Abstract:

In order to reveal the variation characteristics for Hunan agricultural climate resources on the background of global climate change, the meteorological data of 97 observation stations from 1960 to 2010 in Hunan Province which had been treated by homogeneity test and correction was used to analyze the temporal and spatial tendency, differences of agricultural climate resources. The results showed that warming was the main characteristics of climate change in Hunan which was consistent with the global, accordingly, heat resources of Hunan presented a significant upward trend, especially the active accumulated temperature. The linear trend of precipitation in Hunan was not significant, but presented seasonal and regional differences, in winter the significant upward trend of precipitation was presented in northern areas of the Hunan Province, and in summer it was presented in central region；in spring the significant downward trend of precipitation was presented in western areas, and in summer it was presented in central region. Sunshine hours presented a significant downward trend especially in summer, and the largest decrease magnitudes presented in the middle and lower reaches of Xiangjiang River. Climate change caused the change of agricultural climate resource, thereby affecting layout and structure of agricultural production and crop planting. Reasonable utilization of climate resources and improvement on the ability of agricultural adaptation to climate change will be needed in future.