RannikAltimirRaittilaEtAl2002

Référence

Rannik, U., Altimir, N., Raittila, J., Suni, T., Gaman, A., Hussein, T., Holtta, T., Lassila, H., Latokartano, M., Lauri, A., Natsheh, A., Petaja, T., Sorjamaa, R., Yla-Mella, H., Keronen, P., Berninger, F., Vesala, T., Hari, P. and Kulmala, M. (2002) Fluxes of carbon dioxide and water vapour over Scots pine forest and clearing. Agricultural and Forest Meteorology, 111(3):187-202.

Résumé

The carbon dioxide and water vapour fluxes were measured by the eddy covariance (EC) technique from July to September 2000 at two closely located sites in southern Finland: over a 38-year-old pine forest and over a 5-year-old forest clearing. The night-time respiration was of the same magnitude at both sites. At day-time the pine forest was a strong sink but the clearing close to CO2 balance, indicating that CO2 uptake of ground vegetation over the clearing balanced the release from the soil. The shoot scale gas exchange measurements in combination with process-based modelling were used to evaluate the measured CO2 exchange of the forest ecosystem. The forest CO2 exchange was explained by soil respiration and photosynthesis of forest canopy, while the contribution of understory and ground vegetation CO2 exchange could be neglected. During the study period the forest was a net sink of CO2 and the clearing a source. The daily average uptake of CO2 by the forest was -2.4 and -1.7 g m-2 per day in July-August and September periods, respectively; and average release by the clearing 4.0 and 2.5 g m-2 per day during the same periods. This shows that carbon losses 5 years after clear-cutting are substantial. The evapotranspiration (ET) was higher over the forest compared to clearing as a result of transpiration from the forest canopy. The difference in ET was small during the July-August period when precipitation frequently occurred. © 2002 Elsevier Science B.V. All rights reserved.

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@ARTICLE { RannikAltimirRaittilaEtAl2002,
    AUTHOR = { Rannik, U. and Altimir, N. and Raittila, J. and Suni, T. and Gaman, A. and Hussein, T. and Holtta, T. and Lassila, H. and Latokartano, M. and Lauri, A. and Natsheh, A. and Petaja, T. and Sorjamaa, R. and Yla-Mella, H. and Keronen, P. and Berninger, F. and Vesala, T. and Hari, P. and Kulmala, M. },
    TITLE = { Fluxes of carbon dioxide and water vapour over Scots pine forest and clearing },
    JOURNAL = { Agricultural and Forest Meteorology },
    YEAR = { 2002 },
    VOLUME = { 111 },
    PAGES = { 187-202 },
    NUMBER = { 3 },
    NOTE = { 01681923 (ISSN) Cited By (since 1996): 16 Export Date: 24 April 2007 Source: Scopus CODEN: AFMEE doi: 10.1016/S0168-1923(02)00022-9 Language of Original Document: English Correspondence Address: Rannik, U?.; Department of Physical Sciences; Universiry of Helsinki; P.O. Box 64 FIN-00014 Helsinki, Finland; email: ullar.rannik@helsinki.fi References: Aalto, T., Carbon dioxide exchange of Scots pine shoots as estimated by a biochemical model and cuvette measurements (1998) Silva Fenn., 32 (4), pp. 321-337; Amiro, B.D., Paired-tower measurements of carbon and energy fluxes following disturbance in the boreal forest (2001) Global Change Biol., 7, pp. 253-268; Aubinet, M., Grelle, A., Ibrom, A., Rannik, U?., Moncrieff, J., Foken, T., Kowalski, A.S., Vesala, T., Estimates of the annual net carbon and water exchange of European forests: The EUROFLUX methodology (2000) Adv. Ecol. 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    ABSTRACT = { The carbon dioxide and water vapour fluxes were measured by the eddy covariance (EC) technique from July to September 2000 at two closely located sites in southern Finland: over a 38-year-old pine forest and over a 5-year-old forest clearing. The night-time respiration was of the same magnitude at both sites. At day-time the pine forest was a strong sink but the clearing close to CO2 balance, indicating that CO2 uptake of ground vegetation over the clearing balanced the release from the soil. The shoot scale gas exchange measurements in combination with process-based modelling were used to evaluate the measured CO2 exchange of the forest ecosystem. The forest CO2 exchange was explained by soil respiration and photosynthesis of forest canopy, while the contribution of understory and ground vegetation CO2 exchange could be neglected. During the study period the forest was a net sink of CO2 and the clearing a source. The daily average uptake of CO2 by the forest was -2.4 and -1.7 g m-2 per day in July-August and September periods, respectively; and average release by the clearing 4.0 and 2.5 g m-2 per day during the same periods. This shows that carbon losses 5 years after clear-cutting are substantial. The evapotranspiration (ET) was higher over the forest compared to clearing as a result of transpiration from the forest canopy. The difference in ET was small during the July-August period when precipitation frequently occurred. © 2002 Elsevier Science B.V. All rights reserved. },
    KEYWORDS = { Carbon dioxide exchange Eddy covariance Evapotranspiration Forest clear-cut Scots pine forest carbon dioxide coniferous forest evapotranspiration forest clearance gas exchange water vapor Finland Pinus sylvestris },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.04 },
}

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