Landscape heterogeneity changes in landscape system of eastern section of Qilian Mountain

Landscape pattern theory method is used for analysis the changes of spatial structure and heterogeneity in the eastern section of Qilian Mountain landscape.The results show that mountain landscape is constituted by five landscape elements.Grassland landscape element is matrix in mountain landscape.The water landscape distributes by linear and it is corridor in mountain landscape.The remaining elements of the landscape as a plaque mounted on the substrate and between the corridors.From 1994 to 2008,mountain landscape system which landscape diversity index system decreased by 1.9 %;in mountain landscape,the landscape diversity index increased in grassland and snow landscape element,the increased rates were 49.0 % and 4.8 %;The remaining elements of the landscape diversity index decreased.Mountain landscape system which landscape dominance index increased,the rate of increase was 12.8 %.In the mountain landscape,the forest landscape element,bush landscape element and water landscape element which landscape dominance index increased.But the lawn landscape element and snow and ice landscape element which landscape dominance decreased.The mountain landscape system which evenness decreased,the rate of decrease was 1.9 %.Mountain landscape which landscape fragmentation decreased,the rate of reduce was 22.27 %.The forest landscape element which landscape fragmentation increased 17.05 % and the others decreased.Mountain landscape system which landscape separation reduced,the rate of reduce was 9.81 %.In mountain landscape system,every landscape element which landscape separation was reduced.Comprehensive index of all the changes in landscape structure,we draw a conclusion as the mountain landscape system which landscape heterogeneity is reduced.