甘肃中部地区景观生态格局与土地利用变化研究

The Landscape Ecology Spatial Pattern and Land Use and Cover Change Research in the Center of Gansu Province

采用1986～2000年TM和ETM+影像数据,计算景观生态指数得出整个地区景观生态空间格局,通过对土地利用/覆盖变化的时空变化分析.实现空间格局和地理时间变化过程的小尺度区域有机结合.对干旱半干旱脆弱生态环境下城镇较为密集地区的人地关系研究具有典型意义。研究表明:低、中覆盖度草地构成本地区基质,沟谷河谷与交通通道是联系乡村和城市的主要廊道.本地区属于人类影响渐强区.在干旱半干旱自然条件下,城镇用地扩张是整个地区土地利用变化主要因素.农业结构调整在空间上改变着空间格局。

The landscape ecology pattern and the land use and cover change in the center of Gansu province were investigated through land use/cover classification of two sets of TM/ETM images acquired on July 31, 1996 and May 23, 2000. Through calculating to get the indexes of landscape ecology to judge the region's ecology pattern, analyzed the region's land use/cover change in the time-spatial course, it is important to research the relation between the human and the land for the north -west region in China which the cities and towns is dense. The research results are as follows: lower and middling cover rate grasslands constitute the substrate in Lanzhou Metropolitan Coordinating Region. The valleys and transport channels constitute the region's substance and energy corridors. The research region belongs to districts of human impact intensified. The nature surroundings is the form basic in ecology pattern, the water is the most important factor to change the region's appearances. The relation between the land and the water in the region dominate the change direction in Lanzhou Metropolitan Coordinating Region. In the 19 administration regions, Lanzhou and Linxia city have changed distinctly in the process of Great Western Region Development. From 1986 to 2000, the land's expanding is the main factor in the region's land use, the agriculture structure adjustment changes the landscape patterns.