中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
青海共和盆地土壤风蚀的137Cs法研究(Ⅱ)——137Cs背景值与风蚀速率测定

文献类型:期刊论文

作者张信宝
刊名中国沙漠
出版日期2003
卷号23期号:4页码:391-397
关键词土壤风蚀 137Cs背景值 137Cs风蚀模型 蚀积平衡 共和盆地
其他题名Application of Caesium-137 Technique on Wind Erosion in Gonghe Basin, Qinghai Province (Ⅱ)-~(137)Cs Reference Inventory and ~(137)Cs Model for Wind Erosion Estimation
合作状况国内
中文摘要通过对高寒草原背景值样点(RS7)的分析,将共和盆地的137Cs背景值含量确定为(2691.78±196 08)Bq·m-2,基本接近北半球137Cs背景值的平均水平,其137Cs剖面满足尖峰分布函数,与公认的理论分布(即负指数分布)相比,呈现出峰值下移和曲线趋平的现象,可能与近几十年来137Cs的稳定下渗有关。应用137Cs背景值剖面分布函数,建立了风蚀速率的137Cs估算模型,估算出四个样方的土壤风蚀速率,并由此转化为区域风蚀速率,计算出共和盆地区域土壤风蚀速率为12 556t·hm-2·a-1,通过蚀积平衡检验,其误差水平小于10%。并分析了风蚀物的输出途径及其所占比例。
英文摘要Analyzing results of the 137Cs distribution along soil profile suggest that the cold grassland that maintained the relatively perfect profile of original 137Cs fallout can be regarded as ideal sampling site of 137Cs reference. Therefore the value of 137Cs reference inventory of the Gonghe Basin is calculated to be (2691.78 ±196108) Bq·m^-2 at the site of RS7, which is close to the globe average of the Northern Hemisphere. The depth distribution of 137Cs activity fits the peak type remarkably, and comparing with the exponential type regarded as classical and theoretical one, it exhibites the descent of peak layer and smoothing of the 137Cs curve, which is possibly related to stable infiltration of 137Cs in recent decades. Therefore by means of the 137Cs model derived from the 137Cs reference distribution, the rate of wind erosion on the four sampling plots was estimated, and then transforming the point erosion estimates to the area, the rate of wind ero2 sion in the Gonghe Basin averaged 121556 t·hm^-2·a^-1, which is in according with the erosion-deposition equilibrium with a relatively small error less than 10%.
资助信息国家自然科学基金(40001001); 国家重大基础研究规划项目(G2000048702); "十五"国家科技攻关项目"沙区农田、草地土壤风蚀防治技术研究"课题(2002BA517A10)
语种中文
公开日期2011-05-11
源URL[http://ir.imde.ac.cn/handle/131551/3087]  
专题成都山地灾害与环境研究所_成都山地所知识仓储(2009年以前)
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
推荐引用方式
GB/T 7714
张信宝. 青海共和盆地土壤风蚀的137Cs法研究(Ⅱ)——137Cs背景值与风蚀速率测定[J]. 中国沙漠,2003,23(4):391-397.
APA 张信宝.(2003).青海共和盆地土壤风蚀的137Cs法研究(Ⅱ)——137Cs背景值与风蚀速率测定.中国沙漠,23(4),391-397.
MLA 张信宝."青海共和盆地土壤风蚀的137Cs法研究(Ⅱ)——137Cs背景值与风蚀速率测定".中国沙漠 23.4(2003):391-397.

入库方式: OAI收割

来源:成都山地灾害与环境研究所

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