水土保持学报2013，Vol.27Issue(4)：83-87,185,6.
近20年水蚀风蚀交错区小流域侵蚀及坡—沟产沙演变的粒径对比分析
Trend of Erosion and It's Rate of Slope-gully in Small Watershed of Water-wind Erosion Crisscross Region over Last 20 years on the Loess Plateau,China
摘要
Abstract
The investigations had been taken to map the outcrop soil stratums distribution in 1992.Surface soil samples were collected on all of outcrop soil stratums and the sediment was collected in the warping dam land in 1992.In 2010,the same field work was taken.Laboratory analyses included basic soil/sediment physical properties,all by standard methods.The sediment resource was identified with equivalent soilparticle-size model.The model results indicated that,from 1992 to 2010,under Grain for Green project,the erosion modulus of this watershed reduced from 150 t/(hm2 · a) to 31.01 t/(hm2 · a),the reducing rate was up to 80％.The erosion modulus of old loess(L2),new loess(L1) and sand(S) decreased up to 80％.The erosion modulus of slope and gully reduced from 78.70 t/(hm2 · a) and 298.25 t/(hm2 · a) in 1992 to 21.23 t/(hm2 · a) and 50.74 t/(hm2 · a) in 2010,and the ratio of slope erosion and gully erosion turned from 3.5 ∶ 6.5 to 4.6 ∶ 5.4.Corresponding to the regularly recovering vegetation,this ratio would keep an increasing trend.These significant changes supported the positive ecological benefits of grain for Green project in the water-wind erosion crisscross region.关键词
侵蚀量/坡—沟侵蚀比例/粒径对比分析/产沙地层/小流域/水蚀风蚀交错区Key words
erosion amount/ relationship of slope and gully erosion/ equivalent soil-particle-size model/outcrop soil stratums/ small watershed/ water-wind erosion crisscross region分类
农业科技引用本文复制引用
马瞳宇,李谭宝,张平仓,马芹,雷泳南,孙艳萍,徐金鹏,张晓萍..近20年水蚀风蚀交错区小流域侵蚀及坡—沟产沙演变的粒径对比分析[J].水土保持学报,2013,27(4):83-87,185,6.基金项目
国家自然科学基金项目(41101265,41230852) （41101265,41230852）
中国科学院知识创新项目(KZCX2-XB3-13,KZZD-EW-04-03-03) （KZCX2-XB3-13,KZZD-EW-04-03-03）
