Above-ground biomass and productivity in a rain forest of eastern South America :

The dynamics of tropical forest woody plants was studied at the Nouragues Field Station, central French Guiana. Stem density, basal area, above-ground biomass and above-ground net primary productivity, including the contribution of litterfall, were estimated from two large permanent census plots of 12 and 10 ha, established on contrasting soil types, and censused twice, first in 1992–1994, then again in 2000–2002. Using a correlation between wood density and wood hardness directly measured by a Pilodyn wood tester, we found that the mean wood density was 0.63 g cm−3, 12% smaller than the mean of wood density estimated from the literature values for the species occurring in our plot. Above-ground biomass ranged from 356 to 398 Mg ha−1 (oven-dry mass), and it increased over the census period. Coarse wood productivity (stem growth plus recruitment) contributed to 4.16 MgC ha−1 y−1. Litterfall contributed to 4.65 MgC ha−1 y−1 with 3.16 MgC ha−1 y−1 due to leaves, 1.10 MgC ha−1 y−1 to twigs, and 0.39 MgC ha−1 y−1 to fruits and flowers. The increase in above-ground biomass for both trees and lianas is consistent with the hypothesis of a shift in the functioning of Amazonian rain forests driven by environmental changes, although alternative hypotheses such as a recovery from past disturbances cannot be ruled out at our site, as suggested by the observed decrease in stem density.

Bibliographic Details

Main Authors:	56791 Chave, Jérôme Laboratoire Evolution et Diversit´e Biologique. CNRS/UPS, 49888 Bongers, Frans (autor/a) Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, Wageningen University, 57638 Châtelet, Patrick (autor/a) CNRS-Guyane UPS 2651, Station d'Etudes des Nouragues, 56604 Charles Dominique, Pierre (autor/a) CNRS-Guyane UPS 2651, Station d'Etudes des Nouragues, 101024 Oliver, Jean (autor/a) Laboratoire Evolution et Diversit´e Biologique, CNRS/UPS, 68497 Forget, Pierre Michel (autor/a) D´epartement Ecologie et Gestion de la Biodiversit´e, 127240 Van der Meer, Peter (autor/a) Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, Wageningen University, 99672 Norden, Natalia (autor/a) Laboratoire Evolution et Diversit´e Biologique, CNRS/UPS, 111314 Riéra, Bernard (autor/a) D´epartement Ecologie et Gestion de la Biodiversit´e
Format:	Texto biblioteca
Language:	eng
Published:	Reino Unido Cambridge University Press 2008
Subjects:	BIOMASA, BIOMASA AEREA, PLANTAS LEÑOSAS, BOSQUE TROPICAL, PRODUCTIVIDAD PRIMARIA NETA, ECUACIONES ALOMETRICAS, CARBONO, MODELOS, MADERA, MEDICION, HOJARASCA, TIPOS DE SUELOS,
Online Access:	http://orton.catie.ac.cr/repdoc/A11110i/A11110i.pdf https://www.cambridge.org/core/journals/journal-of-tropical-ecology/article/aboveground-biomass-and-productivity-in-a-rain-forest-of-eastern-south-america/140386EA5195ADD5C28C681CC7D27944
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