烤烟烟碱含量与土壤有机质、氮素含量的关系分析

分析了湖南烟区222个烤烟样品烟碱含量与土壤有机质、全氮和碱解氮之间的关系。结果表明：（1）烤烟烟碱含量在不同等级间存在较大的变异，总体呈现出B2F〉G3F〉X2F的趋势，平均烟碱含量为2．84％，变幅为0．58％～5．95％，变异系数为34．07％；（2）不同等级烟碱含量分别与土壤有机质、全氮和碱解氮的相关系数均达到1％的极显著水平；（3）采用聚类分析方法把同一等级烟叶样品的烟碱含量分为高、中、低3类，不同类别相比较，有机质含量越高的土壤，其土壤全氮、碱解氮以及相应的烟叶烟碱含量也越高，表明土壤有机质含量的高低，直接影响了土壤氮素的供应状况，进而影响了烟碱含量的积累。

Relationship between nicotine content in flue-cured tobacco leaf and contents of organic matter and nitrogen in soil

The relationship between the nicotine content in 222 flue-cured tobacco samples and organic matter,total N,available N in soil from Hunan tobacco-growing areas was analyzed.The results indicated that:(1) The nicotine content in flue-cured tobacco leaf showed a big variation among different grades,and showed the trend of B2F>C3F>X2F in total.The content of nicotine ranged from 0.58% to 5.95%,with mean of 2.84% and variation coefficient of 34.07%.(2) The correlation coefficients of the nicotine content among different grades and the three kinds of soil nutrients including organic matter,total N and available N were all significant at 0.01 level,respectively;and their corresponding regression equations were built.(3) Based on content of nicotine and by using cluster analysis method,the same grade tobacco samples could be divided into three groups of high,medium and low content with different levels.Comparing different clusters,the higher the soil organic matter was,the higher the soil total N,soil available N were,and corresponding content of nicotine was also.The result showed that the contents of soil organic matter affected the supply of the soil nitrogen elements and ulteriorly affected the accumulation of nicotine in tobacco leaf.