IMHE OpenIR  > 山地表生过程与生态调控重点实验室
农耕地土壤210Pbex含量对侵蚀速率变化的响应模型
Alternative TitleRESPONSE OF 210Pbex INVENTORY TO CHANGES IN EROSION RATES IN SOIL OF CULTIVATED LAND
张信宝1,2; 张云奇3; 贺秀斌1; 龙翼1; 李豪4
2010
Source Publication土壤学报
ISSN0564-3929
Volume47Issue:3Pages:593-597
SubtypeArticle
Contribution Rank1
Abstract论文在分析了农耕地土壤侵蚀速率改变后土壤中210Pbex含量变化的基础上,检讨了现行的计算农耕地土壤侵蚀速率210Pbex法存在的问题误区.根据质量平衡原理建立了农耕地土壤210Pbex含量对侵蚀速率变化的响应模型,证明长期以来普遍认为的"210Pbex法测定值为100a或200a以来的较长期的平均土壤侵蚀速率"的看法是不正确的.并用模型模拟计算了侵蚀速率变化后农耕地210Pbex含量的响应过程,结果表明农耕地土壤侵蚀速率发生变化后,土壤的210Pbex面积活度迅即响应,随着时间的增加呈指数变化.侵蚀速率增大的,土壤中210Pbex面积活度降低;减小的,210Pbex面积活度增加.210Pbex可以替代137Cs用于农耕地土壤侵蚀速率的测定.210Pbex不但可以测定持续耕种100a以上农耕地的侵蚀速率,也可以用于调查近期土地利用变化的土壤侵蚀响应
Other AbstractBased on analysis of the variation of 210Pbex inventory in soil of cultivated land in response to changes in soil erosion rate,mistakes in calculation of soil erosion rate of cultivated land using the 210Pbex method are discussed. A model is established to fit response of 210Pbex inventory to variation of soil erosion rate in soil of cultivated land,based on the principle of mass balance,demonstrating that the long-commonly-held assumption that what is determined with the 137 Cs method is the mean soil erosion rate of the past 40 a or 50 a and with the 210 Pbex method the mean of a longer past of 100 a or 200 a is incorrect. The model is used to fit response of 210Pbex inventory to the variation of soil erosion rate from 0. 06 cm a -1 to 0. 6 cm a -1 and from 0. 6 cm a -1 to 0. 06 cm a -1. The results indicate that 210Pbex inventory responds quickly,which rises or reduce exponentially with time,but negatively with soil erosion rate. Consequently,210 Pbex can replace 137Cs in determining soil erosion rate in cultivated land not only 100 years old,but also just a few years old due to change in land use
Keyword农耕地 210Pbex含量 侵蚀速率 时间响应模型
Indexed ByCSCD
Language中文
CSCD IDCSCD:4113036
Citation statistics
Cited Times:6[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25594
Collection山地表生过程与生态调控重点实验室
Corresponding Author张信宝
Affiliation1.中国科学院成都山地灾害与环境研究所山地环境演变与调控重点实验室;
2.中国科学院地球化学研究所环境地球化学国家重点实验室;
3.临沂师范学院环境与旅游学院;
4.四川大学水力学与山区河流开发保护国家重点实验室
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
张信宝,张云奇,贺秀斌,等. 农耕地土壤210Pbex含量对侵蚀速率变化的响应模型[J]. 土壤学报,2010,47(3):593-597.
APA 张信宝,张云奇,贺秀斌,龙翼,&李豪.(2010).农耕地土壤210Pbex含量对侵蚀速率变化的响应模型.土壤学报,47(3),593-597.
MLA 张信宝,et al."农耕地土壤210Pbex含量对侵蚀速率变化的响应模型".土壤学报 47.3(2010):593-597.
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