Analysis On Relafivity Between Climate Factors And Chemical Components Of Tobacco Leaves In Zhaotong Of Yunnan

In order to understand tobacco leaf specialty, an integrated investigation, which including the climate characters, tobacco leaf quality characters, main chemical components of tobacco leaf and climate factors was conducted in 15 points at different altitudes in Zhaotong city, and the correlation analysis was also carried out among two of them. The results are described as followings:1. Compared the results of the 15 typical regions with the indexes of tobacco production divisions in Yunnan, only the Huanghua region is located in the less favorable area because of the average temperature during tobacco growing period, the other 14 points are all located in the most favorable area or favorable area.2. By analyzing the 4 climate indexed of 15 regions, we found that the ecological climate in Zhaotong city is mainly influenced by altitude and rainfall. The most important factor is altitude. The climate abnormality at the same altitude is mainly affected by rainfall. Among the 15 typical regions, the climate impacted by rainfall in the three regions, such as Santao, Dazhai and Wufeng show abnormality. In the other 12 points, the average month temperature and accumulated temperature above 10℃are related to the extremely obvious altitude during growing period of tobacco the sunshine time is related to the extremely obvious altitude.3. The result of analyzing the chemical components of tobacco leaf in the 15 points shows that most of the tobacco leaves in Zhaotong city contain high sugar and nicotine. As the content of sugar is mainly influenced by climate, the difference of total sugar and reducing sugar content among the 15 regions is relatively large, while the difference of nicotine content is relatively small.4. By analyzing correlation between the main chemical components at the three parts of tobacco leaf and climate factors, we found that the main chemical components at the cutters have highly obvious relationship with climate factors, the sugar content and nitrogen chemical compound are related to the climate factors to certain degree. The content of the lower leaf has less obvious relationship with the climate factors and that of the upper leaf has the least.5. The total sugar and reducing sugar in cutters and lower leaf are directly related obvious and extremely obvious to altitude and the nicotine content in cutters is negatively related to it. The sugar contents of cutters and upper leaves are negatively related the obvious and extremely obvious to average temperature during growing period of tobacco, but directly related to the obvious and extremely obvious sunshine time. When the altitude becomes higher, the average temperature during growing period of tobacco decreased gradually, the sunshine time becomes longer. In higher altitude region, the sugar content in tobacco leaf is higher.6. In order to differentiate the tobacco quality characters, based on the cutters quality, the 15 typical areas can be divided into 4 types according to the altitudes. The first type is the areas whose altitude is below 1000m, such as Huanghua and Wufeng, belonging to low total sugar and low nicotine; the second type is the areas whose altitude is between 1100m-1599m, such as Dazhai, Mugan, Taoyuan, Dawan, Longtoushan and Santao, belonging to relatively low total sugar, middle-high nicotine; the third type is the areas whose altitude is between 1600-1960m, such as Wenpin, Qiaoshan, Yongfeng, Hualang, Longjie and Buga, belonging to relatively higher total sugar, middle-high nicotine content; the fourth type is the areas whose altitude is above 1960m, such as Beizhadian, belonging to high total sugar and middle nicotine.7. In the division of tobacco quality characters, there are three relatively special regions, such as Wufeng, Taoyuan and Hualang, because their differentiation has no relationship with altitude but mainly influenced by rainfall and nutrition in soil.