三峡库区腹地土地功能演变及其驱动机制分析

土地利用功能在一定程度上反映了土地利用方式和强度的变化。以三峡库区腹地奉节县和巫山县为研究区域，以1986、2000、2007和2015年多时相遥感影像资料为数据源，通过空间自相关和冷热点分析等研究方法，分析土地利用功能的时空演变规律，并探索其与海拔、坡度和岩性等自然因子，以及人口、道路等社会经济条件的耦合驱动机制，揭示土地利用功能的理论现实意义。研究发现：(1)就土地利用功能数量而言，生活用地增加，生产功能减少，生态用地总体趋于稳定；就土地利用功能面积变化格局而言，三生功能均向稳定性方向发展。(2)就其集散程度而言，生产功能由大集聚向小集聚转变且集聚面积减少；生活功能集聚性持续增强，且集聚面积扩大；生态功能由集聚向分散变化，且空间范围增加。(3)就土地利用功能的驱动机制而言，包括高程、坡度和岩性在内的自然因子影响其空间分布状况，人口及道路分布影响三生功能的空间数量变化。

Analysis of Land Function Evolution and Its Driving Forces in the Hinterland of Three Gorges Reservoir Area

Land use function reflects the change of land use pattern and intensity to a certain extent.The paper takes the hinterland of the Three Gorges Reservoir area Fengjie County and Wushan County as the study areas,analyses temporal and spatial evolution of land use function,and explore the natural factors such as altitude,slope and lithology factor,as well as the coupling driving mechanism of population,road and other social and economic conditions,to reveal the theoretical and practical significance of land use function using spatial autocorrelation,hot spot analysis and other research methods based on multi-temporal remote sensing image data of 1986,2000,2007,2015.The results shows:1.In terms of the quantity of land use function,the living land shows an increase,while the production function decreases,and the ecological land tends to be stable.On the change of land use function area,the three functions shows a stable development;2.As far as the distribution is concerned,the production function is changed from the large to the small and the gathering area is reduced;The clustering of life function continues to increase,and the area is enlarged;The ecological function is changed from agglomeration to decentralization with an increase area;3.As for the driving mechanism of land use function,natural factors,including elevation,slope and lithology,influence the spatial variation of the three function.