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Interaction between N and C in Soil has Consequences for Global Carbon Cycling
Halmstad University, School of Business and Engineering (SET), Biological and Environmental Systems (BLESS), Ecology and Environmental Science.
2012 (English)In: Journal of Resources and Ecology, ISSN 1674-764X, Vol. 3, no 1, 16-19 p.Article in journal (Refereed) Published
Abstract [en]

Energy—yielding processes in the N—cycle form important links with the global C—cycle. One example is demonstrated with the supply of nitrogen to soils, initially resulting in lowered CO2 emissions. This well known effect has mostly been interpreted as hampered or delayed soil respiration. When added in surplus, however, nitrogen supply does not stabilize the minimum emissions initially obtained, but gradually results in increased CO2 emissions. Specific inhibition of the CO2 consuming process nitrification in soils, with surplus ammonium supply or with acetylene, mostly results in additional CO2 emissions. The difference between this disclosed gross heterotrophic respiration (GHR) and the net CO2 emission (NHR) is the result of a within—soil CO2—sink. Soil respiration solely determined as CO2 emitted as NHR (the common situation) therefore may lead to misinterpretations of the function of the soil system, especially in areas with high N—deposition. As a consequence, the interpreted ‘acclimation’ of the soil respiration response in a warmer world should be reconsidered. The concept of respiration inhibition by nitrogen supply may also be questioned. Disregard of these processes, including the indicated N—driven within—soil CO2—sink, may prevent adequate measures counteracting climate change.

Place, publisher, year, edition, pages
Beijing: Science Press, 2012. Vol. 3, no 1, 16-19 p.
Keyword [en]
soil respiration, carbon sink, CO2 emissions, temperature response, climate change, N—supply
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:hh:diva-17545DOI: 10.5814/j.issn.1674-764x.2012.01.003OAI: oai:DiVA.org:hh-17545DiVA: diva2:517337
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Växthusgaser
Available from: 2012-04-23 Created: 2012-04-23 Last updated: 2012-10-19Bibliographically approved

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Publisher's full texthttp://www.jorae.cn/EN/10.5814/j.issn.1674-764x.2012.01.003

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CiteExportLink to record
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