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Tree populations in natural tropical rain forests: A case study: Brazilian Amazonia

Tree populations in natural tropical rain forests: A case study: Brazilian Amazonia

Bois et Forets des Tropiques 1993(236): 43-56

ISSN/ISBN: 0006-579X

Is the assessment of the total population of a tree species of interest in tropical forests? To what extent is it possible? The populations of the main species are usually fairly well estimated through so-called commercial forest inventories. More detailed inventories are necessary to answer questions of different kinds: phytogeographic (definition of tree species, varieties, speciation): demographic (structures of all tree species, spatial distributions, stability); conservationist (identification of rare species; basis for a policy of nature protection). Tree populations can be assessed only through large inventories and adequate sampling designs requiring important financial resources. Such inventories are few. An example of tree population assessment with 0.001% intensity is given for Brazilian Amazonia owing to the availability of data from the Projecto Radam Brasil. Populations are studied on about 620 000 km-2 for all trees 100 cm GBH and over (558 species). In addition the populations of five selected tree species are studied in the whole central portion of Brazilian Amazonia, i.e. about 2 300 000 km-2.

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Accession: 009674957

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