinghai-Tibetan Plateau wind erosion.

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

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

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：