Abstract
The present work aims to determine the spatial distribution pattern of Protium Burm. f and the diametric structure of these species in a dense tropical submontane rainforest along the Sustainable Development Reserve (SDR) of the Iratapuru river. The area of study was divided into three plateau compartments called Mane Preto Sierra, Banco Grande Sierra and Alaska Sierra. In each plateau compartment it was settled a single area transect with 1,000 x 20 m, where DAP ≥ 10 cm of the entire Protium population within the transects was measured. The data was processed in the specific software Mata Nativa 2. There were inventoried Protium tenuifolium, Protium altsoni, Protium polybotryum subsp. blackii and Protium paniculatum var. riedelianum. Most individuals concentrated in smaller diametric classes, decreasing progressively to a lesser extent in larger classes. It can be concluded that the population has medium size and its vertical structure is characterized by the presence of three strata, however, its phytocenoses is defined by two clear constants: the first groups individuals of up to 15 m of height and forms the uniform and dominant stratum; the second is composed by emerging up to 35 m high and whose diameter structure shows a population in dynamic balance.
Highlights
Amazon Forest constitutes the primary dispersion center of Protium Burm f., the main gender of Burseraceae, with its species spread over tropical and subtropical regions in South America, part of Europe, Asia and Oceania (Fine, Daly, Muñoz, Mesones, & Cameron, 2005)
There were sampled 721 live Protium individuals, from which P. tenuifolium presented the highest number of individuals, 481, distributed in all areas, with density of 80.1 ind ha-1, average of 21.21 DBH, reaching the total basal area of 22.41 m2; followed by P. altsonii, with 143 individuals, registered in Mane Preto and Banco Grande complex, with density of 23.3 ind ha-1 and average of 22.67 DBH, totaling a basal area of 7.01 m2
P. paniculatum var. riedelianum occurred with 93 individuals distributed in all areas, with density of 15.5 ind ha-1, average of 21.07 DBH, reaching a basal area of 3.84 m2
Summary
Amazon Forest constitutes the primary dispersion center of Protium Burm f., the main gender of Burseraceae, with its species spread over tropical and subtropical regions in South America, part of Europe, Asia and Oceania (Fine, Daly, Muñoz, Mesones, & Cameron, 2005). This gender has large distribution in South America, with a great history of use and many species adapted to each type of environment. Its leaves are alternate and rarely opposite, compodes and odd pinnate and the flowers small and unissexual, of cream, yellow green or red colour; the fruits are drupe and more rarely capsules (Souza & Lorenzi, 2008)
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