Wood density of trees in black water floodplains of Rio Jaú National Park, Amazonia, Brazil

Worbes, Martin

doi:10.1590/1809-43922000303448

Cited by 27 publications

(15 citation statements)

References 8 publications

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“…Most estimates of density for studies of wood technology and ecology in the region only report forest species. This is due to the great interest in characterizing wood for commercial uses (Souza et al, 1997) or in differentiating systems based on the intrinsic attributes of their arboreal components (Worbes, 1989;Parolin and Ferreira, 1998;Parolin and Worbes, 2000). However, wood density is an important component in calculations of total biomass in forest ecosystems and in savannas, and is therefore a key variable for calculating greenhouse gas emissions from land-use changes in Amazonia.…”

Section: Discussionmentioning

confidence: 99%

“…Latitudinal differences in relief or in structure can directly affect the density of the wood in forest trees (Williamson, 1984). Parolin and Worbes (2000) tentatively concluded that some identical species growing in different Amazon flooded forest environments (white water and black water) have different absolute densities. However, even with the three ecosystems that are the subject of the present study (Sg, Sp and Tp) having different relief gradients and soil types, this was not indicative of statistically significant differences (ANOVA) for the two most-common arboreal species.…”

Section: Discussionmentioning

confidence: 99%

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Wood density of trees in open savannas of the Brazilian Amazon

Barbosa

Fearnside

2004

Forest Ecology and Management

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Wood density of trees in open savannas of the Brazilian Amazon

Barbosa

Fearnside

2004

Forest Ecology and Management

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“…1990;INPA 1991;Lorenzi 1992;Malavassi 1992;Favrichon 1994Favrichon , 1995King 1996;Brown 1997;Fearnside 1997;Parolin & Worbes 2000;ter Steege & Hammond 2001). Literature values given as wood density at 12 percent moisture content iyVD-^^ were converted to basic wood specific gravity values (SGi,^¡¡¡) using the equation S^hasic ~ 0.861 WDj2, based on 463 values from Sallenave (1971).…”

Section: Methods Study Sitesmentioning

confidence: 99%

Interspecific and Inter-site Variation in Wood Specific Gravity of Tropical Trees1

Muller-Landau¹

2004

Biotrop

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Variation in climate and soils results in inter-site differences in the assemblages of tree life history strategies within a community, which has important implications for ecosystem structure and dynamics. I investigated interspecific and inter-site variation in wood specific gravity•an easily measured indicator of tree life history strategy•in four Neotropical forests and analyzed its correlates. Mean wood specific gravity (oven-dry weight divided by fresh volume, sometimes also referred to as wood density in the literature) differed significantly among sites, varying inversely with soil fertility and independently of rainfall, seasonality, and temperature. Mean wood specific gravity values were much higher at Kilometer 41, Manaus, Brazil, where soils are extremely poor, than at Cocha Cashu, Peru, Barro Colorado Island, Panama, or La Selva, Costa Rica, where soils are better and mortality rates of trees are higher. Within sites, wood specific gravity varied widely among species. On Barro Colorado Island, among-species variation was significantly, albeit weakly, negatively correlated with sapling and tree mortality and relative growth rates. Altogether, the results suggest that the distribution of tree life history strategies in a community varies substantially among sites, with important consequences for community and ecosystem properties such as aboveground carbon stores. RESUMENLa variación climática y edáfica da lugar a diferencias entre sitios con respecto a los ensambles de las estrategias de historia de vida de los árboles de una comunidad, lo cual tiene consecuencias importantes para la estructura y la dinámica del ecosistema. Investigué la variación interespecífica y espacial en la gravedad específica de la Madera•un indicador de fácil medición de la estrategia de historia de vida de los árboles•en cuatro bosques neotropicales y analizé sus factores asociados. La gravedad específica media de la madera (el peso seco dividido por el volumen fresco, frecuentemente llamado "densidad de la madera" en la literatura ecológica) fue significativamente diferente entre sitios, variando inversamente con la fertilidad del suelo, e independientemente de la precipitación, la estacionalidad, y la temperatura. La gravedad específica media de la madera fue mucho más alta en Kilómetro 41, Manaus, Brasil, donde los suelos son extremadamente pobres, en comparación con Cocha Cashu, Perú, Barro Colorado, Panamá, o La Selva, Costa Rica, donde los suelos son mejores y las tasas de mortalidad de los árboles son más altas. Dentro de los sitios, la gravedad específica de la madera varió extensamente entre especies. En Barro Colorado, la variación entre especies estuvo correlacionada negativamente, aunque sólo débilmente, con las tasas de mortalidad y de crecimiento relativo de los árboles juveniles y adultos. En conjunto, los resultados sugieren que la distribución de las estrategias de historia de vida de los árboles en una comunidad varía sustancialmente entre sitios, con consecuencias importantes para características c...

