关键词: 定西地区, 土壤侵蚀, 水土保持

Abstract: Severe soil erosion is the main cause of environment deterioration in Dingxi District of Gansu Province,and it is also one of the main limit factors on the development of this area.After a comparison of investigation results between 1995 and 2000,it is found that in the 5 years,the soil erosion area has been reduced by 1 446.39 km²,or 7.36%,among which,5.63% is light degree erosion,1.4% is middle degree erosion,0.03% is intensive degree erosion and 0.30% is very intensive degree erosion.As a whole,the degree of soil erosion has been alleviated a little.These show that the controlling countermeasures have attained some achievements.But the erosion area is still at 80% of the district area,and the reduced intensive and very intensive erosion areas are very small,these imply that the soil erosion in this region is still severe and the task of soil conservation is still hard.Some concrete methods for treating soil erosion in this region are presented in this paper.

Key words: Dingxi District, soil erosion, soil conservation