关键词: 黑龙江省, 气候变暖, 气温影响系数, 玉米单产, Heilongjiang Province, climate warming, temperature influence coefficient, maize yield

Abstract: Heilongjiang Province is one of major maize production bases for China. The maize yield fluctuation is closely linked with the country food security. Therefore, it is of significance to study the influence of climate warming on maize yields in this region under the background of climate warming. Based on the daily meteorological data of 22 weather stations and the maize yields of the main counties in 1961-2008 in Heilongjiang Province, the influence of climate warming on maize yield was carried out. The reference period was selected and the temperature influence coefficient was built. The results indicate: in the recent 50 years, the climate warming was favourable to the increasing tendency of maize yield. If 1961-1969 is used as the reference period, the contribution of climate warming to the maize yield in the 1970s, 1980s, 1990s and 2001-2008 is respectively 16.8%, 16.0%, 20.9% and 23.9%, relative to that of the 1960s. If 1970-1983 is used as the reference period, then the contribution of climate warming to the maize yield in the 1980s, 1990s and 2001-2008 is respectively 3.6%, 8.2% and 11.2% , relative to that of the1970s.