基于3S技术的三峡库区不同高程带景观格局研究--以巫山县为例

在3S技术的支持下,采用景观面积比、分维数、多样性指数、斑块平均面积、破碎度等景观格局指数分析了三峡库区内巫山县不同高程带的景观格局。结果表明,不同景观要素在同一高程带内的格局特征不同。通过对不同高程带景观格局的综合分析可知,随高程的增加,景观多样性指数逐渐减小,分别为1.332,1.242,1.203,1.061,0.837;景观斑块的分维数依次是1.239,1.189,1.176,1.173,1.208;斑块平均面积分别为64.93,35.29,39.65,59.40,101.03hm2,呈现出两头大中间小的状态。

Landscape Pattern at Different Elevations Above Sea Level in Three Gorges Area Using 3S-A Case Study in Wushan County

Supported by GIS, landscape pattern at different elevations above sea level in the Three Gorges area is determined from the proportion of land area at specified elevations compared with total landscape area, the fractal dimension of landscape patches, the landscape diversity index, the mean patch area and the landscape fragment index. A key conclusion is that the landscape pattern of similar landscape components varies at the same elevation; Results from the broad scale pattern of landscape characteristics at different elevations are as follows: landscape diversity decreases (1.332, 1.242, 1.203, 1.061, and 0.837) with the increasing of elevation; the fractal dimension varies (1.239, 1.189, 1.176, 1.173 and 1.208) with the increasing of elevation; and the mean patch area varies (64.93, 35.29, 39.65, 59.4, 101.03 hm~2) with the increasing of elevation.