摘要
在RS和GIS技术支持下,利用1990、1995、2000和2006年共4期Landsat TM卫星遥感数据,分析珠海市耕地数量和空间变化特征,并探讨耕地动态变化的驱动因子。结果表明:珠海市耕地面积在3个研究时段经历了"快速减少―缓慢增加―急剧减少"的变化过程,人均耕地面积持续减少;2000―2006年耕地的动态度最大,而1995―2000年耕地的动态度相对较小;耕地面积增加的主要来源是水域和林地,减少的去向主要是农业结构调整中耕地转变成水域和建设用地;经济发展、人口增加和农业结构调整是珠海市耕地变化的主导驱动因素,同时政策因素也起到了重要的导向作用。
This paper aims at revealing how cultivated land changed since the 1990s in Zhuhai. Based on the remote sensing data of 1990, 1995, 2000 and 2006, combined with social-economical statistic data from 1990 to 2006, spatial and temporal changes and mutual conversion with other land use of cultivated land in the past 16 years are analyzed quantitatively by means of GIS technology. Furthermore, the driving forces of cultivated land change are discussed in details by the method of principle component analysis. The results show that the area of cultivated land has undergone a process of rapid decrease -slow increase - dramatical decrease, with a total decrease of 33 585.38 hm^2 in the whole periods and an average of 2 099.09 hm^2 per year.It was spatially distributed in Doumen region and Xiangzhou region, per capita cultivated land reduced continually from 0.105hm^2 in 1990 to 0.023 hm^2 in 2006. The dynamic degree of cultivated land use was the biggest from 2000 to 2006. In addition, the dynamic degree of paddy field was bigger than that of cultivated land and dry land in three study periods, which indicated that the change degree of paddy field was the fiercest in cultivated land types. By mutual conversion analysis of cultivated land and other land use, it is found that the increase of cultivated land area mainly originated from water body （56.75 % ） and woodland （31.32 % ） , The lost area of cultivated land were 50 840.43hm^2, which were mainly converted to water body （ 50.84 % ） and construction land （ 33.88 % ） in the past 16 years. Development in economic and population and adjustment of agricultural structure are shown to be the dominating driving forces for the cultivated land change in the whole study period. Simultaneously, government policies play an important guidance role.
出处
《热带地理》
北大核心
2009年第5期472-476,482,共6页
Tropical Geography
基金
国家自然科学基金资助项目(40771003)
教育部科学技术重点项目资助(108171)
国家科技支撑计划项目(2006BAJ05A10)
关键词
耕地
时空特征
驱动力
主成分分析
珠海市
cultivated land
spatial-temporal characteristics
driving force
principle component analysis
Zhuhai
