中文摘要：

通过对青海、甘肃、宁夏和陕西部分地区豆科植物根瘤菌资源调查,共采集到根瘤样品1850份,包括野生和栽培豆科植物有20属41种,采集的根瘤86%着生在侧根或须根上,根瘤的形状主要有棒状、掌状、球状、珊瑚状,颜色多为黄色、粉色,少数呈白色或褐色。调查研究发现,六盘山棘豆为新发现的豆科结瘤植物;兴隆山棘豆为青海新记录植物。豆科植物与根瘤菌共生结瘤及根瘤特征,除了与寄主植物的遗传特性、发育时期有关外,还与其所处的生态环境（水分、温度、光照、土壤结构、土壤pH等）有密切的关系。

英文摘要：

An investigate was conducted on leguminous plants and rhizobial resources in some regions of Qinghai,Gansu,Ningxia and Shaanxi in Northwest China,in which a total number of 1850 root nodule samples were collected,including 20 genera,41species of cultivated and wild legumes legumes.In the samples,86% of the root nodules were distributed on lateral root or fibre, and they were shaped as claviform,palmated,coralliform or spherical,most in colors of yellow and pink,and few in white and brown.Investigation and research results found that, Oxytropis ningxiaensis.C. W. Chang is a new discovered leguminous plant, Chang is a new record to Qinghai. Besides related to legume symbiosis nodulation with rhizobia and nodule which could be nodulation, and Oxytropis xinglongshanica C. W. the genetic characteristics and development period of host plants, characteristics has close relation to its ecological environment, including moisture, temperature, sunlight, soil structure, soil pH, etc. It would provide a scientific basis for the development and utilization of rhizobia germplasm resources.