Modeling the circulation of biomass in stem present in fragments of vegetation affected by urban environmental impacts

Abstract

The functioning of ecosystems can be modeled through knowledge of the processes that are critical to their own controls, as well as through the validation of each modeling equation through field observation and experimentation. It was adopted as a hypothesis that the mass flow in the studied forest fragment was in a state of homeorhetic equilibrium. For sampling evaluation, the approach chosen was that of random processes. The choice was for the two-stage sampling process, where the second stage of sampling is restricted or dependent on the first stage. The main advantage is the reduction of costs resulting from the concentration of sub-sampling within the primary units. Two main pathway sequences were observed in the analyzed model: C1-C3-C7-C4-C5-C2-C1 and C1-C8-C9. The first represents the flow through vegetation - which represents about 90% - and, the second, the flow through animal populations - which presents about 10%. When comparing the transfer coefficients, it is possible to notice that the most significant are between the litter exit (C3) for detritivores (3.7) and for the soil (3.4) entrances (2.1) in the leaves (C1) from the stems (c2 ) and entry into herbivores (C8) from leaves (1.8) and fruits (6.3).