河西走廊张掖绿洲LUCC的驱动力分析

Analysis on Driving Factors of LUCC in Zhangye Oasis of Hexi Corridor

利用1995和2000年Landsat 5、4、3、2(RGB)波段合成影像解译结果,采用中国科学院资源环境数据库中的中国1:10万土地资源利用分类系统,对河西走廊中段的张掖绿洲的土地利用/覆被变化(LUCC)进行了研究。并运用典型相关分析方法对张掖绿洲LUCC及其影响因子进行了统计分析。诊断出各影响因子对该区LUCC的贡献作用大小,同时运用典型相关系数和冗余度分析,检验了分析结果。

Based on the interpretation of composite image of band 4, 3, 2 of Landsat 5 of 1995 and 2000 according to land resources classification system of 1: 100000 in Resources and Environmental Database of CAS, this paper carried out the study on LUCC of Zhangye oasis in the middle of Hexi Corridor. Canonical correlation analysis was also applied to analyze the LUCC and driving factors and drew the contributions of each factor to the forming of LUCC. At the same time, the authors used the coefficient of canonical correlation analysis and redundancy degree to verify the analysis results. The results show that the main driving factors of the increase of urban area and built-up area and cropland are the increase of population, GDP and average income per capita etc. But for the decrease of grassland, woodland and water, the causes are relative complex. The decrease of precipitation, the increase of temperature and the enlargement of investment in agriculture may all contribute to it. At the same time, some cropland and unused land have converted to grassland and woodland, which were mainly caused by ecological security and policies etc. Analysis combined with the type of driving factors shows that the change in cropland structure is mainly the result of optimum economy welfare and the security of food. While, the cultivation of grassland and woodland usually results from the survival economy welfare. Also, optimum economy welfare contributes to it. In area with fragile eco-environment and intense external impact, the security of environment brings the recovery and reconstruction of woodland and the best utilization of unused land.