ON CURRENT CULTIVATED LAND CHANGE BASED ON GEOMORPHOLOGY AND SPATIAL DIFFERENTIATION CHARACTERISTICS
基于地貌和空间分异特征的中国近期耕地变化分析

Using both land resources database accomplished during the 8th Five Year Plan period and that accomplished during the latest 10th Five Year Plan period, this paper analyzes the changes on cultivated land during the early 1990s to the mid 1990s in China. The result indicates the existence of apparent regional differences in change. Of which the division of Huang Huai Hai Plain witnessed the largest scale decrease of cultivated area whereas the division of hilly area in Southeast China experienced the substantial expansion of cultivated land area. It points out that dynamic differences of cultivated land in each division are also obvious according to the analyses of proportional changes of cultivated land area of various basic research units at first level division to the total cultivated land area. In order to compare quality changes of the cultivated land on the whole, the overlaying of 1:1,000,000 national geomorphologic map with basic research unit map was done and geomorphologic type of each unit as well as cultivated land change of each geomorphologic type in each land use division was obtained. Generally speaking, both the absolute decrement and the relative decrement of cultivated land in plain area are the highest among the five geomorphologic types whereas on the highland, decrease of cultivated land was the most.