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Information about growth of trees and forests

Ongoing Research on LIGNUM


LIGNUM is being applied in a number of research projects:

  1. LIGNUM is being used in SSCS project funded by Academy of Finland. It is used as a tool results of field experiments to synthesize.

  2. LIGNUM is applied in study of structural development of shrubs (bearberry and cowberry)

  3. The project "Wounds and decays of urban trees" uses a tool based on LIGNUM model to manage and analyse data from field experiments.
    Pictures 1, 2, 3, 4

  4. At University of Quebec in Montreal LIGNUM is being used to find the distribution of leaf traits that maximized whole plant gross carbon gain when both leaf maximum photosynthesis and leaf orientation are allowed to vary with the light environment.

  5. Work is underway with Dr. Sven Mutke (Universidad Politecnica de Madrid) model crown architecture of a grafted Stone pine (Stone pine is cultivated for edible seeds that are collected for export e.g. in rural Spain).

  6. LIGNUM has been applied in the growth simulation of short-rotation Eastern cottonwood (Dr Miaoer Lo and Dr. Pekka Nygren, University of Missouri).

  7. During the summer 2006 a tool called "LIGNUM Workbench" was implemented, where the models created with LIGNUM can be saved in XML file format, visualized and analyzed.

  8. Dr. Sylvain Delagrange (Professeur associé l'UQO, IQAFF, Quebec) is using LIGNUM to model sugar maple sapling survival.


Previous projects

To allow formal definitions of architectural development of trees the LIGNUM model has adopted Lindenmayer system language L. The language L extends current L-system languages to include structures. The definition of L and the initial parser of the language was done in cooperation with Prof. Przemyslaw Prusinkiewicz, University of Calgary.

At Metla, LIGNUM has been developed in the project "Decision Support System for Stand management".

LIGNUM has been developed in the project "Structural Dynamics in a Hierarchical System: Mathematical and Computational Methods for Forest Growth Models", financed by Academy of Finland and lead by Annikki Mäkelä.

LIGNUM is used in a Canadian project "Modelling of biological and silvicultural factors affecting sapling growth and survival in managed birch-beech-sugar maple stands". The canadian partners are working at GREF Research Unit at University of Quebec in Montreal and McGill University (Montreal). The head of the project is Prof. Christian Messier at University of Quebec.

The project "Functional organization of the mountain birch and the effect of herbivory on it", at the Department of Biology, Section of Ecology of University of Turku studies the inteplay of 3D tree structure, tree functioning, and browsing by herbivory in tree development. Lignum was used as the tool (model) intregrating these factors. Kai Ruohomäki and Pekka Kaitaniemi are the principal scientists in Turku. The project will run the years 1999-2001.

In February 1999 started the cooperation with Prof. Przemyslaw Prusinkiewicz, University of Calgary by defining the Language L that extends current so called Lindenmayer system language to include structures. The parser for this language has beenimplemented in his laboratory and the adaptation for Lignum has been reported 2005.

Cooperation is going on with the Plant modelling group at University of Göttingen (lead by Dr Winfried Kurth) on building an interface between (L-system based) plant modeling system GROGRA and LIGNUM.




Updated: 09.08.2010 /UHel  |  Photo: Erkki Oksanen, Metla, unless otherwise stated  |  Copyright Metla  |  Feedback