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nitrogen cyclen.（名词）- Ecology The circulation of nitrogen in nature, consisting of a cycle of chemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by bacteria and plants, eventually returning to the atmosphere by bacterial decomposition of organic matter.【生态学】 氮循环：氮在自然界中的循环，由一系列化学反应的循环构成，从大气氮被化合，在雨中分解，然后又沉淀于土壤中，在土壤中被细菌和植物吸收并经过新陈代谢，最后通过细菌分解有机物放回大气中
- Physics See carbon-nitrogen cycle 【物理学】 参见 carbon-nitrogen cycle
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