关键词: 张掖绿洲, 土地利用格局, 影响因子, 典型相关分析

Abstract: Based on the interpretation of composite image of band 4, 3, 2 of Landsat 5 taken in 2000 according to land resources classification system of 1∶100000 in Resources and Environmental Database of Chinese Academy of Sciences(CAS), the authors carried out the study on land use pattern of Zhangye oasis in the middle of Hexi Corridor. Canonical correlation analysis(CCA)was also applied to analyze the land use pattern and influential factors, by which the authors drew the contributions of each factor to the forming of land use pattern. At the same time, the authors used the coefficient of CCA and redundancy degree to verify the analysis results. The results show that the land use pattern is influence comprehensively by both natural factors and social-economic factors. Influential factors extracted by quantitative analysis consist of annual average precipitation, annaual average evaporation, annual average air temperature, total population, GDP and total cultivated area. The distribution of cropland correlates to cultivated area and total population positively, which shows that corpland will increase with the expanding of population. While the distribution of woodland shows strong positive correlation to annual precipitation and negative correlation to annual average temperature, from which it can be inferred that woodland is mainly controlled by precipitation and also constrained by local air temperature. Land of urban and built up correlates to GDP positively, but correlate to annual evaporation negatively, which implicates that as GDP increases, land of urban and built up will also expand. But drought is not good to the distribution of urban and built up.

Key words: Zhangye oasis, land use pattern, influential factors, canonical correlation analysis