摘要
长江三峡花岗岩地区坡面土壤流失以耕地砂砾化面蚀和有部分植物覆盖坡面的鳞片状面蚀为主，该地土壤流失研究结果表明，由以上两类面蚀导致的土壤流失量月分布与月降雨量的分布基本趋势一致，二者呈现较为明显的线性相关关系。地面坡度＞３０°的裸地土壤流失量达５０００ｔ／ｋｍ３·ａ以上，覆盖度≥０．７０的林地土壤流失量＜５００ｔ／ｋｍ２·ａ，该流域土壤流失量为１５４４．１４ｔ／ｋｍ２·ａ，产沙量为６９４．
The main forms of soil loss are surface erosion on the farm land and sheet erosion on some forest stand in Granite region of the Three gorge of the Yangtze River.The result of this study shows that the general trend of monthly distribution of soil loss caused by the erosion forms is in keeping with the monthly rainfall,and there is obvious linear relationship between the two.The amount of soil loss on bare steep slopes with a gradient of over 30°,is over 5 000 t/km 2·a and on forest stand with coverage above 0.70 is less than 500 t/km 2·a.The average amount of soil loss is about 1 544.14 t/km 2·a,and the sediment yield is 694.86 t/km 2·a on the watershed.
出处
《长江流域资源与环境》
CAS
CSCD
1997年第4期368-373,共6页
Resources and Environment in the Yangtze Basin
基金
国家"八五"科技攻关专题
