Abstract: Based on the correlative analysis of the 16 agronomic characteristics of Leymus chinensis and the path and regression analysis of its single plant forage yield and seed yield,we realize that the important elements that affect the single plant forage yield are the plant height,leaf width and the number of leaves.they outmatch all the other agronomic characteristics in directly contributing to the forage yield.The most important elements that affect the single plant seed yield are its fecundity rate and the number of florets.On the summed-up results,we suggest cultivating grassland by a Leymus chinensis species that tillers freely,and planting the grass closely so as to raise its forage yield and seed yield.

Key words: Leymus chinensis, Quantitative characters, correlaion, path analysis, stepuise regression model

摘要： 在羊草16个农艺性状相关分析的基础上,对其单株产草量和单株种子产量的构成进行通径和回归分析。结果表明,影响羊草单株产草量的重要因子有茎高、叶宽和叶数,它们不但与单株产草量的相关系数较大,而且直接贡献值超过了其他因子。影响羊草单株种子产量的重要因子为结实率和小花数,它们与单株种子产量的相关系数较大,其直接作用也较大。综合分析结果,提出选用分蘖力强的羊草种群,增加种植密度能够有效提高羊草的种子产量和产草量。

关键词: 羊草, 数量性状, 相关分析, 通径分析, 回归方程