Study on localization of temporal and spatial variation in karst peak cluster in Guilin

In order to discuss the impact of local eco environment changes on the entire eco environment in Guilin, 8 zones of peak cluster are selected as the study object from Liucunnan to Jiedi along the north bank of the Lijiang River（No.1～No.8）, localization extraction and temporal and spatial variation analysis have been done for the RS habitat index, NDVI and the greenness component ( TC2) of Tasseled Cap in the selected 8 zones by means of localized and quantitative RS in region of interest (ROI) technique with the data come from TM of Landsat 5 in 1986, 1991 and 2006 and other geology and geography information. The results show that,the NDVI and TC2 indexes at the peak clusters are the highest in 2006 and the eco environment is the best; it takes second place in 1986 and worst in 1991 proving the habitat is blighted due to the ignoring of environmental protection during economic develops rapidly in Guilin at the end of the 1980’s and the beginning of 1990’s in the 20th century, however, it is improved obviously in the 21st century with some patches or bands assuming high eco environment rank showed by NDVI and TC2 (i.e. NDVI index＞0.4 and TC2 index＞20) , which tends to enlarging to the whole area from 1991. The values of NDVI and TC2 are of the tendency low in 1991 and high in 1986 and 2006 in the same region but different time, and there is also difference in NDVI and TC2 value at the same time but different region. From good to bad relationships, the arrangement is，No.5＞No.4＞No.3＞No.8＞No.7＞No.6＞No.2＞No.1.