Climate Cluster Analysis of the Tobacco Planting Zone in Yunnan

[Objective] The research aimed to study clusters of the six climatic factors in Yunnan tobacco planting zone.[Method] 6 meteorological elements in 89 tobacco-growing counties and 12 prefectures were conducted cluster analysis.According to indicator and climate characteristics of the each type,climate in tobacco planting area of Yunnan Province was divided.[Result] Climate could be divided into eight types: Jiangchuan(24 counties,belonged to northern and central subtropical climates),Songming(27 counties,belonged to northern subtropical and central,southern,northern warm climates),Tengchong(3 counties,belonged to northern subtropical climate),Mile(12 counties,belonged to central and south subtropical climates),Qiubei(11 counties,belonged to south subtropical climate),Yanjin(4 counties,belonged to central subtropical humid climate),Yuanjiang(4 counties,belonged to southern subtropical and north tropical climates),Zhenxiong(3 counties,belonged to warm and northern subtropical climates) as the representative.Among 1-8 eco-zones,domestic and foreign cities that climate reached one-level similarity were respectively 3,1,1,0,1,1,0 and 1,up to two-level similar,respectively 12,15,3,13,13,1,5 and 3.Among 8 major ecological zones,similar distance of the one-level similarity city was in the range of 0.28 to 0.45,and similar degree was the highest.Variety introduction between these places would be successful.Similar distance of the two-level similarity city was between 0.51 and 1.00,and similar degree was higher.Mutual variety introduction had high success rate in these places.[Conclusion] The research provided theoretical basis for selecting new suitable tobacco variety and optimizing tobacco variety layout in different zones.