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“…As investigações básicas sobre este parâmetro ecológico na Amazônia tomaram maior impulso ao final da década de 1990 com Parolin & Ferreira (1998) e Parolin & Worbes (2000), discutindo diferenças da densidade da madeira entre sistemas de várzea e igapó. Entretanto, estudos mais recentes como os de Nogueira et al (2003; para sistemas florestais e, Barbosa (2001) e Barbosa & Fearnside (2004), para não florestais (savanas), vem discutindo a necessidade de novas investigações e adaptações ao método de determinação da densidade básica da madeira para processos de transformação de dados volumétricos para biomassa.…”

Section: Introductionunclassified

Densidade básica da madeira de um ecossistema de "campina" em Roraima, Amazônia brasileira

Barbosa

Ferreira

2004

Acta Amaz.

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RESUMODensidade básica (g.cm -3 : peso seco / volume úmido) da madeira foi determinada para 13 das principais espécies arbóreo-arbustivas de um ecossistema de "campina" (caatinga amazônica) situado em Roraima, extremo norte da Amazônia brasileira. As amostras de madeira para o cálculo da densidade básica de cada espécie foram compostas por "discos amostrais" (casca, alburno e cerne) de diferentes classes diamétricas. No total, foram amostrados 98 indivíduos, perfazendo 150 peças de madeira (52 com diâmetro < 1,6cm; 63 entre 1,6-3,2cm, 27 entre 3,2-4,8cm e 8 > 4,8cm). A espécie de maior densidade média foi Matayba arborescens (Aubl.) Radlk. (0,68 g.cm (1,6-3,2cm), 0,67 ± 0,06 g.cm . Este resultado é 15,2% inferior ao comumente utilizado para transformação de volume de madeira em biomassa para ecossistemas de "campina" na Amazônia, influenciando diretamente nos cálculos de emissão de gases do efeito estufa. PALAVRAS-CHAVEcampina, caatinga amazônica, densidade básica da madeira, Roraima, Amazônia.Wood density of trees in a "campina" ecosystem in Roraima, Brazilian Amazonia. ABSTRACTWood density (g.cm -3 : oven-dry weight / wet volume) was determined for 13 of the main tree species of a "campina" ecosystem (Amazon caatinga) located in Roraima, north portion of Brazilian Amazonia. The wood samples for calculation of the density of each species were "sample disks" (bark, sapwood and heartwood) of different diameter classes. In total, 98 individuals were sampled in 150 wood pieces (52 with diameter < 1.6cm; 63 to 1.6-3.2cm, 27 to 3.2-4.8cm and 8 > 4.8cm (< 1.6cm), 0.64 ± 0.08 g.cm -3 (1. 6-3.2cm), 0.67 ± 0.06 g.cm -3 (3.2-4.8cm) and 0.69 ± 0.10 g.cm -3 (> 4.8cm). The weighted mean by biomass of the ecosystem was 0. 64 ± 0.08 g.cm -3 . This result is lower by 15.2% than that presently used for transformation of wood volume in biomass for "campina" ecosystems in Amazonia, influencing directly in the calculations of greenhouse gas emissions. KEY WORDS" INTRODUÇÃODensidade da madeira é um dos fatores chave em cálculos de biomassa (Brown, 1997;Woodcock, 2000) e estimativas de emissão de gases do efeito estufa (Fearnside, 1997). A densidade básica é a relação entre o peso seco e o volume saturado da madeira (Trugilho et al., 1990;Souza et al., 1997), sendo comumente utilizada na conversão de dados volumétricos em biomassa devido ao uso do "volume-verde" como base (Barbosa & Fearnside, 2004), implicando em uma boa relação de transformação. Este procedimento é importante para um melhor aproveitamento dos inventários florestais volumétricos de larga escala na Amazônia como, por exemplo, os do Projeto RADAMBRASIL (Brasil, 1973-83), pois auxiliam na quantificação da emissão de gases do efeito estufa pelo corte e queima da biomassa dos diferentes ecossistemas regionais.

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Wood density of trees in black water floodplains of Rio Jaú National Park, Amazonia, Brazil

Cited by 27 publications

References 8 publications

Wood density of trees in open savannas of the Brazilian Amazon

Wood density of trees in open savannas of the Brazilian Amazon

Interspecific and Inter-site Variation in Wood Specific Gravity of Tropical Trees1

Densidade básica da madeira de um ecossistema de "campina" em Roraima, Amazônia brasileira

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