Dynamic change of landscape patterns of Momoge wetland in the last two decades

Wetland degradation and its negative effect have long been considered as a hot yet complicated topic. Therefore, it has significance to research landscape patterns and their dynamic changes. Based on Landsat-5 TM data in 1988, 2001, 2007 respectively, the dynamic change of landscape patterns in last two decades is quantitatively analyzed by conversion matrix, landscape index model and centroid model for Momoge National Natural Reserve. The results are as followed: (1) the area of farmland increased from 29594.934 hm2 to 34002.354hm2 during 1988-2007, but the wetland area decreased from 68635.274 hm2 to 59356.598hm2 simultaneously. (2) Human and climate interference caused the change of landscape patterns. In all three periods, landscape patterns of wetland became more fragmentized and the patch counts were 160, 88, 91 respectively. The SHDI was 1.932, 1.770, 1.772 and SHEI was 0.879, 0806, 0.807 respectively. The entironment of Momoge wetland worsened gradually, but the rate of degradation mitigated in some sort since 2001. (3) Decrease of wetland area resulted in a shift of wetland landscape patterns centroid southeastward by 4454.95 meters.