Abstract:

Based on daily meteorological records of mean, minimum and maximum air temperatures, sunshine hours as well as precipitation from more than 97stations from 1961 to 2008 across Hunan province, we employ the best small grid interpolating methods to develop the high-resolution grid series data with the grid distance of 500 m. Based on the main crops growth conditions and regionalization research results of double cropping rice, rape, cotton, satsuma mandarin, sweet orange, pummelo, camellia oleifera, tobacco, we establish the corresponding indexes of climatic regionalization for main crops suitability. Combined with the geographic information data and based on GIS, we carry out the work of dynamic climatic regionalization for main crops planting suitability. The results show that the climate change has some influences on the planting structure of main crops in Hunan province. The major impact on double cropping rice is the change of ripe cycle, onrape and camellia oleifera as well asorange is the increased area of optimum suitable planting, on cotton and tobacco is the decreased area of optimum suitable planting. According to the impacts of climate change on planting structure and the results of agricultural climatic regionalization, we propose as follows: make full use of climate resources of lakeshore plain and valley plain as well as basin to raise multiple crop index, and to increase the yield per unit area; make full use of mountain climate resources to make the camellia oleifera industry bigger and stronger; make full use of regional climate resources to create the orange brand; make full use of microclimatic resource to develop the special tobacco planting in western and southern Hunan province