《Table 1 Changing trends of climate factors during the entire growth period of maize in different re

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《气候变化背景下1981-2010年中国玉米物候变化时空分异（英文）》

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Note:“+”and“-”indicate that the climate factor increased or decreased，**and*indicate significance levels at 0.01 or0.05 respectively.

The spatial distribution of the trends in average air temperature，precipitation，sunshine duration，and GDD changes during maize growing season at each selected site from 1981 to2010 is shown in Figure 2.Throughout the country，average air temperature and GDD increased from 1981 to 2010 by 0.03°C/yr and 4.92°C d/yr，respectively.Precipitation and sunshine duration showed decreasing trends，and the decrease rates were–0.16 mm/yr and–2.07 h/yr，respectively（Table 1）.Average air temperature and GDD showed increasing trends at 90%and 83%of the selected sites，respectively，and the increase in air temperature was greater at high than at low latitudes.