Abstract:
Based on temperature data from 1961 to 2010 of 7 meteorological stations and semilate rice phonological data from 1991 to 2010 of 3 agrometeorological experimental stations in Shiyan, the interannual and interdecadal correlations were investigated between temperature changes and rice growth stage in Shiyan area. The results show that the annual average temperature increased from the mid-1980s, and this trend was accelerated after the 1990s. Temperature increased significantly from April to May during the rice growing season, resulting in rice transplanting date advancing. From April to September, the upward trend of minimum temperature is also significant, but in other months warming trend was not obvious. Sowing to transplanting period length showed a significant shortening, while transplanting to heading showed an extension of the trend, which benefited the formation for large spike and yield improvement. Rice yield per unit area with the average and maximum August-September temperatures showed significant positive correlation.