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Net primary production and light use efficiency in a mixed coniferous forest in Sweden

Author:
  • Fredrik Lagergren
  • Lars Eklundh
  • A Grelle
  • M Lundblad
  • Meelis Mölder
  • Harry Lankreijer
  • Anders Lindroth
Publishing year: 2005
Language: English
Pages: 412-423
Publication/Series: Plant, Cell and Environment
Volume: 28
Issue: 3
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

Simple light use efficiency (epsilon) models of net primary production (NPP) have recently been given great attention (NPP = epsilon x absorbed photosynthetically active radiation). The underlying relationships have, however, not been much studied on a time step less than a month. In this study daily NPP was estimated as the sum of net ecosystem exchange (NEE) and heterotrophic respiration (R-h) of a mixed pine and spruce forest in Sweden. NEE was measured by eddy correlation technique and R-h was estimated from measurements of forest floor respiration (R-f) and the root share of R-f. The total yearly NPP was on average 810 g C m(-2) year(-1) for 3 years and yearly epsilon was between 0.58 and 0.71 g C MJ(-1), which is high in comparison with other studies. There was a seasonal trend in epsilon with a relatively constant level of approximately 0.90 g C MJ(-1) from April to September Daily NPP did not increase for daily intercepted radiation above 6 MJ m(-2) d(-1), indicating that between-years variation in NPP is not directly dependent on total Q(i). The light was most efficiently used at an average daytime temperature of around 15 degreesC. At daytime vapour pressure deficit above 1400 Pa epsilon was reduced by approximately 50%.

Keywords

  • Physical Geography
  • Norway spruce
  • light saturation
  • meteorological dependency
  • Scots pine
  • seasonal variation

Other

Published
  • ISSN: 0140-7791
E-mail: lars [dot] eklundh [at] nateko [dot] lu [dot] se

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Dept of Physical Geography and Ecosystem Science

+46 46 222 96 55

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Dept of Physical Geography and Ecosystem Science

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Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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