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Carbon Dioxide Balance of Subarctic Tundra from Plot to Regional Scales : Volume 9, Issue 8 (01/08/2012)

By Marushchak, M. E.

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Book Id: WPLBN0003977346
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Carbon Dioxide Balance of Subarctic Tundra from Plot to Regional Scales : Volume 9, Issue 8 (01/08/2012)  
Author: Marushchak, M. E.
Volume: Vol. 9, Issue 8
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Kiepe, I., Biasi, C., Johansson, T., Friborg, T., Martikainen, P. J., Marushchak, M. E.,...Virtanen, T. (2012). Carbon Dioxide Balance of Subarctic Tundra from Plot to Regional Scales : Volume 9, Issue 8 (01/08/2012). Retrieved from http://ebook2.worldlibrary.net/


Description
Description: Department of Environmental Science, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland. We report here the carbon dioxide (CO2) budget of a 98.6-km2 subarctic tundra area in Northeast European Russia based on measurements at two different scales and two independent up-scaling approaches. Plot scale measurements (chambers on terrestrial surfaces, gas gradient method and bubble collectors on lakes) were carried out from July 2007 to October 2008. The landscape scale eddy covariance (EC) measurements covered the snow-free period 2008. The annual net ecosystem exchange (NEE) of different land cover types ranged from −251 to 84 g C m−2. Leaf area index (LAI) was an excellent predictor of the spatial variability in gross photosynthesis (GP), NEE and ecosystem respiration (ER). The plot scale CO2 fluxes were first scaled up to the EC source area and then to the whole study area using two data sets: a land cover classification and a LAI map, both based on field data and 2.4 m pixel-sized Quickbird satellite image. The good agreement of the CO2 balances for the EC footprint based on the different methods (−105 to −81 g C m−2 vs. −79 g C m−2; growing season 2008) justified the integration of the plot scale measurements over the larger area. The annual CO2 balance for the study region was −67 to −41 g C m−2. Due to the heterogeneity of tundra, the effect of climate change on CO2 uptake will vary strongly according to the land cover type and, moreover, likely changes in their relative coverage in future will have great impact on the regional CO2 balance.

Summary
Carbon dioxide balance of subarctic tundra from plot to regional scales

Excerpt
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