The features of the climate adaptability about Camellia oleifera planting in hilly red soil region of southern China: a case study of Changning City Hunan Province
Camellia oleifera is unique woody edible oil tree species in southern China. It has attracted pretty attention. Taking Changning City of Hunan Province as an example, we have analyzed the features of the climate adaptability of Camellia planting in hilly red soil region of southern China. TOPSIS method based on entropy weight has been adopted in the paper. The results show that the weight of the annual average temperature is 0.1538,and the weight of SigmaT≥ 10℃ is 0.1532. They are the first and the second driving factors, hence the warm climate is the main driving factor of adaptability of planting Camellia. The entropy of polar outbreak is the maximum of 0.1750 in 5 coercive indicators, and it is the maximum in all of the evaluation indexes. Polar outbreak limits the climate adaptability of Camellia oleifera, and polar outbreak is the main restrict factor of the adaptability. The climate adaptability of Camellia oleifera planting attributes medium grade in the mass in Changning City. The adaptability has obvious volatility in interannual variation. The fluctuation change is closely related to the air temperature. The fluctuations can be divided into 3 periods from 1991 to 2008. The maximum values ot optimal closeness and the average show an increasing trend as the periods go on. The climate adaptability of Camellia oleifera planting is on the increase as the years go on.