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.
大豆随着氮肥施用量的增加，不仅抑制了大豆—根瘤菌的共生固氮作用，也给生态环境带来了不利的影响。
However, with the increasing of nitrogen fertilizer, it not only inhibits nitrogen fixation between soybean and rhizobium, but brings disadvantages to ecological environment.
大豆随着氮肥施用量的增加，不仅抑制了大豆—根瘤菌的共生固氮作用，也给生态环境带来了不利的影响。
However, with the increasing of nitrogen fertilizer, it not only inhibits nitrogen fixation between soybean and rhizobium, but brings disadvantages to ecological environment.
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