摘要
以定西市1998-2007年10 a间土地利用及其动态变化数据为基础,分别采用土地利用结构变化的贡献率、变化强度指数和变化速度以及单一土地利用动态度,对这10 a间土地利用结构的时序变化和空间变化进行了分析研究.结果表明:近10 a来,定西市土地利用结构发生了较大的变化,耕地、未利用地和水利设施用地逐年外流,其中耕地每年外流的幅度最大;林地、居民点、工矿用地和交通用地迅速增加,其中林地每年的增加幅度最大;园地和牧草地的变化不明显.据此认为,定西市在今后的土地利用过程中,应加强土地的集约利用,防止耕地数量减少,在保证粮食安全的前提下,保持现有林地,适当供应建设用地.
Based on land use and its dynamic change data of Dingxi City from 1998 to 2007, temporal and spatial changes of a land use structure during these 10 years were analyzed by using the contribution rate,intensity index and speed of land use structure changes and land use dynamic degree of single land type. The results showed that：in past 10 years, land use structure of Dingxi City had great changes,cultivated land, unused land and water conservancy facilities land outflowed year after year, especially the culti vated land. Forest land, rural settlement area and land for transportation increased rapidly, among which forest land increased most. The changes of landscape and grazing land didn＇t have obvious changes. It could be concluded from the results that：in Dingxi City, during the process of land use in the future, the land intensive use should be enforced, the quantity of cultivated land should be controlled seriously and make sure that it will not decrease, on the premise of food security, forest land should be kept and some land should be properly used for construction.
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2009年第4期132-136,共5页
Journal of Gansu Agricultural University
