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本文首次对青藏高原川西北高寒草地部分豆科植物进行了根瘤菌共生调查和性质研究，在若尔盖、红原、松潘等地海拔在３０００～３５００ｍ的草地上采集豆科植物根瘤样品５０多份，分别与２４种不同的豆科植物共生结瘤，从中分离到２ｌ株根瘤菌。研究发现，高原高寒草地豆科植物种类不如低海拔地区多，根瘤亦不发达，普遍偏小，且无效根瘤较多。由于气温低，根瘤菌对根的感染力不够强。但根瘤菌对低温和紫外线等不利因素有较强的抵抗力。对ＫＣｌ、ＮａＣｌ、ＣａＣｌ２、ＬｉＣｌ等盐类有较强的耐受力。
This article for the first time on the alpine meadows of northwestern Sichuan Plateau in northwestern Sichuan grassland rhizobium symbiotic investigation and nature of the research, in Ruoergai, Hongyuan, Songpan elevation of 3000 ~ 3500m grassland collected legume nodules samples more than 50, Respectively with 24 different legumes nodulation, isolated from 2l strains Rhizobia. The results showed that the species of leguminous plants in the plateau alpine grassland were not as good as those in the low altitude areas, and the nodules were not well developed, generally smaller and more nodules were ineffective. Due to the low temperature, Rhizobium infection of the root is not strong enough. However, rhizobia against low temperature and UV and other unfavorable factors have strong resistance. KCl, NaCl, CaCl2, LiCl and other salts have strong tolerance.