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分析了东北地区１９５１～１９９４年作物生长季（５～９月）旬平均气温变化及其对粮食产量的影响，结果表明，作物生长季气温变化有明显的增暖趋势，主要表现在８０年代以后，其增温幅度小于年平均气温升温幅度。通过气温变化与粮食产量关系及作物生育关键期气温的变化对产量贡献的分析，进一步阐明东北地区气温升高有利于粮食增产。
The change of average temperature and its effect on grain yield in the crop growing season (May-September) from 1951 to 1994 in Northeast China were analyzed. The results showed that there was a clear warming trend in the temperature during crop growing season, mainly manifested in the 1980s , The warming rate is less than the annual average temperature warming rate. Based on the analysis of the relationship between temperature changes and grain yield and the change of temperature during the critical period of crop growth on the yield, it is further clarified that the increase of temperature in northeast China is favorable to the increase of grain output.