甘肃干旱半干旱地区农业气候特征分析

An Analysis of Agroclimatic Characteristics in the Arid and Semiarid Areas in Gansu Province

根据甘肃干旱半干旱地区１９５１～１９９０年的光能、气温、降水和风等资料分析，得出其主要气候特征是光能资源丰富，冬冷夏暖、昼夜温差大、无霜期短、积温较少，降水少、变率大、年内分配不匀、土壤蒸散强烈、风多风大、水热光组合失调等，并较详细地评述了这些气候特征对农业生产的利弊影响。

Based on the analysis of data of solar energy,temperature,precipitationand wind in the arid and semiarid areas in gansu Province during the years of l951～1990,we have come to the conclusion that the major agroclimate is characterized by theplenty of light resources,cold in winter and warm temperate in summer,great diurnaltemperature,short frost-free period,less accumulative temperature,less rainfall withuneven yearly distribution,stronger evaporation and evaportranspiration,mor andstrong winds and imbalance of combination of water,heat and light.Also,this paperdeals with the advantageous and disadvantageous effects of the agroclimatic characteris-tics upon agroproduction.