Disturbance of mining activities to ecological land measured by ecological connectivity

摘要

Ecological land is the key factor to maintain ecological stability; however ecological land is always damaged by mining.In order to get the disturbing influence from mines to the ecological land,2 different time-point land,using maps of Wu'an city,in 2005,2009 respectively,are used to extract the distribution of ecological land in the study area for a calculation of ecological connectivity index of the whole area.Meanwhile,the paper indicates the fragmentation trend with the important values of patches.It's necessary to take the affected distance from mines to ecological land into consideration,therefore the area is divided into 2 gradients with 3 km as a gradient and the distribution and metastasis of important patch in each gradient are analyzed.The conclusion of this method concentrates on two aspects.Firstly,the ecological connectivity index of whole area shows a downward trend.Secondly,there is a relationship between time,location and mining influence on environment.