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Above- and below-ground net primary productivity across ten Amazonian forests on contrasting soils

Aragao, L. E. O. C. and Malhi, Y. and Metcalfe, D. B. and Silva-Espejo, J. E. and Jiménez, Eliana and Navarrete, D. and Almeida, S. and Costa, A. C. L. and Salinas, N. and Phillips, O. L. and Anderson, L. O. and Álvarez, E. and Baker, T. R. and Goncalvez, P. H. and Huamán-Ovalle, J. and Mamani-Solórzano, M. and Meir, P. and Monteagudo, A. and Patiño, Sandra and Peñuela, Maria Cristina and Prieto, A. and Quesada, C. A. and Rozas-Dávila, A. and Rudas, A. and Silva Jr., J. A. and Vásquez, R. (2009) Above- and below-ground net primary productivity across ten Amazonian forests on contrasting soils. Biogeosciences, 6 . pp. 2759-2778. ISSN 17264170

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Resumen

The net primary productivity (NPP) of tropical forests is one of the most important and least quantified components of the global carbon cycle. Most relevant studies have focused particularly on the quantification of the above-ground coarse wood productivity, and little is known about the carbon fluxes involved in other elements of the NPP, the partitioning of total NPP between its above- and below-ground components and the main environmental drivers of these patterns. In this study we quantify the above- and below-ground NPP of ten Amazonian forests to address two questions: (1) How do Amazonian forests allocate productivity among its above- and below-ground components? (2) How do soil and leaf nutrient status and soil texture affect the productivity of Amazonian forests? Using a standardized methodology to measure the major elements of productivity, we show that NPP varies between 9.3±1.3MgC ha−1 yr−1 (mean±standard error), at a white sand plot, and 17.0±1.4MgC ha−1 yr−1 at a very fertile Terra Preta site, with an overall average of 12.8±0.9MgC ha−1 yr−1. The studied forests allocate on average 64±3% and 36±3% of the total NPP to the aboveand below-ground components, respectively. The ratio of above-ground and below-ground NPP is almost invariant with total NPP. Litterfall and fine root production both increase with total NPP, while stem production shows no overall trend. Total NPP tends to increase with soil phosphorus and leaf nitrogen status. However, allocation of NPP to below-ground shows no relationship to soil fertility, but appears to decrease with the increase of soil clay content.

Tipo de documento:Artículo - Article
Palabras clave:Bosques tropicales - Amazonia (Región); Ciclo global del carbono - Amazonia (Región); Productividad primaria neta - Amazonia (Región); Ciclos biogeoquímicos - Amazonia (Región)
Temática:5 Ciencias naturales y matemáticas / Science > 57 Ciencias de la vida; Biología / Life sciences; biology
Unidad administrativa:Sede Amazonía > Instituto Amazónico de Investigaciones (IMANI)
Código ID:3391
Enviado por : Biblioteca Sede Amazonia Universidad Nacional de Colombia
Enviado el día :22 Junio 2011 15:49
Ultima modificación:11 Oct 2012 16:35
Ultima modificación:11 Oct 2012 16:35
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