关键词: 河西走廊, 农业水热资源, 时空分布, 变化趋势

Abstract: Climate change has significant impact on agricultural water thermal resources. Evaluating its potential influence could provide scientific basis for formulating future regional agricultural development strategy. Based on the weather data of 13 meteorological stations in Hexi Corridor, this paper analyzed the temporal and spatial variation characteristics and trends of agro-climatic resources from 1960-2014. The results indicated that during the recent 55 a, the day of mean temperature over 0℃ advanced at the rate of 1.8 d/10 a, whereas mean temperature during crop growing period ≥10℃ accumulated temperature, and length of growing season showed a significant increasing trend, with the rates of 0.30 ℃/10 a, 77.1 ℃/10 a, and 2.8 d/10 a, respectively. The area with ≥10℃ accumulated temperature >3 000℃ and length of growing season >170 d had extended to the most part of the Shule River Basin, Heihe River Basin, and northern part of the Shiyang River Basin. The sunshine hour also showed an increased trend with a rate of 9.0 h/10 a. However, the precipitation, reference evapotranspiration, and humidity index did not show remarkable changing trend during crop growing period. The regional drought condition was unrelieved. In general, the changes of agro-climatic resources in Hexi Corridor were characterized as “increased air temperature, improved heat condition, and enhanced sunshine hour”. These changes were in favor of satisfying the heat conditions needed by crop growth and development, and providing possibility to expand the planting area of grain and oil crops, and to apply sequential cropping of cereal and forage crops in Hexi Corridor.

Key words: Hexi Corridor, agricultural water and thermal resources, spatial-temporal distribution, variation trend