TREE COMMUNITY OF A PERMANENT FLOODED FOREST AND ITS ADJACENT VEGETATION AREA IN OURO PRETO, MINAS GERAIS STATE, BRAZIL

A presente investiga\ue7\ue3o teve como objetivo levantar a composi\ue7\ue3o flor\uedstica e a estrutura fitossociol\uf3gica da comunidade arb\uf3rea de uma mancha florestal permanentemente alagada, tamb\ue9m conhecida como Floresta Paludosa, e de sua vegeta\ue7\ue3o adjacente (Floresta Estacional Semidecidual Alto Montana) localizada no Parque Estadual do Itacolomi, Ouro Preto e Mariana, estado de Minas Gerais. O trecho estudado encontra-se a 1.350m de altitude, sendo o tipo clim\ue1tico ocorrente na regi\ue3o o Cwb, conforme a classifica\ue7\ue3o de K\uf6eppen, com pluviosidade m\ue9dia anual variando de 1.100mm a 1.800mm e temperatura m\ue9dia anual de 17,4 \ubaC a 19,8 \ubaC. Para o levantamento fitossociol\uf3gico foram alocadas quatorze parcelas (10m x 30m), sendo sete em cada fisionomia, nas quais foram amostrados todos os indiv\uedduos com CAP (circunfer\ueancia a altura do peito) 65 15cm. Foram amostrados 1.136 indiv\uedduos distribu\ueddos em 24 fam\uedlias, 37 g\ueaneros e 53 esp\ue9cies. As fam\uedlias com maior riqueza foram Myrtaceae (11), Melastomataceae (5) e Annonaceae, Asteraceae, Fabaceae e Rubiaceae (3). A similaridade entre os fragmentos pode ser considerada relativamente baixa e menor do que o esperado, revelando a exist\ueancia de unidades fitogeogr\ue1ficas individualizadas com caracter\uedsticas flor\uedsticas distintas. A influ\ueancia diferencial da forma\ue7\ue3o adjacente sob a vegeta\ue7\ue3o palud\uedcola pode ser o fator mais importante na diferencia\ue7\ue3o flor\uedstica deste fragmento florestal em rela\ue7\ue3o \ue0s diversas \ue1reas florestais alagadas montanas no Brasil.The present study aimed to raise the floristic composition and the phytosociological structure of the tree community of an permanent flooded swamp forest known as 'Floresta Padulosa' as well as its adjacent vegetation (semi-deciduous seasonal forest 'Alto Montana') in Itacolomi State Park, Ouro Preto and Mariana, Minas Gerais State, Brazil. The study site is located at an altitude of 1,350m, and the regional climate is classified as Cwb by K\uf6ppen's system, with average annual rainfall varying from 1.100mm to 1.800mm and the average annual temperature from 17.4 \ubaC to 19.8 \ubaC. In order to make the phytosociological survey 14 plots (10m X 30m) were located, seven in each physiognomy, and all individuals with a minimum CBH (Circunference at Breast Height) of 15cm were sampled. A total of 1136 individuals were sampled, belonging to 24 families, 37 genders and 53 species. The families with higher richness values were Myrtaceae (11), Melastomataceae (5) and Annonaceae, Fabaceae and Rubiaceae (3). The similarity among the studied fragments can be considered lower than expected, showing the existence of individual phytogeographic units, with distinct floristic characteristics. The influence of the adjacent vegetation on the swamp forest may be the most important factor in its floristic differentiation if compared to other swamps areas of Brazil