摘要
严重的土壤侵蚀是定西地区生态环境恶化的主要原因,也是社会经济发展的主要限制性因素之一。利用数字遥感影像人机交互解译技术对1995年和2000年的土壤侵蚀进行调查,结果显示5a来定西地区土壤侵蚀面积减少1446.39km2,减少了7 36%。其中轻度侵蚀减少5 63%,中度减少1 4%,强度减少0 03%,极强度减少0 30%。侵蚀程度整体上有所减轻,表明水土保持工作取得了一定成效。但土壤侵蚀面积仍然占土地总面积的80%以上,而且强度和极强度侵蚀面积减少不明显,土壤侵蚀仍然十分严重,水土保持的任务还相当艰巨。积极开展水土保持是定西地区实现山川秀美、脱贫致富和可持续发展的根本途径。
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, 563% is light degree erosion, 14% is middle degree erosion, 003% is intensive degree erosion and 030% 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.
出处
《中国沙漠》
CSCD
北大核心
2003年第4期403-407,共5页
Journal of Desert Research
