摘要
In this study, the relationship between major meteorological factors and tobacco chemical components in different altitudes of Yongde County, Lincang Region of Yunnan Province was studied using correlation analysis and path analysis methods.The results showed that there was a difference on meteorological factors in different altitudes, causing different impacts on chemical components of flue-cured tobacco; contents of nicotine and total nitrogen decreased with the rising of altitude, conversely, total sugar and reducing sugar contents increased with the rising trend of altitude, and the differences on the contents of potassium (K) and chlorine(CI), and the ratio of K to CI in different altitudes were not significant, at the altitude of 1 250-1 450 m, each chemical component indicator was better. The correlation between main meteorological factors and conventional chemical components of tobacco leaves was as follows: contents of reducing sugar and total sugar increased with the increase of rainfall and relative humidity, and decreased with the increase of sunshine duration; nicotine content increased with the increase of accumulated temperature and sunshine duration; total nitrogen (N) content increased with the increase of daily mean temperature and accumulated temperature; sugar-alkali ratio increased with the increase of rainfall. Path analysis showed that the direct effect of sunshine duration on reducing sugar and total sugar of tobacco leaves was faint, but the indirect effect was obvious; meanwhile, the direct and indirect effects of it on nicotine and total N were the greatest.
运用相关分析和通径分析方法,对云南省临沧永德县不同海拔高度主要气象因子与烟叶常规化学成分含量的关系进行了研究。结果表明,不同海拔高度的气象因子存在差异,对烤烟的常规化学成分产生不同影响;烟碱和总氮随着海拔升高而减少,总糖和还原糖随海拔高度升高呈现上升趋势,钾和氯的含量、以及钾氯比不同海拔高度间差异不显著,各化学成分指标在海拔1 250-1 450 m处表现较佳。主要气象因子与烟叶常规化学成分的相关性为:还原糖、总糖随降雨量和相对湿度增加而增加,随日照时数增加而减少;烟碱随积温、日照时数增加而增加;总氮随日均温、积温增加而增加;糖碱比随降雨量增加而增加。通径分析表明:日照时数对烟叶的还原糖、总糖直接影响较小,而间接影响较大;对烟碱、总氮的直接和间接影响均最大。