摘要
本文采用偏最小二乘回归和灰色关联度分析方法,以克服烟叶化学成分指标间线性相关性的干扰,研究了四川烟区烟叶化学成分与纬度的关系,为四川烟叶种植适宜区的选择提供参考。结果表明：四川烟区的纬度跨度为N26°02′~N31°20′;四川烟区烟叶化学成分总体上表现为：总糖和还原糖偏高,淀粉含量略微偏高,氯含量偏低,烟碱、总氮和钾含量处于较适宜范围内,且烟碱、氯和淀粉的变异系数较大;烟叶化学成分与纬度的偏最小二乘回归分析模型如下：上部叶（纬度=28.762 0.146x1 0.214x2 0.005 23x3 0.172x4＋0.316x5 0.232x6 0.046 4x7）、中部叶（纬度=28.762 0.117x1 0.088x2＋0.009 9x3 0.127x4＋0.288x5 0.328x6 0.041 3x7）、下部叶（纬度=28.762 0.026x1 0.123x2＋0.25x3＋0.010 3x4＋0.271x5 0.237x6 0.136x7）,其中x1~x7分别代表总糖、还原糖、烟碱、总氮、钾、氯和淀粉。烟叶化学成分与纬度的相关性强弱分析显示,同一部位间,烟叶中钾含量呈高度正相关,总糖、还原糖和氯含量与纬度呈高度负相关,即随着纬度的升高（从川南到川北）,烟叶中钾含量呈增加趋势,而总糖、还原糖和氯含量呈现降低趋势;不同部位间,烟碱、总氮和淀粉与纬度的相关性强弱表现的不一致;化学成分各项指标与纬度的关联序为：还原糖〉总糖〉总氮〉钾〉淀粉〉烟碱〉氯。
The growth, development and quality of flue-cured tobacco are influenced by main geographic factor of latitude. The correlations of tobacco leaf chemical content and latitude in the Sichuan Tobacco Region （STR） were analyzed in this study. The aim of the study was to determine the best latitude range for tobacco cultivation, provide a reference for tobacco production layout and allocation in the region. Partial least squares （PLS） regression, for dealing with 7 chemical indicators with internal linear correlation, and grey relational analysis were used to determine the relationships between leaf chemical compositions of flue-cured tobacco and latitude in the STR. The study analyzed 243 cured leaf samples collected respectively from the upper （14-16 leaf-position）, middle （8-12 leaf-position） and lower （4,-6 leaf-position） tobacco leaf positions at 153 monitoring points in four latitude regions （Panzhihua, Liangshan, Luzhou and Dazhou） of the STR in 2010. The results showed that Sichuan tobacco performed best in the latitude range of N26~02＇-N31~20＇. The overall chemical compositions of STR tobacco leaf showed that total sugar and reducing sugar were marginally in the highest amount, followed by starch and chlorine. The contents of nicotine, total nitrogen and potassium Were in suitable range with higher variation coefficient of nicotine, chlorine and starch. PLS regression model of chemical composition in relation to upper tobacco leaf and latitude was latitude=28.762-0.146Xx-0.214x2-0.005 23x3-0.172x4＋0.316xs-0.232x6-0.046 4x7; that for middle tobacco leaf was latitude=28.762-0.117xr0.088x2＋0.009 9x3-0.127xa＋0.288xs-0.328x6-0.041 3x7; and that for lower tobacco leaf was latitude = 28.762-0.026xl-0.123xz＋0.25x3＋0.OlO 3x4＋0.271xs-0.237x6-0.136x7 x-x-7 respectively denoted total sugar, reducing sugar, nicotine, total nitrogen, potassium, chlorine and starch contents. Correlation analysis showed that for the same position leaves, latitude was positively correlated with potassium, but negatively correlated with total sugar, reducing sugar and chlorine contents. It meant that increment of latitude across Sichuan form south to north increased tobacco leaf potassium content and decreased total sugar, reducing sugar and chlorine contents. For different position leaves, however, correlations between latitude and nicotine, total nitrogen and starch were inconsistent. The correlation sequence for chemical compositions and latitude was as follows： reducing sugar 〉 total sugar 〉 total nitrogen 〉 potassium 〉 starch 〉 nicotine 〉 chlorine.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2012年第11期1494-1499,共6页
Chinese Journal of Eco-Agriculture
基金
国家烟草专卖局项目(110200401003)资助
关键词
烤烟
纬度
四川烟区
化学成分
偏最小二乘回归
灰色关联度
Flue-cured tobacco, Latitude, Sichuan Tobacco Grey relation Region, Chemical composition, Partial least squares regression,
