Analysis on C3F Grade Quality of Flue-cured Tobacco Handed-over from Commerce to Industry in the Model of Specialized Grading and Loose-leaf Purchasing in Yunnan Province
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摘要: 为进一步探索专分散收模式下的烟叶等级质量，以2018年云南省烟叶工商交接等级质量监督检查抽检的12个州（市）79个县（市、区）的154个批次7700把C3F烟叶为材料，对混低、混微带青、混杂、混部位、混中等烟、混下部和混下等烟7个等级质量影响因素进行了主成分分析，提取了3个主成分因子，基于主成分综合得分对154个批次不同县（区、市）级产区的烟叶进行了聚类分析。结果表明：（1）C3F混非原级比例较高的等级为C4F和X2F；（2）提取的3个主成分累计贡献率达到87.608%，其中第1主成分贡献率为44.722%，确定混低、混中等烟、混部位、混下部4项指标为影响C3F等级质量的主要因素；（3）K-Means聚类将154个批次各产区的C3F烟叶聚为3类，第1类为等级质量受混杂和混下等烟较为突出的14个批次，第2类为混低、混中等烟、混部位和混下部影响突出，但混青杂较少的127个批次，第3类为混青突出的13个批次，主成分分析和聚类结果较为一致；（4）结合混非原级情况，表明专分散收模式下C3F等级质量的主要问题是混低和混部位。Abstract: In order to explore the change of grade quality under the new loose-leaf purchasing mode, 7700 bundles of C3F tobacco from 154 batches of grade quality supervision and inspection samples in 2018 industry/commerce handover, including samples from 12 prefecture (cities), 79 counties (cities, districts) in Yunnan, were studied. Principal component analysis was carried out among 7 factors influencing grade quality, including mixed low grades, mixed cany leaves, mixed variegated, mixed parts, mixed medium quality, mixed bottom part, and mixed low quality, from which 3 principal component factors were extracted. Based on the comprehensive scores of principal components, cluster analysis was performed using the 154 batches of tobacco leaves from different growing areas. The results showed that: (1) The grades C4F and X2F exhibited ralatively high proportion among mixed non-sampled grades; (2) The cumulative contribution rate reached 87.608% for the 3 extracted principal component factors, among which the contribution rate of the 1st principal component was 44.722%. Mixed low grades, mixed medium grades, mixed stalk positions, and mixed bottom leaves were the principal factors influencing the grade quality of C3F; (3) K-Means analysis clustered the 154 batches of C3F tobacco leaves from different growing areas into 3 categories. The 1st cluster included 14 batches of which grade quality was mainly influenced by mixed variegated leaves and mixed inferior grades. The 2nd cluster included 127 batches of which grade quality was mainly influenced by mixed low grades, mixed medium grades, mixed stalk positions, mixed bottom leaves, but less influenced by mixed cany and variegated leaves. The rest 13 batches formed the 3rd cluster of which grade quality was mainly influenced by mixed cany leaves. The results from the principal component analysis and the cluster analysis accordantly agreed with each other. (4) Together with the mixed non-sampled grades situation, under the new loose-leaf purchasing mode, the major problems of C3F grade quality were mixed low grades and mixed stalk positon.
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1. 陈斌，徐玮杰，王超，汤朝起，王戈，杨凯. 商业烟叶收购等级质量与工业认可度比较研究. 中国烟草学报. 2022(01): 108-114 . 
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