柠条与沙棘共生固氮菌资源特性对比分析

A Comparative Analysis on Resources Characteristics of Symbiotic Nitrogen Fixation Strains of Peashrub and Hippophae

柠条与沙棘两种木本灌木均具有御旱与耐旱性，是山西省半干旱气候区的结瘤植物资源优势，其共生固氮菌Rhizobia与Frankia菌系在山西石灰性土壤中的生态分布广泛，结瘤特征明显，大约每年为该生态区提供10万～20万t的生物氮素，在山西的生态环境建设、水土保持与资源利用方面发挥着较大的生态学效应，具有深入研究和广泛的利用价值。

The Peashrub and Hippophae are important resource of nitrogen - fixing plant in semi - arid region in Shanxi province. The Rhizobia and Frankia nitrogen - fixing microorganisms carry out the major processes of nitrogen cycle in Symbiotic Nitrogen Fixation System. There is a wide distribution of Rhizobia and Frankia which is resistant to stress in Shanxi province. There are 150 ~ 200 thousands ton nitrogen is produced by Symbiotic N - Fixing strains of Rhizobium sp. （Caragana） and Frankia sp. （Hippophae） in Shanxi province. The N- fixing microorganisms play roles in ecological environment and Soil and water conservation. It is worth while to further study and utilize.