Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen

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http://hdl.handle.net/10138/247106

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Kaitaniemi , P , Lintunen , A , Sievänen , R & Perttunen , J 2018 , ' Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen ' , Ecological Informatics , vol. 48 , pp. 171–177 . https://doi.org/10.1016/j.ecoinf.2018.09.009

Title: Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen
Author: Kaitaniemi, Pekka; Lintunen, Anna; Sievänen, Risto; Perttunen, Jari
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-11
Language: eng
Number of pages: 7
Belongs to series: Ecological Informatics
ISSN: 1574-9541
URI: http://hdl.handle.net/10138/247106
Abstract: Foliar nitrogen is one of the key traits determining the photosynthetic capacity of trees. It is influenced by many environmental factors that are often confounded with the photosynthetic photon flux density (PPFD), which alone strongly modifies the nitrogen content and other foliar traits. We combined field measurements and computational estimates of light transmittance in 3D stands with different combinations of Scots pine (Pinus sylvestris) and silver birch (Betula pendula) to decouple the effect of PPFD from other potential effects exerted by the species of neighbouring trees on the leaf nitrogen content per unit leaf area (Narea) and leaf mass per area (LMA). Independent of the level of PPFD, silver birch had a significantly lower Narea and LMA when Scots pine was abundant in its neighbourhood compared with the presence of conspecific neighbours. In Scots pine, Narea and LMA were only dependent on PPFD and the branching order of shoots. In both species, the relationships between PPFD and Narea or LMA were nonlinear, especially at intermediate levels of PPFD. The levels of PPFD did not show any dependence on the species of the neighbouring trees. The responses of silver birch suggest that the species composition of the surrounding stand can influence foliar nitrogen, independent of the level of PPFD within the canopy.
Subject: 3D stand model
Leaf nitrogen
Light gradient
Species interactions
Stand composition
PINE PINUS-SYLVESTRIS
LEAF TRAITS
CHLOROPHYLL FLUORESCENCE
SHOOT GROWTH
INTERCEPTION EFFICIENCY
SILVER BIRCH
CROWN ARCHITECTURE
PHOTOSYNTHETIC CHARACTERISTICS
SCOTS PINE
BETULA-PENDULA
1181 Ecology, evolutionary biology
4112 Forestry
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