O papel da competição por luz e da troca de nutrientes na interação entre plantas

Abstract

At this work we present two models to describe de growth dynamics of interacting plants. The first system that we have used describes de water dynamics, and then relates it with the cations in the ground and with the biomass dynamics. The interaction between plants that this model describes is via light competition. The second model describes the evolution of the biomass through processes of transport, resistance and allocation of nutrients at the vegetal tissue. At this model we realized two extensions in order to describe the interaction, both based in the phosphorous exchange between the radicular systems. These exchanges are promoted by micorriza fungi, which the roots perform a mutualism process. The extensions, or interaction way, are based on the form in which the phosphorous is transported, in the sense of occurrence or not of the mass conservation. In all the simulations realized, the results are the temporal evolutions of the vegetal biomasses, which are divided in belowground biomass and aboveground biomass. Our simulations were done by sets of two or three plants of different species, where each specie was calculated at the first moment in a non coupled form. This way we could compare the results obtained with and without interactions. The parameterizations were done based at existing models that are utilized in each extension. Our results were good enough, when compared to another phenomenological results in the literature.