我国南方土地侵蚀特点

境内土地侵蚀严重，以水蚀为主，其面积６８３３２０ｋｍ２，占全国水蚀面积的３８％．讨论了：滑坡、泥石流侵蚀；碳酸盐岩、花岗岩和红层各具特色的侵蚀；土地侵蚀的危害严重，石化面积在扩大，中小河道淤高；塘库、湖泊遭淤，容积缩小；南方土地侵蚀泥沙输移比较小．

ON LAND EROSION IN SOUTH CHINA

The land erosion is very serious in South China, including 15 provinces mainly and the watererosion is main. The water erosion occupies an area of 683 320km2,being 38. 1 % of total watererosion area in China. The land erosion in South China has himself characteristic, which differsfrom Nouth China, as a result of natural and social environment.The following questions are discussed in this article:1. The debris flow and landslide are widely distributed and developed in west mountainousregion.2. The limestone, granite and purple rocks have a very widely distribution, as well as possessthemselves erosive characteristics.3. The harm of land erosion is severe. The main harms are as follows: the area of bare rockis developing. The moderate and small rivers were deposited,the river bed is rising gradually.The reservoir and lake were dePOsited by sediment too,and their capacity is reducins gradually.4. The sediment delivery ratio of land erosion is small,only 0. 1-0. 5.