Study on LUCC Characterization of Typical Oasis Stability in Arid Region

摘要

Using remote sensing imagery data of 1990,2000 and 2005,and taking the typical oasis in Bohe and Jinghe Watershed as the study area,the process and trend of oasis LUCC are analyzed by applying the methods of remote sensing(RS),geographic information(GIS) and statistics since 1990.The main results of oasis LUCC in Bohe and Jinghe Watershed are as follows from 1990-2005.(1)The change extent of oasis LUCC was that the farmlands increased steadily and the unused lands decreased quickly.Meanwhile,the woodlands decreased in previous decades and increased in next five years.(2) The type conversion of oasis LUCC shows obvious transitional process in bi-direction. But the status of oasis LUCC was quasi-balanced in transitional speed.(3) The degree of land using had improved.But the trend of that became slow.(4)The oasis stability became strong but the speed became slow in Bohe and Jinghe Watershed based on the theoretic analysis of the relation that land using affects oasis stability.(5)The changing in oasis land using are the results of inputing negative entropy by human-being.