摘要
岷江上游茂县,汶川一带的干旱河谷是优质苹果的生产区。目前该区水土流失极为严重。表现为:沟蚀强烈,片蚀普遍,滑坡频繁,泥石流时有发生,河谷底部风蚀作用强。导致水土流失的原因是:植被稀疏,河谷幽深,土层松散,乱砍滥伐与陡坡垦殖。
The dry river valleies of Wen Chuan aud Mao county in the upper course of Ming Jiang are the main regions for apple Production and the important protective areas of ecology of Ming Jiang valley. Now the soil and water loss is serious in the (areas).There are strong gully erosion, often sheet erosion, very common slip and sometimes block glacier. Winding erosion gives rise to serious sandification in parts of the valleies. The causes of the above are rare. plant cover, bad protective land surface, deep river valley, loose structure, weak risistance to erosion, over cutting of forest and planting of steep slopes.
出处
《四川农业大学学报》
CSCD
1990年第4期351-354,共4页
Journal of Sichuan Agricultural University
