甘肃省粮食作物时空格局变化特征分析

以甘肃省14个市（州）粮食生产区域为单元尺度，对甘肃省三大类粮食作物小麦、玉米、马铃薯的时空格局变化特征进行分析，揭示区域内部粮食生产变化的异质性。结果表明，甘肃省粮食生产的地域性差异较大。粮食主产区呈现由西向东、由灌溉区向旱作区转移的态势。小麦播种面积直线递减，粮、经兼用的玉米、马铃薯播种面积上升。甘肃省粮食生产品种类型及区域结构变换更替明显，种植业比较收益高低是决定更替变换的主因。

Analysis on the Temporal and Spacial Characteristics of Pattern Grain Crop Productivity in Gansu Province

Based on the data of grain crop productivity in 14 districts of Gansu province, the spacial difference of the main three grain crop （i.e. wheat, maize and potato） had been discussed, to understand the heterogeneity of grain crop productivity of each.district in Gansu province. The results showed that the grain crop productivity was significantly differed in different districts in Gansu province, the main production region of grain crop productivity changed from west part to east part of Gansu province, as well as changed from irrigation area to rain-fed area. The planting area of wheat decreased sharply from 1991 to 2012, the maize and potato increased year by year. Consequently, the structure of grain crop and planting area changed significantly in the past 21 years, and the benefit of grain crop productivity is the main reason which drives this changing.