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中文摘要：
应用居群生物学的原理和方法，对分布于中国7个地区、40个鹅观草（Roegneria kamoji Ohwi）居群的表型多样性进行了分析。结果显示：鹅观草15个表型性状的总遗传多样性指数为1．825，表明鹅观草具有丰富的遗传多样性；居群内多样性指数为1．453，居群问为0．372，表型分化系数为28．38％，表明居群内的遗传变异是引起鹅观草变异的主要因素；在7个不同分布区，鹅观草的多样性存在较明显的差异，多样性指数从大到小的顺序为四川（1．583）〉云南（1．392）〉新疆（1。372）〉甘肃（1．351）〉内蒙古（1．284）〉宁夏（1.235）〉山西（0．890）。因此在进行鹅观草种质资源收集时，建议对四川和云南地区的鹅观草种质资源应给予较大关注。
英文摘要：
According to the population biology theories and statistical methods, Phenotypic diversity of 40 populations of Roegneria karnoji Ohwi distributed in 7 regions of China was studied. The results showed as follows： the total genetic diversity index of 40 R. kamoji populations about 15 phenotypic traits was 1. 825, this means there was an abundant phenotypic diversity among these populations. The diversity index among and within populations were 0. 372 and 1. 453 respectively. The mean phenotypic differentiation coefficient （Vst=28. 38%） showed that the variation within population was the main factor that resulted in the genet- ic variation of R. karnoji; Phenotypic diversity of this specie distributed in the 7 regions was different, whose order is Sichuan region （ 1.583） 〉 Yunnan region （ 1.392 ） 〉 Xinj iang region （ 1.372 ） 〉 Gansu region （1. 351）〉Inner Mongolia region （1. 284）〉Ningxia region （1. 235）〉Shanxi region（0. 890）. So high em- phasis should be put on R. leamoji population distributed in Sichuan and Yunnan for the germplasm re- sources collection.
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