滇池流域土地利用演变及景观生态安全评价研究

以1995年、2005年、2015年3期Landsat卫星遥感影像为基础，分别对滇池流域土地利用数量变化、空间变化和景观生态安全3个方面开展研究，分析滇池流域土地利用演变特征及景观生态安全格局。结果表明：1995—2015年，研究区土地类型以建设用地、耕地、林地和水域为主，其中林地、耕地和湿地面积减少，建设用地及未利用地面积增加，水域和灌草地面积波动变化；1995—2015年，研究区耕地转移面积最多，20 a缩减46%，主要转变为建设用地。建设用地新增面积最多，2015年面积是1995年的1.6倍，转入源主要来自耕地、湿地及林地；1995—2015年，研究区面积以较高安全区及中度安全区为主，3个时期景观生态安全指数均值分别为38.16、41.50、42.19，安全等级呈缓慢增长趋势。

The Study of Land Use Evolution and Landscape Ecological Security Evaluation in Dianchi Lake Basin

The characteristics of land use evaluation and landscape ecological security pattern were analyzed based on Landsat remote sensing images in 1995, 2005 and 2015 to conduct research from 3 aspects of land use quantity change, spatial change and landscape ecological security of Dianchi Lake basin. The results show that from 1995 to 2015, the land types in the study area are mainly construction land, arable land, forest land and water area, among which the area of forest land, arable land and wetland decreases, the area of construction land and unused land increases, and the area of water area and irrigated land fluctuates; from 1995 to 2015, the arable land transferred to the research area was the largest, with a decrease of 46% in 20 years, and it was mainly converted to construction land. In 2015, the area of construction land increased by 1.6 times as much as that of 1995, mainly from arable land, wetland and forest land; from 1995 to 2015, the area of the study area was mainly higher security zone and medium security zone, and the average value of landscape ecological security index in the 3 periods was 38.16, 41.50 and 42.19, respectively, showing a slow growth trend of security level.