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The effects of temperature and nitrogen and sulfur additions on carbon accumulation in a nutrient-poor boreal mire: decadal effects assessed using 210Pb peat chronologies
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Department of Forest and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Department of Forest and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (Arcum)
2014 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, Vol. 119, no 3, 392-402 p.Article in journal (Refereed) Published
Abstract [en]

Boreal peatlands are a major long-term reservoir of atmospheric carbon (C) and play an important role in the global C cycle. It is unclear how C accumulation in peatlands responds to changing temperatures and nutrients (specifically, nitrogen and sulfur). In this study, we assessed how the C input rate and C accumulation rate in decadal old peat layers respond to increased air temperatures (+3.6 degrees C) during the growing season and the annual additions of nitrogen (N) and sulfur (S) (30 and 20kgha(-1)yr(-1), respectively) over 12years of field treatments in a boreal mire. An empirical mass balance model was applied to Pb-210-dated peat cores to evaluate changes in C inputs, C mass loss, and net C accumulation rates in response to the treatments. We found that (i) none of the treatments generated a significant effect on peat mass loss decay rates, (ii) C input rates were positively affected by N additions and negatively affected by S additions, (iii) the C accumulation rate in the uppermost (10 to 12cm) peat was increased by N additions and decreased by S additions, and (iv) only air temperature significantly affected the main effects induced by N and S additions. Based on our findings, we argue that C accumulation rates in surface peat layers of nutrient-poor boreal mires can increase despite the predicted rise in air temperatures as long as N loads increase and acid atmospheric S remains low. Key Points <list list-type="bulleted" id="jgrg20166-list-0001"> <list-item id="jgrg20166-li-0001">C accumulation in nutrient-poor boreal peatlands is increased by N fertilization <list-item id="jgrg20166-li-0002">Weak effects on C accumulation induced by greenhouse warming

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2014. Vol. 119, no 3, 392-402 p.
Keyword [en]
carbon, mire, climate change, Pb-210, temperature, nitrogen
National Category
Ecology Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-89243DOI: 10.1002/2013JG002365ISI: 000334534500015OAI: oai:DiVA.org:umu-89243DiVA: diva2:719622
Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2016-05-20Bibliographically approved

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CiteExportLink to record
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