河西走廊不同产地‘赤霞珠’酿酒葡萄果实品质评价

为了确定河西走廊地区‘赤霞珠’酿酒葡萄核心品质指标,建立‘赤霞珠’酿酒葡萄品质综合评价模型。从张掖、武威、嘉峪关3个酿酒葡萄主产市的代表性果园采集6份‘赤霞珠’葡萄样品进行品质测定,通过主成分分析和聚类分析法确定‘赤霞珠’葡萄核心品质指标,运用层次分析法确定指标权重并建立‘赤霞珠’葡萄品质综合评价模型。结果表明:(1)不同产地‘赤霞珠’酿酒葡萄品质指标存在明显差异性,张掖市国风葡萄酒庄园的‘赤霞珠’葡萄果糖、蔗糖、草酸、柠檬酸含量均高于其他地区,且可溶性固形物、可溶性糖、总酚、苹果酸含量在各产地中也均保持在最高水平。(2)相关性分析发现,葡萄果实葡萄糖含量与可溶性固形物含量、果糖与可溶性糖含量之间呈极显著正相关,固酸比和糖酸比均与可滴定酸含量呈极显著负相关关系。(3)综合主成分分析、聚类分析和相关性分析结果,确定维生素C(Vc)、单宁、果糖和固酸比是‘赤霞珠’葡萄核心品质指标,应用层次分析法建立了‘赤霞珠’葡萄品质综合评价模型为Y=0.0960×Vc含量+0.1611×单宁含量+0.2771×果糖含量+0.4568×固酸比(各指标含量均经过标准化处理)。研究发现,河西走廊地区‘赤霞珠’葡萄果实品质最佳产地是张掖市,果实Vc、单宁、果糖和固酸比是‘赤霞珠’葡萄的核心品质指标,以其建立的评价模型可用于‘赤霞珠’葡萄品质的综合评价。

Evaluation on Fruit Quality of Cabernet Sauvignon Wine Grapes from Different Producing Areas in Hexi Corridor

In order to determine the core quality index of Cabernet Sauvignon wine grape in Hexi Corridor, we established a comprehensive evaluation model for Cabernet Sauvignon wine grape quality. Six samples of Cabernet Sauvignon wine grapes were collected from three representative orchards of Zhangye, Wuwei and Jiayuguan, and the quality of Cabernet Sauvignon wine grapes was determined. The core quality index of Cabernet Sauvignon wine grape was determined by principal component analysis and cluster analysis. The analytic hierarchy process was used to determine the index weight and establish a comprehensive evaluation model of Cabernet Sauvignon wine grape quality. The results showed that: (1) there were significant differences in quality indexes of Cabernet Sauvignon wine grapes from different producing areas. The contents of fructose, sucrose, oxalic acid and citric acid of the Cabernet Sauvignon grape in Guofeng Wine manor of Zhangye City were higher than those in other areas. The contents of soluble solids, soluble sugar, total phenol and malic acid were kept at a high level in each producing area. (2) Correlation analysis showed that there was a very significant positive correlation between glucose content and soluble solids content, fructose content and soluble sugar content in grape fruit. Solid ratio and sugar acid ratio were significantly negatively correlated with titratable acid content. (3) Combined with principal component analysis, cluster analysis and correlation analysis, we found Vc, tannin, fructose and solid acid ratio were determined as the core quality indexes of Cabernet Sauvignon grape. The comprehensive evaluation model for grape quality of Cabernet Sauvignon was established by analytic hierarchy process (Y=0.0960 Vc content + 0.1611 tannin content + 0.2771 fructose content + 0.4568 solid acid ratio (all index contents were standardized). It is found that Zhangye is the best Cabernet Sauvignon grape producing area for fruit quality in Hexi Corridor. Fruit Vc, tannin, fructose and solid acid ratio are the core quality indexes of the Cabernet Sauvignon grape. The established evaluation model can be used to comprehensively evaluate the quality of the Cabernet Sauvignon grape.