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农耕地土壤~(210)Pb_(ex)含量对侵蚀速率变化的响应模型
引用本文:张信宝,张云奇,贺秀斌,龙翼,李豪.农耕地土壤~(210)Pb_(ex)含量对侵蚀速率变化的响应模型[J].土壤学报,2010,47(4):593-597.
作者姓名:张信宝  张云奇  贺秀斌  龙翼  李豪
作者单位:1. 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,成都,610041;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,贵阳,550002
2. 临沂师范学院环境与旅游学院,山东临沂,276005
3. 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,成都,610041
4. 四川大学水力学与山区河流开发保护国家重点实验室,成都,610065
基金项目:国家自然科学基金项目(40971169)、中国科学院西部行动计划项目(KZCX2-XB2-07)和国家科技支撑计划课题(2008BAD98B01)资助
摘    要: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。

关 键 词:农耕地  210Pbex含量  侵蚀速率  时间响应模型
收稿时间:1/1/1900 12:00:00 AM
修稿时间:2010/1/22 0:00:00

Response of 210Pbex inventory to changes in erosion rates in soil of cultivated land
Zhangxinbao,Zhangyunqi,He Xiubin,Longyi and Li hao.Response of 210Pbex inventory to changes in erosion rates in soil of cultivated land[J].Acta Pedologica Sinica,2010,47(4):593-597.
Authors:Zhangxinbao  Zhangyunqi  He Xiubin  Longyi and Li hao
Affiliation:4 ( 1 Key Laboratory of Mountain Environment Evolvement and Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China) ( 2 State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China) ( 3 College of Environment and Tourism,Linyi Normal University,Linyi,Shandong 276005,China) ( 4 State Key Laboratory of Hydraulics and Mountain River Engineering,Chengdu 610065,China)
Abstract:Based 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 137Cs method is the mean soil erosion rate of the past 40 a or 50 a and with the 210Pbex 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, 210Pbex 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.
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