【摘要】 利用中国 1990～ 2 0 0 0年土地利用矢量数据和自然区划图 ,将中国分为 6级城镇用地区。第一级城镇用地分类包括辽东胶东山地丘陵、华北平原、鲁中山地丘陵、淮河及长江中下游平原、粤桂闽丘陵平原、华北山地丘陵。这些地区城镇用地比重高 ,城镇扩展速度快 ,城镇扩展面积占全国城镇扩展面积的 71 4 7% ,城镇扩展造成耕地面积减少占全国的 6 9 88%。城镇扩展占用的主要是耕地资源 ,占其扩展面积的 78 96 % ;其次农村居民点用地占 10 2 % ,林地占4 4 8% ,草地占 2 6 % ,水体占 1 5 6 % ,独立工矿用地占 1 4 3% ,未利用地占 0 4 3%。城镇居民点用地扩展占用大量的耕地资源 ,从而造成耕地资源的大量减少 ,威胁中国的粮食安全更多还原

【Abstract】 Five urban area were classified by the land use vector data and natural zoning map of China during 1990～2000. The first grade urban area included East Liaoning and East Shandong mountain and upland, North China plain, Middle Shandong mountain and upland, Huaihe basin and middle and lower reaches of Yangtze River, Guangdong, Guangxi and Fujian mountain plain, and North China mountain upland. The urban landuse percentage of these area and the speed of urban expansion were higher. The urban expansion in these area amounted to 71 47% of the total expansion of China, and the loss of cultivated land was 69 88% of the total,among which, North China was 24 54%, and Huaihe basin and middle, lower reaches of Yangtze River was 20 15%. The major source of urban land was derived from cultivated land and the percentage was 78 96%. A great amount of cultivated land will be lost by urban expansion,which will threaten the grain safety in China.更多还原