nitrogen n cycle氮循环
nitrogen-cycle氮循环
carbon n nitrogen cycle碳
nitrogen-phosphorus cycle氮磷循环
nitrogen cycle bacteria氮循环茵;氮循环菌
soil nitrogen cycle氮素循环
Nitrogen cycle refrigeration氮循环制冷
the nitrogen cycle氮循环;氮素循环;循环
carbon nitrogen cycle碳循环;碳
Instead,if the population is concentrated in small and medium-sized cities or small towns,there would be 179,000 tons or 534,000 tons pure nitrogen returning to farmland. The larger size of the city decreases the lower the utilization rate of nitrogen cycle.
城市规模越大,氮素循环利用率越低。
参考来源 - 城镇化对我国食物消费系统氮素流动和农田氮素循环的影响The autotrophic nitrifying bacteria play a critical role in nitrogen cycle in nature.
硝化细菌是一大类在自然界氮循环中起关键作用微生物菌群。
参考来源 - 硝化细菌应用技术研究N（名词） the natural circulation of nitrogen by living organisms. Nitrates in the soil, derived from dead organic matter by bacterial action, are absorbed and synthesized into complex organic compounds by plants and reduced to nitrates again when the plants and the animals feeding on them die and decay 氮循环→see nitrification, nitrogen fixation