关键词: 气候变暖, 积温, 适应对策, 综合效应

Abstract: Since 1980s,climate change has great impacted agriculture production in northeast China.On the one hand,more heat resources in crop growing season increased the grain yields;on the other hand,human adaptation measures to climate change not only make full use of heat resources,but also increase the effective accumulated temperature and promote the crop production.Taking maize in Jilin Province as an example,the increase trend in heat during crop growth period in Jilin under the condition of climatic warming in recent 30 years from 1976 to 2005 were analyzed.Three adaptation measures,including film-mulching cultivation,mechanical sowing,rational fertilization were studied,and various measures of the effect of improving temperature and shorten growth period were equated into accumulated temperature.The results showed that human adaptation measures made great contribution on grain yield increasing.Taking the man-made thermal effects to climate change as object,it showed that more objective and scientific to assess the impacts of climate change and scientific-technological progress on the agricultural development,as well as to further develop the potential of agricultural production.

Key words: Climate warming, Accumulated temperature, Adaptation measures, Comprehensive effect