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烤烟中部烟叶外观区域特征分布及其与外观品质和物理特性的关系

Regional characteristic distribution of middle leaves and its relationship with appearance quality and physical properties of flue-cured tobacco

  • 摘要: 为建立基于外观特征的烟叶产地快速识别方法,以中部初烤烟叶(C3F)为材料,采用量化赋分方法,分析了不同种植区烟叶外观区域特征指标分布状况及其与外观品质和物理特性的关系。结果表明:①种植区之间,黄淮和北方区烟叶的外观区域特征相似性较强,主要特征为底色偏微灰,厚度中等偏厚,柔韧性相对硬脆;西南和长江中上游区烟叶的相似性次之,主要特征为底色白,光泽度较鲜亮,叶面组织较细腻;东南区烟叶的主要特征为底色偏微红,光泽度相对较暗,叶面组织略粗糙。②同一种植区内各二级区烟叶的底色差异不显著,而蜡质感、柔韧性差异较大。③基于不同尺度的烟叶外观区域特征聚类结果一致,隶属相同种植区内的各二级区均可划分为同一类别。④烟叶外观区域特征指标与外观品质指标的相关性均较弱(色差除外),与厚度、叶面密度等物理特性指标的相关性较强。因此,利用烟叶外观区域特征指标识别烟叶产地具有可行性。

     

    Abstract: To develop a method for rapid recognition of the producing area of flue-cured tobacco based on its appearance characteristics, the distribution of appearance regional characteristics of cured middle leaf samples of grade C3F sampled from different planting areas were studied,and the relationships with the appearance quality and physical characteristic of flue-cured tobacco were analyzed by quantitative assignment method. The results showed that: 1) Leaves from Huanghuai and North planting areas were much similar in appearance regional characteristics, which displayed a slightly grey background color of leaves, moderate or thicker thickness and relatively hard and brittle flexibility. Leaves from Southwest and the upper and middle reaches of the Yangtze River planting areas were similar, having a white background color, relatively bright luster and relatively smooth leaf surface tissue. The background color of leaves from southeast planting areas was slightly red, leaf luster was relatively dark and leaf surface tissue was slightly rough. 2)The background color of leaves from the secondary areas in the same planting areas was not significantly different, while the difference of waxiness and flexibility was larger. 3) The cluster analysis based on different regional scales gave identical results, and the secondary areas in the same planting area were clustered in the same category. 4) The correlation of appearance regional characteristic with appearance quality (except for the index of color difference between front and back) was weaker, while that with leaf thickness and weight of leaf per area (physical properties)was relatively strong. Therefore, the appearance regional characteristics of tobacco leaf could be used to recognize its producing area.

     

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