Analysis of the Climate Characteristics during Field Growth Period of Tobacco in Producing Areas of the Typical Strong Flavor Type Tobacco Leaves in Xiangnan

In order to reveal the ecological factors that are closely related to the style features of the typical strong flavor type flue-cured tobacco in Xiangnan, we analyzed the climate change characteristics during tobacco growing period of Xiangnan tobacco cultivation areas with a nonlinear polynomial regression method using meteorological data in Guiyang and Jianghua tobacco areas from 1981 to 2010. The results showed that (1) The temperature at the rooting stage of Guiyang and Jianghua districts was below 15℃, daylight time was less than 4 hours, and daily precipitation kept rising, showing the climate feature of less light with more rain and low temperature. Moreover, the feature of low temperature and less light at transplanting and rooting stages was the main limiting factor that affected the style characteristic of the typical strong flavor tobacco leaves of Xiangnan. (2) The highest temperature at maturity stage of Guiyang and Jianghua area was respectively 29.27℃ and 28.35℃, and as daylight time continued increaing after late June, the temperature difference increased greatly, while the rainfall reduced, so did the relative air humidity, showing the climate feature of more light with less rain, high temperature and low humidity. Moreover, the feature of high temperature at the maturity stage contributed to the major limiting factor that affected the style characteristic of the typical strong flavor tobacco leaves of Xiangnan. Southwest monsoon and local fohn at maturity stages were also believed to be the meteorological factors that affected style characteristics reveal of the typical strong flavor tobacco leaves in Xiangnan areas.