兰州市南北两山生态建设效应的遥感监测

利用1999年Landsat ETM+、2005年Landsat TM卫星影像和2009年“环境与灾害监测预报小卫星”影像提取兰州南北两山地区三期土地利用数据,将景观生态学的理论与兰州南北两山环境绿化工程的实际相结合,运用GIS分析、景观指数计算及数理统计等多种方法,对兰州南北两山地区1999—2009年的土地利用与景观格局动态变化进行分析。结果表明,10 a来兰州南北两山的土地利用变化主要表现为林地和建设用地的增加,草地和农田的减少;景观格局趋于破碎化,多样性增大,景观结构趋于多样化和均匀化。驱动力分析表明,人类活动和政策因素是导致该区土地利用和景观格局变化的主要原因。

Ecosystem Construction Effects in Southern and Northern Mountains of Lanzhou by Remote Sensing Monitoring

Based on the Landsat ETM+ images in 1999, Landsat TM in 2005 and Environment and Disaster Monitoring Small Satellite images in 2009, the land use data of the three periods in southern and northern mountains of Lanzhou were extracted. The variations of land use and landscape pattern in southern and northern mountains of Lanzhou during 1999—2009 were analyzed based on the land use data and GIS analysis, landscape indices calculation and mathematical statistics. The results showed that, in the past 10 years, forest and residential lands increased obviously, grass land and farm land decreased; Landscape pattern tended to fragmentation, landscape diversity increased, and landscape structure tended to diversity and homogenization. The analysis of driving forces showed that the human activity and policies were the main affecting factors which led to changes of land use and landscape pattern.