采用对农作物生长有指标意义的≥10℃积温和<0℃负积温与农作物适宜种植面积、生长发育速度及产量进行对比统计分析研究,指出气候变暖对中国西北地区农作物种植结构发生了较大改变,冬小麦种植区西伸北扩,棉花面积迅速扩大,多熟制向北和高海拔地区推移。农作物生长发育速度发生了明显变化,春播作物提早播种,喜温作物生育期延长,越冬作物推迟播种,生育期缩短。棉花气候产量明显增加。 Based on the statistic analysis and comparison of negative accumulated temperature (≥10 ℃) and negative accumulated temperature (≤0 ℃) with the index significance of crop growth, it is pointed out that the climate change has a great effect on crop planting structure in Northwest China. Change, the winter wheat planting area extends northward expansion, cotton area expanded rapidly, multi-cooked northward and high altitude area. Crop growth and development rates have changed significantly, early sowing of spring sowing crops, extending the growing stage of hi-temperature crops, sowing overwintering crops and shortening the growth period. Cotton climate output increased significantly.