Estrutura da floresta equatorial úmida da Estacao Experimental de Silvicultura Tropical do INPA

The structure of equatorial rainforest on the Tropical Silviculture Experimental Station (EEST) of the Instituto Nacional de Pesquisas da Amazonia was analysed with regard to abundance, frequency, dominance, natural regeneration, sociological-position parameters and a modified "Amplified Importance Value Index (IVIA)", the "Economically - Amplified Importance Value Index (IVIEA)". 8 plots 20 m x 500 m oriented north - south and east - west were sampled, measuring all plants ó 20 cm DBH; 24 subplots of 10 m x 100 m, measuring all plants larger than 5 cm and less than 20 cm DBH; and 5 subplots of 2 m x 10 m within each of the previous subplots for plants taller than 10 cm, but < 5 cm DBH. The minimum numbers of sample plots for each size category are 22, 6 and 2 respectively for floristic sampling and 80,18 and 6 respectively for quantitative sampling. All plants less than 20 cm DBH were considered stocking and were analysed as natural regeneration of the tree species larger than 20 cm DBH. The forest is floristically heterogeneous, with 324 species in 173 genera and 57 families recorded from plots. There was a mean of 8 individuals per species. In natural regeneration individuals of the families Burseraceae, Annonaceae, Rubiaceae and Violaceae predominate, but in mature stand Lecythidaceae, Sapotaceae, Euphorbiaceae and Caesalpiniaceae predominate. Only a few tree species such as Matamatá amarelo (Eschweilera odora), ripeiro vermelho (Corithophora alta), breu vermelho (Protium apiculatum) and abiurana abiu (Radlkoferella sp.) were found in climax communities. Matamatá amarelo (E. odora) is the most important species in the forest structure, in terms of IVIEA. Lianas, palms, herbs, and bushes may be important competitors of tree species regenerating in the understory. Of the 50 species listed for the INPA project "Ecological Management and Exploitation of the Humid Tropical Forest", only 19 had IVIEA's sufficiently high to indicate that they are suitable for sustained management. The autor concludes that it is useful to combine timber quality with the structure analysis but care should be taken not to put undue emphasis only values of IVIEA that area very high or very low because of the influence of a single parameter. The forest at EEST has the regular diametric structure caused by the large numbers of understory species with DBHs less than 40 cm. This results in low values of basal area (x = 25,01 m2/ha) and low volume with bark (x = 288,67 m3/ha). There are a mean of 72.885 individuals with DBH < 20 cm and a mean of 246,75 individuals with DBHó 20 cm per hectare.

Bibliographic Details

Main Authors:	80611 Jardim, F.C. da S., 12116 Instituto Nacional de Pesquisas da Amazonia, Manaus, AM (Brasil). Dept. de Silvicultura Tropical
Format:	biblioteca
Published:	Manaus, AM (Brasil) [198
Subjects:	CARACTERISTICAS DEL SITIO, ESTRUCTURA DEL BOSQUE, COMPOSICION BOTANICA, REGENERACION NATURAL, MUESTREO, MEDICION, DENSIDAD DE LA POBLACION, BOSQUE TROPICAL HUMEDO, BRASIL,
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