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Modeling carbon allocation in trees: a search for principles

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Author

  • Oskar Franklin
  • Jacob Johansson
  • Roderick C. Dewar
  • Ulf Dieckmann
  • Ross E. McMurtrie
  • Ake Brannstrom
  • Ray Dybzinski

Summary, in English

We review approaches to predicting carbon and nitrogen allocation in forest models in terms of their underlying assumptions and their resulting strengths and limitations. Empirical and allometric methods are easily developed and computationally efficient, but lack the power of evolution-based approaches to explain and predict multifaceted effects of environmental variability and climate change. In evolution-based methods, allocation is usually determined by maximization of a fitness proxy, either in a fixed environment, which we call optimal response (OR) models, or including the feedback of an individual's strategy on its environment (game-theoretical optimization, GTO). Optimal response models can predict allocation in single trees and stands when there is significant competition only for one resource. Game-theoretical optimization can be used to account for additional dimensions of competition, e.g., when strong root competition boosts root allocation at the expense of wood production. However, we demonstrate that an OR model predicts similar allocation to a GTO model under the root-competitive conditions reported in free-air carbon dioxide enrichment (FACE) experiments. The most evolutionarily realistic approach is adaptive dynamics (AD) where the allocation strategy arises from eco-evolutionary dynamics of populations instead of a fitness proxy. We also discuss emerging entropy-based approaches that offer an alternative thermodynamic perspective on allocation, in which fitness proxies are replaced by entropy or entropy production. To help develop allocation models further, the value of wide-ranging datasets, such as FLUXNET, could be greatly enhanced by ancillary measurements of driving variables, such as water and soil nitrogen availability.

Publishing year

2012

Language

English

Pages

648-666

Publication/Series

Tree Physiology

Volume

32

Issue

6

Document type

Journal article review

Publisher

Oxford University Press

Topic

  • Biological Sciences

Keywords

  • tree growth
  • soil depth
  • plasticity
  • partitioning
  • theory
  • game
  • functional balance
  • acclimation
  • evolutionarily stable strategy

Status

Published

Research group

  • Theoretical Population Ecology and Evolution Group

ISBN/ISSN/Other

  • ISSN: 1758-4469