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Biophysical controls on CO2 fluxes of three Northern forets based on long-term eddy covariance data.

Author:
  • Fredrik Lagergren
  • Anders Lindroth
  • E Dellwik
  • A Ibrom
  • Harry Lankreijer
  • S Launiainen
  • Meelis Mölder
  • P Kolari
  • K Pilegaard
  • T Vesala
Publishing year: 2008
Language: English
Pages: 143-152
Publication/Series: Tellus. Series B: Chemical and Physical Meteorology
Volume: 60
Issue: 2
Document type: Journal article
Publisher: Taylor & Francis

Abstract english

Abstract in Undetermined

Six to nine years of net ecosystem carbon exchange (NEE) data from forests in Hyytiala in Finland, Soro in Denmark and Norunda in Sweden were used to evaluate the interannual variation in the carbon balance. For half-monthly periods, average NEE was calculated for the night-time data. For the daytime data parameters were extracted for the relationship to photosynthetic active radiation (PAR). The standard deviation of the parameters was highest for Norunda where it typically was around 25% of the mean, while it was ca. 15% for Hyytiala and Soro. Temperature was the main controller of respiration and photosynthetic capacity in autumn, winter and spring but explained very little of the interannual variation in summer. A strong correlation between respiration and photosynthesis was also revealed. The start, end and length of the growing season were estimated by four different criteria. The start date could explain some of the variation in yearly total NEE and gross primary productivity (GPP) in Hyytiala and Soro, but the average maximum photosynthetic capacity in summer explained more of the variation in annual GPP for all sites than start, end or length of the growing season.

Keywords

  • Physical Geography

Other

Published
  • ISSN: 0280-6509
E-mail: harry [dot] lankreijer [at] nateko [dot] lu [dot] se

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