Data/hora: 24/06/2024 14:19:13

Biblioteca(s): 	Embrapa Amazônia Ocidental.	
Data corrente: 	20/02/2000	
Data da última atualização: 	05/01/2015	
Autoria: 	NELSON, B. W.; MESQUITA, R.; PEREIRA, J. L. G.; SOUZA, S. G. A. de; BATISTA, G. T.; COUTO, L. B.	
Afiliação: 	INPA; Embrapa Amazonia Ocidental; INPE.	
Título: 	Allometric regressions for improved estimate of secondary forest biomass in the central Amazon.	
Ano de publicação: 	1999	
Fonte/Imprenta: 	Forest Ecology and Management, v. 117, n. 1, p. 149-167, 1999.	
Idioma: 	Inglês	
Conteúdo: 	Estimates of the sequestering of carbon by secondary of forests - wich occupy almost half the deforested area of the Brazilian Amazon - will be improved by the use of accurate allometric relationships for non-destructive measurement of standing biomass and by an evaluation of the suitability of existing equations for application in secondary forest. Species-specific and mixed-species regressions for estimating total above-ground dry weight (DW) were therefore developed using eight abundant secondary forest tree species in the central Amazon. Using only DBH as the input variable, the species-specific equations estimated DW of individual trees an average error of 10%-15%. For the mixed-species equations, developed using 132trees from seven of the wight species (excluding Cecropia, average error in estimating DW of individual trees was 19.8% using only DBH and 15.0% using DBH plus specific density of the wood (SD). Average SD for each species can be substituted without increasing the error of the estimate. Adding total tree hight (H) as an input variable provided only a slight reduction in error to 14.0%. Previously plublished mixed-species biomass regression models, based on primary and secondary forest trees of the Amazon, were also cross-valited against the trees of this study. Two of these models, based on primary forest plots and using only DBH as an input, overstimated biomass by 10%-60% for central Amazonian secondary of forest trees in the size range 5cm-25cm. The overstimate was greatest for the larger trees. Including Cecropia in the test group will make the overstimate even greater. Those published equation using DBH, H. and SD as inputs, wheter from secondary or primary forest plots, showed better agreement with the sample-derived regressions and lower average erros in estimation of individual tree dry weights.	
Palavras-Chave: 	Amazonas; Brasil; Manaus; Secondary forest.	
Thesagro: 	Biomassa; Carbono; Floresta Tropical Úmida.	
Thesaurus Nal: 	biomass; carbon; tropical rain forests.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Amazônia Ocidental (CPAA)	
Exemplares: 	CPAA - (4458-1) - UPC - AP - PP - S8253 -  - S8253 - DIS