中国粮食生产区域差异的多尺度分析

Multi-Scale Analysis of Regional Differences of Grain Production in China

文章运用标准差指数、变差系数、空间自相关等分析方法对中国粮食生产的区域差异及其空间格局进行了多尺度分析。研究表明:12001—2011年间中国粮食生产的区域差异在不同尺度上均呈现出总体扩大的趋势,但是各尺度差异扩大的程度不同,依次为地带、地级、省级。中国粮食生产在省级与地级尺度上均呈现出空间集聚特征,并且尺度越小,空间集聚特征表现得越强。2省级与地级尺度空间关联类型均以正相关为主,各空间关联类型在数量分布上差异明显,分布格局上也略有不同。省级与地级尺度热、冷点地区在空间格局上同样存在着局部差异。3大尺度的分析无法详尽地反映小尺度的空间格局,与大尺度相比,小尺度在空间分析上能更详尽地揭示我国粮食生产区域差异的空间格局。

With standard deviation index, the coefficient of variation, the method of spatial autocorrelation, this paper analyzes the regional differences and its spatial framework of grain production on multi-scale angle, the results shows： ①The regional gap of grain production tends to widen on each level, while the gap varies on different level, the largest is zone level, followed by prefecture and province level. The grain production shows the signs of spatial agglomeration on both province and prefecture level and the smaller the scale is, the more obvious the agglomeration tends to be. ②The spatial correlation tends to be mostly positive on both province and prefecture scale, with various amounts and distribution patterns on spatial correlation types. The spatial differences also exist on province and prefecture Getis-Ord Gi＊values. ③ The analysis on larger scale fails to show the spatial framework of smaller scale, thus the analysis on relatively smaller scale would better illustrate the framework of regional differences of grain production in China.