基于主成分分析法的西安市耕地变化驱动力研究

Driving Forces Study Based on Principle Component Analysis for Cultivated Land in Xian City

利用西安市1990～2007年耕地变化相关统计数据,对该市近年的单一土地利用类型动态度和区域耕地相对变化率2个指标进行测算,揭示该市耕地变化的时空特征;接着,采用主成分分析法对该市耕地资源变化主要驱动因素进行定量分析,建立了耕地变化的驱动模型。结果表明,西安市耕地变化总体呈现较快减少的趋势;耕地变化的主要驱动力主要来源于社会经济发展的推动和农业产出的影响2个方面。

The related statistical data of cultivated land from 1990 - 2007 in Xian City was used. The single dynamic degree and relative change rate of land use were estimated to reflect the space-time changes in Xian City of farmland. A quantity study was made by using principal component analysis for the changes ,and a linear regression model was made. The analytical results indicated the changing tend in Xian City of farmland showed faster decrease. The cultivated land reduction driving force rooted in 2 aspects, such as the social and economic factor and agricultural output.