[Objective] The purpose was to learn about the stalk position characters of chemical components in the tobacco leaves from different producing areas of Shaoyang. [Method] The tobacco samples were collected from Shaoyang, Longhui and Xinning counties and the stalk position characters of their chemical components were studied through experimental detection and calculation. [Result] The contents of reducing sugar in the tobacco leaves of different stalk positions from the same producing area had significant difference. The stalk position characters of the contents of total nitrogen, potassium and petroleum ether extract in the tobacco leaves from 3 producing areas were upper leaves ＞ lower leaves ＞ middle leaves, lower leaves ＞ middle leaves ＞ upper leaves and upper leaves ＞ middle leaves ＞ lower leaves resp. The difference of nicotine content between the upper leaves and the middle leaves of Xinning and Longhui were 2.12% and 1.28% resp. All the variation coefficients of nicotine content in the lower leaves from 3 producing areas were above 0.25 and their average variation coefficient of upper leaves was 0.17. The chlorine contents in the tobacco leaves from all the 3 producing areas did not exceed the standard and were relatively low. The contents of volatile base in the lower leaves from 3 producing areas were stably lower than that in the middle and upper leaves. The stalk position characters of sugar/base and nitrogen/base ratios in the tobacco leaves from 3 producing areas were lower leaves ＞ middle leaves ＞ upper leaves. [Conclusion] The chemical components in the tobacco leaves from various tobacco producing areas of Shaoyang City had relatively obvious stalk position characters.%[目的] 了解邵阳不同产地烟叶化学成分的部位特征.[方法] 烟叶样品采自邵阳县、隆回县和新宁县,通过试验测定和计算研究了其化学成分的部位特征.[结果] 同一产地不同部位烟叶的还原糖含量差异显著.3产地烟叶总氮、钾和石油醚提物含量的部位特征分别为:上部叶＞下部叶＞中部叶、下部叶＞中部叶＞上部叶和上部叶＞中部叶＞下部叶.新宁和隆回上部叶与中部叶的烟碱含量分别相差2.12%和1.28%.3产区下部叶烟碱含量的变异系数均在0.25以上,上部叶的平均变异系数为0.17.3产区烟叶的氯含量均未超标,且相对偏低.3产区下部叶的挥发碱含量稳定性低于中上部.3产区烟叶的糖/碱值和氮/碱值的部位特征均为:下部叶＞中部叶＞上部叶.[结论] 邵阳市各烟区烟叶的化学成分具有比较明显的部位特征.
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