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On the implementation of the functional-structural tree model LIGNUM

The functional-structural tree model LIGNUM represents the tree crown for coniferous and deciduous trees with four structural units. The units are tree segment, branching point, bud and axis. LIGNUM is intended as a generic modeling tool for woody perennial plants (Perttunen et. al., 1996, Perttunen et. al., 2001) and shrubs (Salemaa et. al., 2003). The growth of different species is simulated by changing model parameters, descriptions of metabolism and structural dynamics (birth, growth and senescence of the structural units) and the tree architecture is represented with Lindenmayer systems (Perttunen and Sievänen, 2005). Photosynthetic production depends on the photosynthetically active solar radiation in the tree crown.