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中国沙漠 ›› 2007, Vol. 27 ›› Issue (6): 994-999.

• 生物土壤与生态 • 上一篇    下一篇

土地利用/覆盖变化对地表蚀积过程的影响——来自137Cs示踪的证据

潘星慧; 张春来; 王升堂; 杨 硕; 常春平; 邱玉珺   

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-11-20 发布日期:2007-11-20

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

PAN Xing-hui; ZHANG Chun-lai; WANG Sheng-tang; YANG Shuo; CHANG Chun-ping; QIU Yu-jun   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-20 Published:2007-11-20

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。

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

Abstract: 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.

Key words: land use/cover change, 137Cs inventory, 137Cs depth distribution, process of soil erosion/deposition