基于探索性空间数据分析的贵州省耕地质量空间差异

Spatial Difference of Farmland Quality Based on Exploratory Spatial Data Analysis in Guizhou

为贵州耕地质量空间分布的合理判断及耕地质量保护提供科学依据,依托GIS空间分析技术,基于贵州省1989—2010年耕地数据,应用探索性空间数据分析(ESDA)方法对全省耕地质量进行空间全局和局域Global Moran’s I分析,以探明全省耕地质量空间差异分布规律及特征。结果表明:通过全局空间自相关分析,贵州省总体上在1989—2010年优等地表现出较为显著的空间差异,高等地、中等地和低等地的空间差异较小;通过局域空间自相关分析,贵州省大部分区县耕地质量都表现为正的空间相关性,HH类型在毕节地区和遵义地区表现最为活跃,HL类型表现不显著,毕节的优等地及贵阳、贵定、凯里的高等地有此类型;LH类型分布较广且比较分散,主要分布于六盘水等地区,贵州的东部、中部、东北方向、东南方向及西南方向有此类型,全省耕地质量在局域空间自相关上存在一定的空间差异性。

The spatial overall and local Global Moran＇s I values of farmland quality were analyzed by using ESDA based on GIS spatial analysis technology and the farmland data in Guizhou during 1989--2010 to explore the spatial difference distribution regulation and characteristics of farmland quality and provide the scientific basis for rational judgment of farmland quality spatial distribution and protection of farmland quality. Results： There is a significant spatial difference in highest-class farmland and there are less difference in higher-class, moderate-class and low-class farmland overall by overall spatial auto-correlation analysis. The local spatial auto-correlation analysis shows that the farmland quality of most counties （regions） presents a positive spatial correlation, The HH type distributes in Bijie and Zunyi Prefecture mainly. There is the HL type in highest-class farmland of Bijie Prefecture and higher-class farmland of Guiyang, Guiding and Kaili. The LH type distributes in Liupanshui, eastern, Central, Northeastward, Southeastward and Southwestward of Guizhou mainly. There is a certain spatial difference in farmland quality on local spatial auto-correlation in Guizhou.