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

Pekka Kaitaniemi, Anna Lintunen, Risto Sievänen, Jari Perttunen

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

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.
Originalspråkengelska
TidskriftEcological Informatics
Volym48
Sidor (från-till)171–177
Antal sidor7
ISSN1574-9541
DOI
StatusPublicerad - nov 2018
MoE-publikationstypA1 Tidskriftsartikel-refererad

Vetenskapsgrenar

  • 1181 Ekologi, evolutionsbiologi
  • 4112 Skogsvetenskap

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title = "Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen",
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.",
keywords = "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",
author = "Pekka Kaitaniemi and Anna Lintunen and Risto Siev{\"a}nen and Jari Perttunen",
year = "2018",
month = "11",
doi = "10.1016/j.ecoinf.2018.09.009",
language = "English",
volume = "48",
pages = "171–177",
journal = "Ecological Informatics",
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Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen. / Kaitaniemi, Pekka; Lintunen, Anna; Sievänen, Risto; Perttunen, Jari.

I: Ecological Informatics, Vol. 48, 11.2018, s. 171–177.

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

TY - JOUR

T1 - Computational analysis of the effects of light gradients and neighbouring species on foliar nitrogen

AU - Kaitaniemi, Pekka

AU - Lintunen, Anna

AU - Sievänen, Risto

AU - Perttunen, Jari

PY - 2018/11

Y1 - 2018/11

N2 - 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.

AB - 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.

KW - 3D stand model

KW - Leaf nitrogen

KW - Light gradient

KW - Species interactions

KW - Stand composition

KW - PINE PINUS-SYLVESTRIS

KW - LEAF TRAITS

KW - CHLOROPHYLL FLUORESCENCE

KW - SHOOT GROWTH

KW - INTERCEPTION EFFICIENCY

KW - SILVER BIRCH

KW - CROWN ARCHITECTURE

KW - PHOTOSYNTHETIC CHARACTERISTICS

KW - SCOTS PINE

KW - BETULA-PENDULA

KW - 1181 Ecology, evolutionary biology

KW - 4112 Forestry

U2 - 10.1016/j.ecoinf.2018.09.009

DO - 10.1016/j.ecoinf.2018.09.009

M3 - Article

VL - 48

SP - 171

EP - 177

JO - Ecological Informatics

JF - Ecological Informatics

SN - 1574-9541

ER -