博文
Marine nitrogen cycle
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Due to the oxidizing nature of the Earth’s surface environment, including most of the oceanic water column, nitrate (NO3-) is by far the most abundant combined nitrogen species in aquatic systems.
From "Marine nitrogen cycle" by Naqvi:
http://www.eoearth.org/article/Marine_nitrogen_cycle
https://blog.sciencenet.cn/blog-306792-435897.html
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