02708nam a2200289 a 450000100080000000500110000800800410001910000270006024500920008726000430017930000100022250000200023252019270025265000120217965000220219165000120221365000250222565000150225065000130226565000260227865300090230465300230231365300210233665300210235765300190237865300210239713054592006-12-13       2000    bl uuuu  m   00u1 u    #d1 aOLIVEIRA, M. V. N. d'.  aSubstainable forest management for small farmers in Acre state in the Brazilian Amazon.  aAberdeen: University of Aberdeenc2000  a167p.  aTese Doutorado.  aThis thesis has the aim of presenting a forest management system to be applied on small farms, especially in the settlement projects of the Brazilian Amazon, and to examine its sustainability by investigating the responses of the forest in terms of the changes in natural regeneration in felling gaps and the dynamics of the residual trees. Using the program CAFOGROM, an additional aim was to simulate the forest responses to different cycle lengths, harvesting intensities and silvicultural treatments to determine the theoretical optimum combination of these parameters. The proposed forest management system was designed to generate a new source of family income and to maintain the structure and biodiversity of the legal forest reserves. The system is new in three main characteristics: the use of short cycles in the management of tropical forest, the low harvesting intensity and environmental impact and the direct involvement of the local population in all forest management activities. It is based on a minimum felling cycle of ten years and an annual harvest of... The gaps produced by logging in PC Peixoto can be classified as small or less often medium sized (canopy openness from  10% to 25%). Differences in gap size and canopy openness produced significant differences in the growth rates, species richness and species diversity of seedlings established in the gaps. Mortality rates of seedlings in the artificial gaps increased and recruitment rates decreased with increasing gap size. The density and recruitment of seedlings of commercial species was not different between gap sizes, but gap creation increased the growth rate of the seedlings of these species. Small and medium gaps (less than 25% canopy openness) improved regeneration from the forest management point of view, with fewer pioneer plants, higher diversity and lower mortality, although they resulted in lower seedling growth rates...  afarmers  aforest management  aforests  anatural regeneration  aAgricultor  aFloresta  aRegeneração Natural  aAcre  aAssentamento Rural  aManejo Florestal  aRural settlement  aSustainability  aSustentabilidade