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Título: Edge effects on litterfall mass and nutrient concentrations in forest fragments in central Amazonia
Autor(es): Nigel Christopher Sizer
Edmund V. J. Tanner
Isolde Dorothea Kossmann Ferraz
Assunto: Fragmento Florestal
Fatores Ambientais
ISSN: 0266-4674
Revista: Journal of Tropical Ecology
Volume: 16
Resumo: A study was conducted during June 1990 to January 1994, in a 100 ha lowland evergreen rain forest fragment at Dimona, north of Manaus, Amazonas State, Brazil to investigate whether the rate of litterfall changes near to the edge of a new forest fragment, and whether the litter falling near the fragment edge has a higher nutrient concentration compared to that falling in the interior. The dominant tree families were Lecythidaceae, Sapotaceae, Burseraceae and Leguminosae with a relatively open understorey dominated by palms e.g. Astrocaryum, Bactris and Syagrus. Forest edges bordering on pasture were created by cutting and burning the surrounding Amazonian lowland rain forest in the dry season (June) of 1990. Litterfall was measured for 3.5 years along transects 10, 50, 100 or 250 m into the forest from the forest edge. Litterfall along the l0 m transects increased by up to 2.5 times that on spatial controls (250 m transects) in the dry season in which the edge was created. In the second dry season after edge creation litterfall at l0 m was lower than on controls, after which it returned to control rates in the second wet season, 1.5 years after edge creation. Litterfall 50 m into the forest was less affected, there being a smaller rise in the dry season in which the edge was cut, and no significant effects after that. At l00 m there was no effect of edge creation on litterfall. Phosphorus concentrations in litterfall were elevated along l0 m transects, 10-12 weeks after edge creation, possibly because of reduced retranslocation prior to abscission. Nitrogen and potassium content were unaffected. It is suggested that the changes in litterfall described here are inextricably linked to the biomass collapse which occurs near forest-fragment edges in the same area.
ISSN: 0266-4674
Local de publicação: Inglaterra
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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