关键词: 羊草, 灰色关联度法, DTOPSIS法, 综合评价

Abstract: In order to explore the correlation between yield and phenotypic traits of Leymus chinensis germplasm resources and screen out excellent Leymus chinensis germplasm,28 Leymus chinensis germplasm resources were used as experimental materials in this study,and the correlations between 9 phenotypic traits were analyzed using two comprehensive evaluation methods. The results showed that the correlation orders between field phenotypic characteristics of Leymus chinensis and hay yield were obviously different between the two methods. Through the linear fitting analysis between the two methods and the actual hay production ranking results,it was found that the comprehensive evaluation by DTOPSIS entropy weight method and entropy method was the closest to the actual hay production results,and the correlation coefficients were 0.994 5 and 0.955 7,respectively.Through comprehensive evaluation,it was found that in the process of breeding new Leymus chinensis varieties with high yield,attention should be paid on increasing the proportion of spikelets,considering the proportion of leaf width,and other plant characters. After comprehensive evaluation,the three germplasm materials H8,H7 and H27 in the two evaluation methods had good high-yield potential,which could be further used as breeding materials for breeding high-yield varieties of Leymus chinensis.

Key words: Leymus chinensis, Grey correlation degree method, DTOPSIS method, Comprehensive evaluation