玉溪烟区气象因子对烟叶氯含量的影响

Effects of Meteorological Factors on Chlorine Content of Tobacco Leaves in Yuxi Tobacco Growing Area

为探究气象因子对玉溪烟区烤烟氯含量的影响,运用描述统计、简单相关分析和曲线回归分析方法研究了玉溪市中部烟叶氯含量与所对应气象因子之间的关系。结果表明:玉溪烟区除成熟期降水量偏多、日照时数偏少外,其余各生育时期降水量、气温日较差和相对湿度等均符合优质烟叶对气象因子的要求;烟叶氯含量与6月中旬降水量极显著正相关,与成熟前中期降水量、成熟中后期降水量、成熟期降水量、大田期降水量极显著负相关;在一定范围内,烟叶氯含量随移栽伸根期相对湿度和成熟期气温日较差的增加而升高;成熟期相对湿度、成熟中后期日照时数、旺长期降水量对烟叶氯含量的影响较小,相关性均未达到显著水平。这表明烤烟成熟期气象因子对烟叶氯含量影响较大,降水量是影响烟叶氯含量的关键气象因子。

To know the influence of meteorological factors on chlorine content of tobacco leaves,the correlation between chlorine contents of 182 middle tobacco samples(C3F)from Yuxi tobacco-growing area and local meteorological factors at corresponding growth stage was studied by the methods of descriptive statistics,simple correlation analysis and curvilinear regression analysis.The results showed that except for more rainfall and less sunshine hours in the mature period,the rainfall,daily temperature range and relative humidity at all other periods were suitable for producing high-quality tobacco leaves.The chlorine content of tobacco leaves had an extremely significantly positive correlation with the rainfall in mid-June,but an extremely significantly negative correlation with the rainfall in the mature period(i.e.,the early-middle,middle-later and whole periods of maturity),and in the whole field period in this area.The chlorine content increased with the rising of the relative humidity in the root-extending stage after transplanting and daily temperature range in the mature stage.The relative humidity in the mature stage,sunshine hours in the middle-late stage of maturity,and rainfall in the flourishing period had low influences on chlorine content of tobacco leaves,not reaching significant levels.That demonstrated meteorological factors in the maturity period had great influence on tobacco leaf chlorine content,especially rainfall was the key meteorological factor affecting tobacco leaf chlorine content.