Biomass equations for forest regrowth in the eastern Amazon using randomized branch sampling

Forest regrowth occupies an extensive and increasing area in the Amazon basin, but accurate assessment of the impact of regrowth on carbon and nutrient cycles has been hampered by a paucity of available allometric equations. We develop pooled and species-specific equations for total aboveground biomass for a study site in the eastern Amazon that had been abandoned for 15 years. Field work was conducted using randomized branch sampling, a rapid technique that has seen little use in tropical forests. High consistency of sample paths in randomized branch sampling, as measured by the standard error of individual paths (14%), suggests the method may provide substantial efficiencies when compared to traditional procedures. The best fitting equations in this study used the traditional form Y=a×DBHb, where Y is biomass, DBH is diameter at breast height, and a and b are both species-specific parameters. Species-specific equations of the form Y=a(BA×H), where Y is biomass, BA is tree basal area, H is tree height, and a is a species-specific parameter, fit almost as well. Comparison with previously published equations indicated errors from -33% to +29% would have occurred using off-site relationships. We also present equations for stemwood, twigs, and foliage as biomass components.

Bibliographic Details

Main Authors:	63516 Ducey, Mark Jonathan Professor da Universidade de New Haspshire, 133136 Zarin, Daniel Jacob (autor/a) Professor da Universidade da Flórida, 127324 Vanconcelos, Steel Silva (autor/a) Pesquisador da Embrapa Amazônia Oriental, 43651 Araújo, Maristela Machado (autor/a) Professora da Universidade federal de Santa María
Format:	Texto biblioteca
Language:	eng
Published:	Brasil Instituto Nacional de Pesquisas da Amazônia 2009
Subjects:	BIOMASA, BOSQUE TROPICAL, MUESTREO, MODELOS, ALOMETRIA, CICLO DEL CARBONO, ARBOLES, ESPECIES, MEDICION, ALTURA, DIAMETRO A LA ALTURA DE PECHO, ECUACIONES ALOMETRICAS, BIOMASA AEREA, REGENERACION, NUTRIENTES, ALLOMETRY, ALLOMETRIC EQUATIONS, SECONDARY GROWTH, TROPICAL FOREST, EQUAÇÕES ALOMÉTRICAS, CRESCIMENTO SECUNDÁRIO, FLORESTA TROPICAL,
Online Access:	http://orton.catie.ac.cr/repdoc/A11163i/A11163i.pdf https://acta.inpa.gov.br/fasciculos/39-2/PDF/v39n2a13.pdf
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