STUDY ON THE STRUCTURAL LANDSCAPE OF DIFFERENT LANDFORMS IN TYPICAL KARST WATERSHED——A CASE OF XIAOJIANG WATERSHED OF YUNNAN PROVINCE,CHINA

On the basis of TM image of Xiaojiang watershed and field investigation,as well as according to the geological distribution and the situation of landform growth,the paper divided the types of watershed landform into two landscapes.One is karst landform and the other is non-karst landform.Then combining with landform growth and elevation situation,we divided the karst areas into six karst landscapes,and non-karst areas into two non-karst landforms.We have calculated some correlative indices by Fragstats 3.3 on the watershede hierarchy,with the landscape ecology principle.The results indicate that,on one hand,characteristics of landscape ecology in the karst areas has manifested its ecological environment particularity and the vulnerability on the whole,and the deficiency of surface water resources,the thin soil layer,and easy to be eroded,as well as soil resources fragmentary distributed,So it causes the area of unused land more large,serious phenomenon of karst rocky desertification,and low degree of land utilization.On the other hand,cultivated land and forest land are the absolute superiority in non-karst landscape.The areas of karst rocky desertification are small.So it caused the low heterogeneity and simple structure of landscape.