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Impact of Climate Warming on Agriculture in Gansu Province

LIU Dexiang1,2, DONG Anxiang2, ZHANG Pinglan1, FEI Xiaoling1(1. Lanzhou Center Meteorological Observatory, Gansu 730020,China; 2. Key Laboratory of Arid Climatic Variation and Disaster Reduction, Lanzhou Arid Meteorological Institute, Chinese Meteorological Administration, Gansu 730020,China; 3.Gansu Meteorological Network Information Center, Gansu 730020,China)  
Based on temperatures of 171 observations from 1961 to 2003 in Gansu province, the year mean temperature, highest temperature, lowest temperature, accumulated temperature above 0℃,10℃, and negative accumulated temperature beneath 0℃ were collected to analyze. The results showed that year mean temperature of 1987~2003 was significantly higher than that of 1961~1986; especially the lowest temperature increment appeared markedly. The lowest temperature rising played a main effect on climate warming in Gansu province. Climate warming was more clearly in winter than in summer. The accumulated negative temperature reduced obviously. As the trends of climate changing has shown warming since late 1980s in Gansu province,thermal resource is increased, planting areas of heliophilous plants are expanded, the northern planting boundary of crop spreads further to north and it is beneficial to winter and spring animal. However, because of lack of water resources, Impacts of climate warming on agriculture is more negative then positive.
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