中国土地退化的分类与分级

Classification and Grading of Land Degradation in China.

在参照国际上土地退化评价指标体系的基础上,结合中国实际,从代表性、普遍性和可操作性原则出发,提出了中国土地退化的初步分类与分级标准。中国土地退化可划分为风蚀作用下的土地退化、水蚀作用下的土地退化、物理退化和化学退化4类,土地退化程度分为轻度、中度、强度和极强度退化4级,并拟定4类土地退化的评价标准。

Based on reference to some evaluation criteria of land degradation which are commonly used in some international organizations, and the principle of representativeness and universality and serviceability, a tentative standard is worked out for classification and grading of land degradation in China. According to the standard, the land degradation in China has been divided into 4 categories, i.e. wind-induced land degradation, water-induced land degradation, physical land degradation and chemical land degradation. The extent of land degradation in China has also been divided into 4 grades, i.e. light, medium, strong and extremely strong. The evaluation criteria for categorizing and grading are proposed.