Landscape pattern and stability analysis of Jiuzhaigou Nature Reserve in Sichuan China

Based on TM image data in 1997 and 2005, supported by RS and GIS techniques, seven indices were put forward to analyze the landscape pattern and stability of Jiuzhaigou Nature Reserve, these indices included diversity, dominance, evenness, fragmentation, isolation, fractal dimension and stability index. The results showed that: (1) the numbers and areas of landscape patterns were in the disproportion, the forestland and grassland being in the especial absolute advantage, the forestland was the landscape matrix in research periods; (2) during the research periods the diversity and evenness of the entire landscape decreased, the dominance and fragmentation increased, showing that the human disturbance factors and the dominance of forestland and grassland being increased;(3) the stability of the landscape patterns were improved, the construction land, grassland and water areas were in greatest changes which should be paid particular attention. Finally, some sustainable developmental countermeasures of landscape patterns were put forward accordingly.