Nitrogen cycle | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Nitrogen_cycle


00:01:21 1 Processes
00:02:32 1.1 Nitrogen fixation
00:04:32 1.2 Assimilation
00:05:54 1.3 Ammonification
00:06:39 1.4 Nitrification
00:08:40 1.5 Denitrification
00:09:36 1.6 Dissimilatory nitrate reduction to ammonium
00:10:27 1.7 Anaerobic ammonia oxidation
00:11:04 1.8 Other processes
00:11:10 2 Marine nitrogen cycle
00:11:20 2.1 New vs. regenerated nitrogen
00:11:37 3 Human influences on the nitrogen cycle
00:16:15 4 Consequence of human modification of the nitrogen cycle
00:17:29 4.1 Impacts on natural systems
00:21:16 4.2 Impacts on human health: nitrate accumulation in drinking water
00:21:29 4.3 Impacts on human health: air quality
00:24:30 5 See also
00:26:14 6 References
00:27:51 See also



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SUMMARY
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The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. The conversion of nitrogen 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 atmosphere nitrogen, making it the largest source 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. Human modification of global nitrogen cycle can negatively affect the natural environment system and also human health.