甘蔗品质指标的通径分析和主成分分析

Path and Principal Component Analysis for Quality Indexes of Sugarcane

应用相关分析、通径分析和主成分分析方法,对78份粤糖系列甘蔗新品系的15个品质指标数据进行分析。相关分析结果表明,甘蔗蔗糖分除与甘蔗纤维分、蔗渣纤维分没有显著相关外,与其他12个品质指标均有极显著或显著相关性;甘蔗纤维分与出汁率、蒸煮液糖锤度、蔗渣水分、蒸煮液旋光读数、蔗渣糖度和蔗渣纤维分呈极显著相关,与其它7个蔗汁品质指标的相关性不显著。通径分析结果表明,甘蔗蔗糖分主要受蔗汁蔗糖分、蔗汁直接转光度、蔗渣糖度的直接作用和蔗汁转光度、蔗汁重力纯度的间接作用的影响,甘蔗纤维分则主要受蔗汁直接转光度、蔗渣纤维分、出汁率、蔗渣水分的直接作用和蔗汁转光度、蒸煮液旋光读数的间接作用的影响。主成分分析结果表明,13个品质指标可由蔗汁指标因子、蔗渣指标因子和甘蔗水分指标因子等3个主成分因子表示,其特征值累计贡献率达86.52%。

Fifteen quality indexes of seventy-eight Yuetang series of sugarcane lines were analyzed by correlation, path and principal compo- nent analysis in this paper. The result of correlation analysis showed that the sucrose in cane was very significantly or significantly correlated with the twelve quality indexes except for fiber in cane and fiber in bagasse. Fiber in cane was extremely associated with juice extraction rate, brix in bagasse, water content in bagasse, polarimeter reading in bagasse, sucrose in bagasse and fiber in bagasse, and not significantly related with seven quality indexes of juice. The results of path analysis showed that sucrose in cane was mainly influenced by the direct effects of sucrose in cane juice, polarization by sodium chloride and sucrose in bagasse, and the indirect effects of polarization of cane juice and gravity purity. Fiber in cane was primarily controlled by the direct effects of polarization by sodium chloride, fiber in bagasse, juice ex- traction rate, water content in bagasse, the indirect effects of polarization of cane juice and polarimeter reading in bagasse. The thirteen qual- ity indexes of sugarcane could be divided into three principal component factors with the cumulative variance contribution of 86.52 % by principal component analysis. Three principal component factors were juice indexes, bagasse indexes and water indexes of cane.