丹江口水库库周景观格局动态变化分析

Analysis of Dynamic Change of Landscape Pattern in the Surrounding Areas of Danjiangkou Reservoir

运用ENVI5.0软件对丹江口水库区域1987年、1997年、2007年、2017年4个时期的遥感影像进行土地利用分类,通过景观格局指数研究分析景观格局的动态变化特征。研究结果表明:在研究期内,受人类活动和政府政策影响,丹江口水库库周耕地面积波动幅度较大,裸地面积出现了大幅度下降,林草地、水域和建设用地面积增加;在经济建设和人类活动影响下,景观的空间格局指数变化较明显,丹江口水库及周边区域的整体景观形状趋于复杂化,各类土地利用类型的破碎化程度提高;政府政策和水库蓄水是丹江口水库库周景观格局变化的重要驱动力。

The information about landscape features of Danjiangkou Reservoir area in 1987,1997, 2007 and 2017 were extracted respectively based on remote sensing images and by remote sensing(RS) software ENVI5.0. The dynamic change characteristics of landscape pattern were analyzed by means of landscape pattern index. The results show that on the class level, the arable land area of Danjiangkou Reservoir fluctuates greatly under the influence of human activities and government policies. The biggest changing amount and the fastest rate of change is arable land, the area of bared land declined significantly and the areas of green land, water and construction land are increased. Under the influence of economic construction and human activities, the spatial pattern index of landscape changes significantly, the overall landscape shape of Danjiangkou Reservoir and surrounding areas tends to be complicated and the degree of fragmentation of various land use types is increased. Government policy and reservoir storage are important driving factors for the change of surrounding landscape pattern of Danjiangkou Reservoir.