EVALUATION OF A METHOD OF SILVIGENIC ANALYSIS IN CERRAD\uc3O

The method \u201cline-intercept sampling method of canopy trees\u201d was applied to map the silvigenic mosaic of a patch of 5.12 ha in a cerrad\ue3o at Esta\ue7\ue3o Ecol\uf3gica de Assis, in S\ue3o Paulo state, aiming to verify its applicability in estimating the conservation status and to show the regeneration processes in this type of forest with open canopy. We also analyzed the distribution of shade tolerant or intolerant species among the categories of eco-unities. The mosaic comprised five tree fall gaps (eco-unities in reorganization) and 1,296 individuals, 845 of which in eco-unities in equilibrium, 241 in development, and 210 degrading. The predominance of eco-units in equilibrium 2B (tall trees with low pole) is coherent with the open canopy. The shade intolerant species Vochysia tucanorum , Xylopia aromatica , and Plenckia populnea presented occurred preferably in starting eco-units of silvigenesis. But most of the species, especially the shade tolerant ones, did not present any correlation with eco-unit categories. The method revealed the maturity and the good architectural conservation status of the studied cerrad\ue3o. We noticed that there may be overlapping of ecounities in development and degrading when this latter one is delimited by dead standing trees that allow the growth of young individuals around themO m\ue9todo \u201cinvent\ue1rio de \ue1rvores de dossel por intercepta\ue7\ue3o de linhas\u201d foi aplicado para mapear o mosaico silvig\ueanico em uma \ue1rea de 5,12 ha de cerrad\ue3o na Esta\ue7\ue3o Ecol\uf3gica de Assis (SP), e avaliado quanto \ue0 sua aplicabilidade para estimar o grau de conserva\ue7\ue3o e para evidenciar os processos de regenera\ue7\ue3o neste tipo de floresta com dossel aberto. Tamb\ue9m foi avaliada a distribui\ue7\ue3o de esp\ue9cies tolerantes ou intolerantes \ue0 sombra entre as categorias de ecounidades. O mosaico compreendeu cinco clareiras (ecounidades em reorganiza\ue7\ue3o) e 1296 indiv\uedduos, sendo 845 em ecounidades em equil\uedbrio, 241 em desenvolvimento, e 210 em degrada\ue7\ue3o. Coerentemente com o dossel aberto induzindo reitera\ue7\ue3o precoce, predominaram as ecounidades em equil\uedbrio 2B (\ue1rvores altas com fuste baixo). Vochysia tucanorum Mart., Xylopia aromatica (Lam.) Mart. E Plenckia populnea Reissek, esp\ue9cies intolerantes \ue0 sombra, ocorreram preferencialmente em ecounidades iniciais da silvig\ueanese. Mas, a maioria das esp\ue9cies, principalmente as tolerantes \ue0 sombra, n\ue3o se associou com quaisquer categorias de ecounidades. O m\ue9todo evidenciou a maturidade e o bom estado de conserva\ue7\ue3o arquitetural do cerrad\ue3o estudado. O estudo mostrou que pode haver sobreposi\ue7\ue3o de ecounidades em desenvolvimento e em degrada\ue7\ue3o quando estas \ufaltimas s\ue3o delineadas por \ue1rvores mortas em p\ue9 que permitem o crescimento de indiv\uedduos jovens ao redor delas