环境因子的限制一直是豆科植物-根瘤菌共生固氮体系没有在农业生产中充分发挥作用的重要原因之一。
Environmental factors are always one of the major reasons why the symbiotic nitrogen-fixing system of rhizobia and legumes cannot come into full play in agricultural production.
豆科植物的共生固氮作用一直是科学研究的热点问题，但在高寒草甸上研究的比较少。
Symbiotic nitrogen fixation of legumes with azotobacteria was a hot topic of scientific research, but less focus on alpine meadow community.
其中研究的较早的生物固氮菌是与豆科植物共生固氮的根瘤菌。
Early study object of the biological nitrogen fixation bacterium is the Rhizobium which related to the nitrogen fixation of the Leguminosae.
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