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Effects of light availability and tree size on the architecture of assimilative surface in the canopy of Picea abies: variation in needle morphology

Title data

Niinemets, Ülo ; Kull, Olevi:
Effects of light availability and tree size on the architecture of assimilative surface in the canopy of Picea abies: variation in needle morphology.
In: Tree Physiology. Vol. 15 (1995) Issue 5 . - pp. 307-315.
ISSN 1758-4469
DOI: https://doi.org/10.1093/treephys/15.5.307

Abstract in another language

Needle dimensions, needle surface area, needle dry weight per area (LWA) and needle density (ND, needle weight per volume) were measured in terminal current-year shoots in a natural canopy of variably sized Picea abies (L.) Karst. trees growing along a light gradient. Needle shape was described as a rhomboid. Needle width (D-2) increased with increasing diffuse site factor, a(d) (relative amount of penetrating diffuse solar radiation), whereas needle thickness (D-1) remained nearly constant, resulting in an inverse relationship between D-1/D-2 and a(d) and an increase in the ratio of total (TLA) to projected needle surface area (PLA) with increasing a(d). Because of the variations in needle morphology with respect to light availability the shoot parameters used in present canopy models are also expected to be light-sensitive, and studies involving shoot morphology should also consider the variability in needle geometry. Needle dimensions and total tree height were not correlated. However, LWA increased with both increasing a(d) and total tree height. When LWA was expressed as the product of ND and needle height (NH, height of the rhomboidal transverse section of a needle), LWA appeared to increase with irradiance, because of changing NH, and with total tree height, because of changing needle density.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER7068
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:35
Last Modified: 11 Sep 2015 06:35
URI: https://eref.uni-bayreuth.de/id/eprint/19409