Abstract:Elaeagnus mollis Diels is a rare oil tree of high economic values in actinorhi-zal plant resources in China. Its ecological characteristics and the relations between ecological factors and the nodular nitrogenase activity were surveyed and studied.Surveying results indicated that the origin of Elaegnus mollis Diels is from warm temperat zone and semi-arid climate zone and it grows in drab soil of low mountain and hilly land. This species is characterised by a high tolerance to drought, cold and barren and a...