空间信息系统支持下的三峡库区土地利用时空变化分析

论文利用近50年来长序列统计资料对赤峰市耕地动态变化进行了研究，结果发现：1950年-2000年赤峰市耕地总量经历了3个增长期和2个减少期；耕地变化除具有以全市总量变化为代表的普遍特征外，南部和中北部具有明显的区域差异，主要表现为，50年来，与中北部各旗（县）相比，以敖汉旗为代表的南部3旗（县）耕地相对变化率较小，但1961年-1990年耕地减幅较大；通过文献调研和定量研究得知，50年来赤峰市耕地变化主要受5次大的政策因素驱动，并与人均国内生产总值、总人口、年末牲畜存栏总头数、粮食单产和人均粮食占有量等人口和经济发展因素显著相关。

SPATIAL-TEMPORAL VARIATION OF LAND USE IN THREE GORGES'PROJECT AREA BASED ON SPACE INFORMATION TECHNOLOGIES

Located in the mountainous area, Three Gorges' Project area covers more mountains than plains and the land resources within this region is very limited due to the high ratio of agricultural population. Especially in recent years, the construction of the Three Gorges' Project brings about many new issues as emigrants moving, cities and buildings relocating and so on. Besides, there are many problems related to land utilization. For an instance, the construction of new infrastructure accompanied the Project had taken up a quantity of high quality cultivated land; moreover, soil erosion and leanness resulted from forests destruction and slope land development are growing serious. As a result, the types, quantities and ways of land use within this region are greatly changed during these years. Therefore, main concern of this paper, firstly, is devoted to the spatial and temporal changes of land use in the Three Gorges' Project area, by means of space information technologies. And then, the characteristics and laws of the land use change from year 1986 to 2000 are analyzed. Finally, the causes of the main land use types change in terms of physical and social factors are further analyzed. The results of this paper are expected to provide theoretical basis and scientific references not only for the local government, but also for further researches concerning about rational development, utilization and management of land resources.