Partitioning forest carbon fluxes with overstory and understory eddy-covariance measurements: A synthesis based on FLUXNET data

Misson, L.; Baldocchi, D. D.; Black, T. A.; Blanken, P. D.; Brunet, Y.; Curiel Yuste, J.; Dorsey, J. R.; Falk, M.; Granier, A.; Irvine, M. R.; Jarosz, N.; Lamaud, E.; Launiainen, S.; Law, B. E.; Longdoz, Bernard; Loustau, D.; McKay, M.; Paw U, K. T.; Vesala, T.; Vickers, D.; Wilson, K. B.; Goldstein, Allen H.

doi:10.1016/j.agrformet.2007.01.006

Article (Scientific journals)

Partitioning forest carbon fluxes with overstory and understory eddy-covariance measurements: A synthesis based on FLUXNET data

Misson, L.; Baldocchi, D. D.; Black, T. A. et al.

2007 • In Agricultural and Forest Meteorology, 144 (1-2), p. 14-31

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https://hdl.handle.net/2268/209535

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10.1016/j.agrformet.2007.01.006

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Keywords :

Deciduous; Evergreen; Forest floor; Net ecosystem exchange; Photosynthesis; Respiration

Abstract :

[en] Forests are complex ecosystems characterized by several distinctive vertical layers with different functional properties. Measurements of CO2 fluxes by the eddy-covariance method at different heights can be used to separate sources and sinks in these layers. We used meteorological and eddy-covariance flux data gathered at 10 sites in the FLUXNET network across a wide range of forest type, structure and climate. We showed that eddy-covariance flux measurements made in the understory are problematic at night in open forests because of the build up of a strong inversion layer, but are more reliable during the day. Denser forests have higher turbulence at night in the understory because the inversion is weaker. However, the flux footprint above and below canopy is less similar than in more open forests, partly because wind direction is more deflected while entering the canopy. We showed that gross primary productivity (GPP) of the understory can reach 39% of the total canopy GPP, with an average of 14% across the studied sites. Both understory leaf area index (LAI) and light penetration through the canopy are important for understory GPP. We found that understory respiration contributed an average of 55% to ecosystem respiration, with a range of 32-79%. Understory in deciduous forests (62%) had higher contributions to ecosystem respiration than in evergreen forests (49%). Boreal and temperate forests had a mean understory respiration contribution of 61%, while semi-arid forests showed lower values (44%). The normalized understory respiration fluxes at 20 °C were negatively related to soil temperature, when differences in soil moisture across sites are taken into account. We showed evidence that drought limited the efficiency of microbial metabolic activity. Understory respiration fluxes were positively correlated with gross ecosystem primary productivity. © 2007 Elsevier B.V. All rights reserved.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Misson, L.; CEFE-CNRS, 1919 route de Mende, 34293 Montpellier Cedex 5, France

Baldocchi, D. D.; ESPM Department, University of California, 137 Mulford Hall, Berkeley, CA 94720-3110, United States

Black, T. A.; Faculty of Land and Food Systems, University of British Columbia, 135-2357 Main Mall, Vancouver, BC V6T 1Z4, Canada

Blanken, P. D.; Department of Geography and Environmental Studies, University of Colorado at Boulder, 260 UCB, Boulder, CO 80501-0260, United States

Brunet, Y.; INRA-EPHYSE, BP 81, 71, rue Edouard Bourleaux, 33883 Villenave d'Ornon Cedex, France

Curiel Yuste, J.; ESPM Department, University of California, 137 Mulford Hall, Berkeley, CA 94720-3110, United States

Dorsey, J. R.; ESPM Department, University of California, 137 Mulford Hall, Berkeley, CA 94720-3110, United States

Falk, M.; Atmospheric Science, Biomicrometeorology Group, University of California, Davis, CA 95616, United States

Granier, A.; UMR Ecologie et Ecophysiologie Forestières, Centre INRA de Nancy, Route de l'Arboretum, 54280 Champenoux, France

Irvine, M. R.; INRA-EPHYSE, BP 81, 71, rue Edouard Bourleaux, 33883 Villenave d'Ornon Cedex, France

More authors (12 more)

Language :

English

Title :

Partitioning forest carbon fluxes with overstory and understory eddy-covariance measurements: A synthesis based on FLUXNET data

Publication date :

2007

Journal title :

Agricultural and Forest Meteorology

ISSN :

0168-1923

eISSN :

1873-2240

Publisher :

Elsevier Science, Amsterdam, Netherlands

Volume :

144

Issue :

1-2

Pages :

14-31

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 19 April 2017

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