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Jan 15, 2021 · The nitrogen cycle refers to the cycle of nitrogen atoms through the living and non-living systems of Earth. The nitrogen cycle is vital for life on Earth. Through the cycle, atmospheric nitrogen is converted to a form which plants can incorporate into new proteins.
- Gabe Buckley
The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmospheric, terrestrial, and marine ecosystems. The conversion of nitrogen can be carried out through both biological and physical processes.
This article explores how nitrogen becomes available to organisms and what changes in nitrogen levels as a result of human activity means to local and global ecosystems.
Jul 30, 2024 · nitrogen cycle, circulation of nitrogen in various forms through nature. Nitrogen, a component of proteins and nucleic acids, is essential to life on Earth. Although 78 percent by volume of the atmosphere is nitrogen gas, this abundant reservoir exists in a form unusable by most organisms.
- The Editors of Encyclopaedia Britannica
Abstract. Global nitrogen fixation contributes 413 Tg of reactive nitrogen (N r) to terrestrial and marine ecosystems annually of which anthropogenic activities are responsible for half, 210 Tg N. The majority of the transformations of anthropogenic N r are on land (240 Tg N yr −1) within soils and vegetation where reduced N r contributes ...
- David Fowler, Mhairi Coyle, Ute Skiba, Mark A. Sutton, J. Neil Cape, Stefan Reis, Lucy J. Sheppard, ...
- 2013
Dec 27, 2023 · Nitrogen enters the living world through nitrogen fixation (Figure \(\PageIndex{1-2}\), the process of converting nitrogen gas into ammonia (NH 3), which spontaneously becomes ammonium (NH 4 +). Ammonium is found in bodies of water and in the soil (figure \(\PageIndex{1-2}\)).
Aug 5, 2023 · Nitrification. This aerobic process involves the stepwise oxidation of ammonia to nitrite and then to nitrate. First, bacteria like Nitrosomonas oxidize ammonia to nitrite (NO 2–). Following this, Nitrobacter takes over, oxidizing the nitrite to nitrate (NO 3–).
