Simulation der Waldlueckendynamik tropischer Naturwaelder mit einem vertikal und horizontal strukturierten Prozessmodell

1992

14 Lit. Ang.

Unselbständiges Werk

4733

200052781

A systems analysis of tree growth in a tropical rain forest was carried out to develop the simulation model FORMIX for representing inherent growth dynamics of tropical forests and assessing the consequences of logging strategies currently applied. Emphasis was put on a correct representation of the physiological processes mainly involved in the temporal development of biomass growth within a forest gap of a typical size of 100-400 Quadratmeter. On the gap level the model distinguishes between five canopy layers containing seedlings, saplings, poles, main canopy trees, and emergents. It comprises submodels for the light attenuation within the crowns, photoproduction, respiration, biomass turnover, deadwood losses, tree mortality, growth, and fructification. An imaginary forest was constructed connecting several of such gap models and including interrelations between them caused by fallen dead trees and seed dispersal. For simulation, the model was preliminarily parametrized using data for lowland dipterocarp forests in West-Malaysia. Simulation runs showed that there is an internal regeneration cycle determining growth of tropical forests. Logging operations - especially their frequency and intensity - were judged in the light of this 'eigendynamics'. In addition to this first application, the model can be used to determine lacks in empirical data, to integrate empirical results of different disciplines, and to check the consistency of given data sets.