Structural scaling and competitive sharing of resources in dynamics of mixed tree stands

Allometriset lait ja resurssikilpailu sekametsikön kasvun perustana

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Results of the project were presented in a meeting 26.2.2009. There were also presentations form the German Research Training Group "The Role of Biodiversity for Biogeochemical Cycles and Biotic Interactions in Temperate Deciduous Forest. Program and presentations of the seminar.

Period: 1.1.2005-31.12.2008

Funded by Academy of Finland

Sites of research:
1) Finnish Forest Research Institute, Vantaa Research Unit (Metla)
2) University of Helsinki, Department of Forest Ecology (UHE-FE)
3) University of Helsinki, Hyytiälä Forestry Field Station (UHE-HY)
4) Université du Québec à Montréal, Groupe de Recherche en Écologie forestière interuniversitaire (GREFI)

Objective and description of the project:

The objective of the project is to test the theories of the structural scaling in plants and to study their implications on sharing of growth resources in pure and mixed stands of sun- and shade-adapted boreal tree species (Picea abies, Pinus sylvestris, Betula pendula, Acer saccharum, Betula alleghanienis, and Populus X wettsteinii). The results will be used to explain growth dynamics of mixed species tree communities. The growth resources considered are solar radiation and soil fertility. The project combines work on three themes in their respective working packages WP1, WP2 and WP3:

WP1 tests three theories of structural scaling (pipe model, allometric scaling, and functional branch analysis) that explain how attributes of organisms change with variation in their size with measurements on the three-dimensional root-stem-shoot system in these tree species. It further investigates how environmental factors and species composition affect the scaling parameters. These studies yield allocation patterns that can be utilized in modelling.

WP2 studies how the three-dimensional tree structure (represented by scaling parameters) affects resource capture and competitive resource sharing. This part is based on both experiments and modelling.

In WP3 two models LIGNUM and ACROBAS that deal with resource capture and growth at tree and stand level are modified on the basis of scaling parameters and results of experiments. They are used to study the implications of the interactions between above- and below-ground tree structure and the sharing of resources on mixed-stand development.

Associated to Metla's project 3342

 
   Päivitetty:    13.03.2009 /Metla/KBym Metla : SSCS    Palaute Metlan etusivulle
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