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中文摘要：
气候变化对农业生产的影响是全球变化研究中的焦点问题之一，松嫩平原是我国重要的农业区，研究过去的气候变化对其作物产量的影响具有重要的现实意义。本文选取松嫩平原玉米带为典型区，进行过去气候变化对作物产量影响的实证研究。借鉴相关研究成果，首先确立基准时段，进而建立气温影响系数，来表征气温对玉米单产的影响程度，从而分析过去气候变暖对松嫩平原玉米带玉米单产增加／减少的贡献率。结果表明．20世纪90年代作物生育期气温条件与以前相比已经发生了显著改变。如果以1961—1969年为基准时段，则相对于20世纪60年代、70年代和80年代，90年代的气候变暖对玉米增产的贡献率分别为3．55％、5．86％和9．48％。如果以1970—1982年为基准时段，则20世纪90年代气候变暖对玉米增产的贡献率相对于70年代和80年代分别为17．98％和26．78％。
英文摘要：
Effect of climate change on agriculture is one of focuses in terms of global change researches. It is of significance to study the impacts of climate change on crop productivity in past years, in Songnen Plain, one of important agricultural zones. This research selected the corn belt of Songnen Plain as typical zone, to conduct the case study on response of crop productivity to climatic change. First, the referenced period was selected and the temperature - affecting coefficient was built to analyze the contribution of climate warming to maize yield. We found that, if the period 1961 -1969 was selected as referenced period, then the contribution of climate warming to maize yield increasing in 1990s was 3.55% ,5.86% and 9.48%, than 1960s, 1970s and 1980s, respectively. If the period I970 - 1982 was used as referenced period, the contribution of climatic warming to yield increasing in 1990s was 17.98% and 32.78%, than 1970s and 1980s, respectively.
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