Actinorhizal Plants are a kind of important natural nitrogen-fixing resources, and they have high value in reforestation as pioneer and accompanying species.

放线菌根瘤植物是自然界中一类重要的固氮资源，作为先锋树种和伴生树种在造林中有重要的应用价值。

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Although there is 34,500 tons of gaseous nitrogen in the air column above each acre of the earth's surface, this cannot be used by plants until it has been fixed by nitrogen-fixing bacteria and algae.

虽然在地球表面每英亩空气柱中有34,500吨气态氮，但是如果这些气态氮不被固氮菌和藻类固定，是不能被植物利用的。

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Symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate the formation of root nodules, enlargements of plant cells and bacteria in close association.

共生的固氮菌侵袭宿主植物的根毛，并在此繁殖和促进根瘤的形成、植物细胞和亲密共生细菌的扩大。

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He acknowledged that any soil used to grow nitrogen-fixing plants or were fertilised for agricultural reasons would result in an increase in gases involved in the formation of ozone.

BBC: Invasive plant 'increases ozone pollution'