文档介绍：文章编号:1008-181X(2001)04-0297-04
陕北黄土高原陡坡耕地土壤侵蚀变异的空间格局
陈世宝1,韦东普1,夏侯国风1,李勇1, 2,何忠俊1
(1:中国农科院原子能利用研究所,北京100094; 2:中国科学院成都山地灾害与环境研究所,四川成都 610064)
摘要:利用环境放射性核素137-Cs技术定量评价陕北黄土高原典型山坡地顺坡断面(240 m)土壤重新分布的空间变化及其影响因素。结果表明,黄土高原坡地土壤侵蚀率存在明显的空间格局,即山坡中、上部是土壤侵蚀最为严重的地带, t/(hm2×a)以上;山顶和坡脚侵蚀速率较小, t/(hm2×a) t/(hm2×a),而坡下部土壤侵蚀速率居中, t/(hm2×a)。坡度变化是影响该地区土壤侵蚀速率空间变化的主导因子。本研究结果对黄土高原坡地土壤侵蚀的预测预报和准确防治土壤流失具有重要价值。
关键词:坡耕地;土壤侵蚀;137-Cs;空间格局;黄土高原
中图分类号:S157 文献标识码:A
Spatial patterns in soil erosion on the steep cultivated hillslope
in the Chinese Loess Plateau
CHEN Shi-bao1, WEI Dong-pu1, XIAHOU Guo-feng1, LI Yong1, 2, HE Zhongjun1
( 1: Institute for application of atomic energy, CAAS, Beijing 100094;
2 : Center of Mountain Environment Research, Institute of Mountain Hazards and Environment CAS, Chengdu 610064)
Abstract: Cultivating steep hillslope is one of the important factors that accelerating the soil erosion in Loess Plateau. However, little research has been conducted on quantitative assessment of spatial variability of soil erosion at different landscape scale of hillslope in Loess Plateau. This paper mainly studied the spatial redistribution and the effective factors of the soil erosion in a down hillslope with a length of 240 m in Loess Plateau by caesuim-137 technique. The result indicated there are evident spatial patterns of soil loss and g