The purpose of this paper is to investigate overall differences, structural differences, and scale effects of cultivated land occupied by construction from the multi-scale analysis, namely, the township level, the county level and the prefecture level. The Gini coefficient and Scale variance are used in this article. And the data from 1990 to 2015 in Wuhan Metropolitan area are employed. The results show that: 1)Cultivated land occupied by construction is characterized by prominent spatial differences on three scales, and the difference at town scale is the largest, followed by the county scale, and that at the prefecture scale is smallest. The smaller the scale of analysis is, the greater the contribution to the spatial differences of cultivated land occupied by construction is. 2)When cultivated land occupied by construction is categorized into cultivated land occupied by urban construction, by rural residential land construction, and by industrial and traffic construction, three types of cultivated land occupied by construction are characterized as the similar scale effects. In particular, the smaller scale of analysis is, the stronger the spatial heterogeneity is.3)Compared to cultivated land occupied by rural residential land construction, the differences in cultivated land occupied by industrial and traffic constructions and by urban construction are significant, the contribution rates of which towards the overall differences took the dominate role in all three scales. In conclusion, the multi-scale analysis might be a better method used to reveal the spatial differentiation of the cultivated land occupied by construction. And in the study area, spatial regulation of cultivated land occupied by construction especially by urban construction and by industrial and traffic construction on the township scale should be enhanced and should conduct the spatial differentiation management, so as to protect and utilize cultivated land scientifically and rationally.%研究目的:分析建设占用耕地及其来源结构空间差异的多尺度特征.研究方法:采用基尼系数、尺度方差等方法,从市级、县级、乡镇三个尺度测度分析武汉城市圈1990—2015年建设占用耕地的空间差异、来源结构差异及其尺度作用特征.研究结果:(1)建设占用耕地在三个尺度上均存在空间差异,其中乡镇尺度空间差异最大,县级次之,市级尺度最小;尺度越低,对空间差异的贡献程度越高.(2)将建设占用耕地分为城镇建设占用耕地、农村居民点建设占用耕地、工业交通建设占用耕地的研究表明,三种来源结构的空间差异与整体差异基本相似,尺度水平越低,空间差异越大.(3)与农村居民点建设占用耕地相比,城镇建设占用耕地和工业交通建设占用耕地空间差异较为显著,对整体差异的贡献在三个尺度上均占主导.研究结论:多尺度研究能较好地分析建设占用耕地的空间差异特征,研究区须加强乡镇尺度尤其是城镇和工业交通建设占用耕地的空间管制,探索实施空间差别化管理,从而促进科学合理可持续地保护利用耕地.
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