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The aim of the work presented here was to either use existing forest dynamic simulation models or calibrate a new one both within the SYMFOR framework with the purpose of examining changes in stand level basal area and functional composition in response to selective logging considering trees > 10 cm d.b.h for two areas of undisturbed Amazonian non flooded tropical forest in Brazil and one in Peru. Model biological realism was evaluated for forest in the undisturbed and selectively logged state and it was concluded that forest dynamics were realistically represented. Results of the logging simulation experiments showed that in relation to undisturbed forest simulation subject to no form of harvesting intervention there was a significant amount of change over a 90 year simulation period that was positively proportional to the intensity of logging. Areas which had in the dynamic equilibrium of undisturbed forest a greater proportion of a specific ecological guild of trees known as the light hardwoods (LHW’s) seemed to respond more favorably in terms of less deviation but only within a specific range of baseline forest composition beyond which compositional diversity became more important. These finds are in line partially with practical management experience and partiality basic systematics theory respectively., {"references":["","J.M.E. 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The aim of this study was to examine the dynamics of functional composition of a non flooded Amazonian forest in response to drought stress in terms of diameter growth, recruitment and mortality. The survey was carried out in the continuous forest of the Biological dynamics of forest fragments project 90 km outside the city of Manaus, state of Amazonas Brazil. All stems >10 cm dbh where identified to species level and monitored in 18 one hectare permanent sample plots from 1981 to 2004.For statistical analysis all species where aggregated in three ecological guilds. Two distinct drought events occurred in 1983 and 1997. Results showed that more early successional species performed better than later successional ones. 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The large diversity of tree species of tropical moist forests relative to temperate zones and their biomass storage capacity and how these are maintained over extended periods of time have been subjects of particular interest. Simulation models of forest dynamics are increasingly used to gain insights regarding the long term effect of both direct and indirect anthropogenic impacts on these forests. If such models cannot maintain a stable coexistence of species and biomass dynamics in undisturbed forest simulations modeling results might be misleading with potentially deleterious implications. An effort is described, based on a nested experimental design by use of simulation modeling and examination of long term permanent sample plots data (PSP's) along with climatic records that had the objective to assess the importance of periodic drought disturbance in the maintenance of compositional and biomass stability over a 100-year period on the dynamics of the primary forest and on the sustainability of timber harvesting in the tropical non flooded forests of the Amazon basin. This is done using two separately recalibrated models within the SYMFOR modeling framework. It is shown that periodic drought stress within the limits of natural environmental fluctuation can have a significant influence on the simulated biomass dynamics of these forests considering trees>10 cm dbh but not on the dynamics of functional composition. Implications of these were found to be highly significant.