摘要
紫色土丘陵区小流域地面侵蚀类型主要有面蚀、沟蚀和母质侵蚀三种，本文采用铯－１３７同位素示踪法测算了小流域坡面土壤侵蚀模数的多年平均值；用小区法、径流场法和侵蚀针测法分别测定了相同降雨条件下小流域内面蚀、沟蚀和母质侵蚀的侵蚀模数，进而换算出紫色土丘陵区单元小流域地面侵蚀的多年平均侵蚀模数。所得结果为求取小流域泥沙输移比及预报地面侵蚀量建立了基础。
There are three types of the surface erosion in the small watersheds in the hilly area of purple soils. In this paper , using Cs-137 as a tracer,the long term average modulus of erosion of slopeland of small watershed is determined,while annual soil loss of slope land,.gully and parent materialsare determined by experimental plots, runoff experimental field and erosion pin respectvely under the same rainfall condition. Thus their relative ratio is obtained. Then the long-term average modulus ofsurface erosion of the elemental small watershed is calculated. The results made it possible to calculatesediment delivery ratio and to predict surface erosion of the small watershed.
出处
《长江科学院院报》
CSCD
北大核心
1995年第1期51-56,共6页
Journal of Changjiang River Scientific Research Institute
基金
长江水土保持局资助
关键词
紫色土
地面
侵蚀
长江上游
单元小流域
surface erosion
Cs-137 tracer method
purple soils
elemental small watershed
