为丰富我国红三叶种质资源，给红三叶品种选育提供优异材料，探讨国外引进资源在甘肃中部地区的综合表现，本文以来自俄罗斯、加拿大和美国的31份红三叶种质为供试材料，对其形态特征、农艺性状、生产性能等方面的14个指标进行了测定，发现其在生育期、株高、分枝数、叶面积、茎叶比、再生速度和干草产量等指标上差异非常显著。来源地对供试材料的形态特征和生产性能也有影响。个别种质材料在单一性状上表现优异，可直接应用于生产。通过主成分分析，选取方差累计贡献率达78．94％的前5个主成分对供试材料进行综合评价，结果表明，31份种质中，来自俄罗斯的 ZXY2008P-4996综合得分最高，表现最优，其次是来自美国的 Scarlett 和 Star fireⅡ；ZXY2008P-5419综合得分最低，适应性最差。依据主成分向量可将31份红三叶种质聚为4类。%To enrich the red clover (Trifolium pratense )germplasm resource in China and provide superior ma-terials for breeding,we conducted a comprehensive study on the performance of imported red clover germplasm in central Gansu.In total,31 red clover accessions were evaluated,and 14 traits including morphological,ag-ronomy,and productivity traits were measured.There were significant differences among accessions in growth period,plant height,branch number,leaf area,stem∶leaf ratio,regrowth speed,and hay yield.The source of the materials also affected morphological characteristics and productivity.A few accessions showed superior performance of a single trait and could be used directly to increase production.A principal component analysis of the 14 traits indicated that five traits with a 78.94% cumulative contribution rate could be used for compre-hensive evaluation of the red clover germplasm.In terms of performance,ZXY2008P-4996 from Russia was the best,followed by Scarlett and Star fire II from the United States.The accession ZXY2008P-5419 had the low-est score and showed the poorest adaptability.The 31 red clover accessions were grouped into four clusters based on principal component indexes.
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