Title
Net primary production and carbon stocks for Subarctic mesicdry tundras with contrasting microtopography, altitude, and dominant species Net primary production and carbon stocks for Subarctic mesicdry tundras with contrasting microtopography, altitude, and dominant species
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
New York, N.Y. ,
Subject
Biology
Source (journal)
Ecosystems. - New York, N.Y.
Volume/pages
12(2009) :5 , p. 760-776
ISSN
1432-9840
ISI
000268492000005
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Mesicdry tundras are widespread in the Arctic but detailed assessments of net primary production (NPP) and ecosystem carbon (C) stocks are lacking. We addressed this lack of knowledge by determining the seasonal dynamics of aboveground vascular NPP, annual NPP, and whole-ecosystem C stocks in five mesicdry tundras in Northern Sweden with contrasting microtopography, altitude, and dominant species. Those measurements were paralleled by the stock assessments of nitrogen (N), the limiting nutrient. The vascular production was determined by harvest or in situ growing units, whereas the nonvascular production was obtained from average species growth rates, previously assessed at the sites. Results showed that aboveground vascular NPP (15270 g m−2), annual NPP (214282 g m−2 or 102137 g C m−2) and vegetation biomass (3302450 g m−2) varied greatly among communities. Vegetation dominated by Empetrum hermaphroditum is more productive than Cassiope tetragona vegetation. Although the large majority of the apical NPP occurred in early-mid season (85%), production of stems and evergreen leaves proceeded until about 2 weeks before senescence. Most of the vascular vegetation was belowground (80%), whereas most of the vegetation production occurred aboveground (85%). Ecosystem C and N stocks were 21008200 g C m−2 and 80330 g N m−2, respectively, stored mainly in the soil turf and in the fine organic soil. Such stocks are comparable to the C and N stocks of moister tundra types, such as tussock tundra.
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