Climate Suitability of Rice and Its Changes in Huaihe Watershed
The interannual change of the sunshine suitability, the precipitation suitability and the climate suitability of rice in 40 counties of Huaihe Watershed are decreasing every year. The article analyzes the difference of the sunshine suitability, the precipitation suitability and the temperature suitability of rice in Huaihe Watershed, then divides Huaihe Watershed into three sub-regions: the highest suitability region, the suitability region, the low suitability region. Synthesizing the factors of temperature, sunshine and precipitation, the four types of climatic suitability of rice in Huaihe Watershed are divided: the north watershed highest suitability region, the south watershed highest suitability region, the central watershed suitability region, the northwest mountainous area low suitability region. Then the article analyses the interannual climate suitability change of rice at these regions. The result shows that the climate suitabilities of rice at these regions are decreasing gradually.