土地利用/覆盖变化对地表蚀积过程的影响——来自^(137)Cs示踪的证据  

Influence of Land Use/Cover Change on Soil Surface Erosion/Deposition Process: Evidence from ^(137)Cs as A Tracer

作　　者：潘星慧[1] 张春来[1] 王升堂[2] 杨硕[1] 常春平[3] 邱玉珺[4] 

机构地区：[1]北京师范大学防沙治沙教育部工程研究中心/北京师范大学中国沙漠研究中心,北京100875 [2]皖西学院城市建设与环境系,安徽六安237012 [3]河北师范大学资源与环境科学学院,河北石家庄050016 [4]南京信息工程大学遥感学院,江苏南京210044

出　　处：《中国沙漠》2007年第6期994-999,共6页Journal of Desert Research

基　　金：国家自然科学基金项目(10532030;40301025;40601011)资助

摘　　要：土地利用/覆盖变化不仅影响地表137Cs总量的再分配,而且显著影响土壤137Cs剖面分布。坝上地区各类土地利用/覆盖条件下137Cs总量的再分配,显示该区总体处于风蚀环境,其中农田和撂荒地是风蚀最严重的土地利用类型;137Cs剖面分布则指示了土地利用/覆盖变化过程中的土壤风蚀/堆积过程的转换,蚀积过程的转换证实了风蚀重灾区退耕还林还草,特别是退耕还草,对控制土壤风蚀、改善生态环境的重要意义。分析还认为,利用137Cs示踪方法计算土壤风蚀/堆积速率时,应格外注意样地的土地利用/覆盖变化过程。　Land use/cover changes affect both redistribution of ^137Cs inventory and ^137Cs depth distribution in soil profile.Redistribution of ^137Cs inventory of several main types of land use/cover in Bashang region of Hebei province indicated that the region was in a wind erosion environment,where current agricultural land and deserted arable land are land use types suffering from the most serious wind erosion.^137Cs depth distribution denoted the conversion of soil erosion/deposition by wind in the process of land use/cover change,which proved the significance of vegetation restoration by afforesting or planting grass on the current agricultural land in stead of further cultivation for wind erosion control and eco-environmental improvement.The results suggested that the process of land use/cover change should be fully considered in estimating soil erosion/deposition rates using ^137Cs as a tracer.

关 键 词：土地利用/覆盖变化 ^137Cs总量 ^137Cs剖面分布 地表蚀积过程 

分 类 号：S157.1[农业科学—土壤学]