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Research article - Peer-reviewed, 2009

Photosynthetic characteristics of Fagus sylvatica and Quercus robur established for stand conversion from Picea abies

Gardiner Emile S., Lof Magnus, O'Brien Joseph J., Stanturf John A., Madsen Palle

Abstract

Efforts in Europe to convert Norway spruce (Picea abies) plantations to broadleaf or mixed broadleaf-conifer forests could be bolstered by an increased understanding of how artificial regeneration acclimates and functions under a range of Norway spruce stand conditions. We studied foliage characteristics and leaf-level photosynthesis on 7-year-old European beech (Fagus sylvatica) and pedunculate oak (Quercus robur) regeneration established in open patches and shelterwoods of a partially harvested Norway spruce plantation in southwestern Sweden. Both species exhibited morphological plasticity at the leaf level by developing leaf blades in patches with an average mass per unit area (LMA) 54% greater than of those in shelterwoods, and at the plant level by maintaining a leaf area ratio (LAR) in shelterwoods that was 78% greater than in patches. However, we observed interspecific differences in photosynthetic capacity relative to spruce canopy openness. Photosynthetic capacity (A(1600), net photosynthesis at a photosynthetic photon flux density of 1600 mu mol photons m(-2) s(-1)) of beech in respect to the canopy gradient was best related to leaf mass, and declined substantially with increasing canopy openness primarily because leaf nitrogen (N) in this species decreased about 0.9 mg g(-1) with each 10% rise in canopy openness. In contrast, A(1600) of oak showed a weak response to mass-based N, and furthermore the percentage of N remained constant in oak leaf tissues across the canopy gradient. Therefore, oak photosynthetic capacity along the canopy gradient was best related to leaf area, and increased as the spruce canopy thinned primarily because LMA rose 8.6 g m(-2) for each 10% increase in canopy openness. These findings support the premise that spruce stand structure regulates photosynthetic capacity of beech through processes that determine N status of this species; leaf N (mass basis) was greatest under relatively closed spruce canopies where leaves apparently acclimate by enhancing light harvesting mechanisms. Spruce stand structure regulates photosynthetic capacity of oak through processes that control LMA; LMA was greatest under open spruce canopies of high light availability where leaves apparently acclimate by enhancing CO(2) fixation mechanisms. Published by Elsevier B.V.

Keywords

Fagus sylvatica; Quercus robur; Picea abies; Photosynthetic light response; Nitrogen; Canopy cover; Regeneration

Published in

Forest Ecology and Management
2009, volume: 258, number: 5, pages: 868-878
Publisher: Elsevier

Authors' information

Gardiner, Emile S.
Swedish University of Agricultural Sciences, Southern Swedish Forest Research Centre
O'Brien, Joseph J.
United States Department of Agriculture (USDA)
Stanturf, John
Madsen, Palle

Sustainable Development Goals

SDG15 Life on land

UKÄ Subject classification

Forest Science

Publication Identifiers

DOI: https://doi.org/10.1016/j.foreco.2009.03.022

URI (permanent link to this page)

https://res.slu.se/id/publ/25580