气候变暖对甘肃夏秋季作物种植结构的影响

Impact of Climate Warming on Summer-Autumn Crop Planting Structure in Gansu Province

采用≥0℃、≥10℃积温和<0℃负积温与冬小麦、春小麦、玉米种植面积对比分析.结果表明:陇中旱作区<0℃负积温与冬小麦种植面积为显著正相关、与春小麦种植面积为显著负相关;≥0℃积温与河西灌溉区春小麦和陇东南旱作区冬小麦种植面积为较显著负相关;≥10℃积温与河西和河东玉米种植面积为显著正相关.气候变暖使陇中冬小麦种植面积迅速扩大、春小麦种植面积减少;陇东南冬小麦和河西春小麦种植面积减少;甘肃省玉米种植面积迅速扩大,夏秋作物种植结构发生显著改变.

By analyzing the data of accumulative temperatures of above and below 0 ℃ and above 10 ℃ and planting areas of winter and spring wheat and corn, it is found that, in the dry farmland of middle Gansu province, the correlation between the accumulative temperature below 0 ℃ and planting area of winter wheat is significantly positive, but that between the accumulative temperature below 0 ℃ and planting area of spring wheat is significantly negative. The relation exhibits a significantly negative correlation between the accu- mulative temperature above 0℃and the areas of irrigated spring wheat in Hexi and non-irrigated winter wheat in Southeast Gansu province. However, the relation exhibits a significantly positive correlation between accumulative temperature above 10 ℃ and the areas of maize in Hexi and Hedong. The area of winter wheat has expanded with climate warming, but the area of spring wheat has decreased in the middle Gansu province. The areas of winter wheat in the southeast Gansu province and spring wheat have reduced. Planting areas of corns have expanded rapidly in Gansu. Pronounced change of crops planting structure in summer-autumn can be seen.