氮循环 Nitrogen cycle

（重定向自Nitrogen metabolism）

环境中氮的流向示意图。相关的细菌是循环中的关键因素，生产出不同种类的含氮化合物供更高等的生物体进行同化作用。参看条目马尔亭乌斯·贝叶林克。

A simple diagram of the nitrogen cycle. The blue boxes represent stores of nitrogen, the green writing is for processes that occur to move the nitrogen from one place to another and the red writing are all the bacteria involved.

Schematic representation of the flow of nitrogen through the environment. The importance of bacteria in the cycle is immediately recognized as being a key element in the cycle, providing different forms of nitrogen compounds assimilable by higher organisms

氮循环(英语：Nitrogen cycle)是描述自然界中氮单质和含氮化合物之间相互转换过程的生态系统的物质循环。

单词	Nitrogen metabolism
释义	Nitrogen metabolism 中文百科氮循环 Nitrogen cycle （重定向自Nitrogen metabolism）氮循环(英语：Nitrogen cycle)是描述自然界中氮单质和含氮化合物之间相互转换过程的生态系统的物质循环。英语百科 Nitrogen cycle 氮循环（重定向自Nitrogen metabolism） The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
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Nitrogen metabolism

氮循环 Nitrogen cycle

Nitrogen cycle 氮循环