In order to find out the variation law of chemical compositions in flue-cured tobacco leaves in Malong area,the tobacco samples were collected during 2012 to 2014 from Maming,Wangjiazhuang and Jiuxian Towns,and 270 samples were collected in each year and each town.The main chemical components of tobacco leaves and their change trend were analyzed.The results were as follows:The contents of nicotine and Cl in the leaves of flue-cured tobacco in Malong were relatively suitable.The potassium content of some samples was relatively low.The total sugar and reducing sugar of some samples were relatively high.The potassium content was relatively stable over the years.The total sugar content and the ratio of nitrogen to nicotine showed an upward trend.The total nitrogen and nicotine contents showed downward trends.The chemical components in different parts had significant difference.The total sugar and reducing sugar in tobacco leaves form Jiuxian were significantly higher than those from the other two areas,and those from Maming area was relatively lower,but those of Wangjiazhuang had better stability.%为探明马龙烤烟烟叶化学成分变化规律,于2012-2014年在马鸣、旧县、王家庄共3个乡镇采集烟叶样品,每年每个乡镇采集270个,连续3年,分析烟叶样品主要化学成分并进行了变化趋势分析.结果表明:马龙烤烟烟叶烟碱和氯含量相对适宜,部分样品钾含量相对较低,部分样品总糖、还原糖相对较高;钾含量在不同年份间相对稳定,烟叶总糖含量、氮碱比呈上升趋势,总氮和烟碱呈下降趋势;不同部位间化学成分呈显著差异;总糖、还原糖旧县烟区显著高于其他两个烟区,马鸣烟区较低,但王家庄稳定性较好.
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