RESEARCH ON QUANTITY AND STRUCTURE CHANGE OF CULTIVATED LAND FROM 1998 TO 2007 IN CHINA
基于国土资源部调查数据，分析了1998-2007年中国耕地数量与结构变化，发现旱地占比最大且减少最快，水田和旱地减少是主要特征，但灌溉地和菜地面积增加，耕地质量有所提升。
Based on the data of land use survey acquired from the Ministry of Land and Resources,this paper analyzed the quantity and structure change of cultivated land from 1998 to 2007 in China.This research concludes: 1) proportion of irrigated paddy field,upland paddy field,irrigable land,dry land and vegetable land are 22.61%,3.40%,17.66%,55.13% and 1.19% respectively.The dry land has absolute proportion in cultivated land.2) The change ratio of cultivated land,irrigated paddy field,upland paddy field,irrigable land,dry land and vegetable land from 1998 to 2007 are-6.04%,-3.45%,-4.29%,-0.58%,-8.81% and-3.00% respectively.The main character of cultivated land change is the decrease of dry land,irrigated paddy field and upland paddy field.3) Because of the land use type convertion from irrigated paddy field to irrigated land and from irrigated land to vegetable land,the irrigated land and vegetable land area in some provinces of China increased from 1998 to 2007.The quality of cultivated land structure was improved because no irrigation cultivated land decreased relative quickly in recent years.