不同产地红心猕猴桃品质的主成分及聚类分析

Principal Component and Cluster Analysis of Quality of Red-centred Kiwifruit from Different Habitats

为科学评价不同产地红心猕猴桃果实品质,建立红心猕猴桃品质评价体系,采用国标和农业标准方法测定11个产地果实外观品质和内在品质等16项指标,分析其品质指标的相关性,利用主成分和聚类分析法对红心猕猴桃的品质做出综合评价。结果表明,不同产地红心猕猴桃果实外观品质和内在品质均存在差异,其中微量元素差异较大,变异系数均大于20%,纵径差异最小,变异系数仅为6.66%。主成分分析表明,16项指标简化为6个主成分,累积方差贡献率为90.950%。利用相关性和主成分分析相结合,从16项品质指标中筛选出评价红心猕猴桃品质的6项核心品质指标,即纵径、糖酸比、维生素C、Co、Sr和Ba。根据聚类分析,11个产地红心猕猴桃可划分为4类,与主成分分析判定结果一致。11个产地红心猕猴桃中,奉新品质最好,其次是苍溪、周至和松桃,西峡品质最差。

In order to scientifically evaluate the quality of red-centred kiwifruit from different habitats and establish the quality evaluation system,16 quality attributes including the appearance quality and intrinsic quality of 11 habitats kiwifruit were measured by national standard method and agricultural standard method.The correlation of quality index of redcentred kiwifruit was analyzed.The quality of red-centred kiwifruit was comprehensively evaluated by principal component analysis and cluster analysis.The results showed that there were different appearance and intrinsic quality of red-centred kiwifruit from different habitats,the difference of trace elements was large and the coefficient of variation was greater than 20%,and the difference of longitudinal diameter was small and the coefficient of variation was only 6.66%.The principal component analysis showed that 6 principal components represented the 16 quality indexes of red-centred kiwifruit,and their cumulative variance contribution rate was up to 90.950%.Six quality indicators including longitudinal diameter,sugar-acid ratio,vitamin C,Co,Sr and Ba were screened out by using correlation analysis and principal component analysis from 16 quality indexes as the core indicators to comprehensively evaluate the fruit quality of red-centred kiwifruit.According to the cluster analysis,11 habitats red-centred kiwifruit were divided into 4 categories,which was consistent with the result of principal component analysis.Among the 11 habitats,red-centred kiwifruit from Fengxin had the best quality,followed by Cangxi,Zhouzhi,Songtao,and that from Xixia had the worst quality.