biogeochemical nitrogen cycle

例句：

1. 1.The biogeochemical nitrogen cycle is crucial for the health of ecosystems.
   生物地球化学氮循环对生态系统的健康至关重要。
2. 2. The study of the biogeochemical nitrogen cycle helps us understand how nitrogen is cycled in nature.
   研究生物地球化学氮循环有助于我们理解自然界中氮的循环过程。
3. 3.The biogeochemical nitrogen cycle plays a vital role in maintaining the balance of the planet's ecosystems.
   生物地球化学氮循环在维持地球生态系统平衡方面起着至关重要的作用。