Articles | Volume 6, issue 12
Biogeosciences, 6, 2759–2778, 2009

Special issue: Biogeochemistry and function of Amazon Forest

Biogeosciences, 6, 2759–2778, 2009

  01 Dec 2009

01 Dec 2009

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

L. E. O. C. Aragão1,2, Y. Malhi1, D. B. Metcalfe1,2, J. E. Silva-Espejo3, E. Jiménez4, D. Navarrete4,5, S. Almeida6, A. C. L. Costa7, N. Salinas1,3, O. L. Phillips9, L. O. Anderson1, E. Alvarez4, T. R. Baker9, P. H. Goncalvez7,8, J. Huamán-Ovalle3, M. Mamani-Solórzano3, P. Meir12, A. Monteagudo13, S. Patiño4, M. C. Peñuela4, A. Prieto14, C. A. Quesada9,10,11, A. Rozas-Dávila3, A. Rudas15, J. A. Silva Jr.7, and R. Vásquez13 L. E. O. C. Aragão et al.
  • 1Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, OX1 3QY, Oxford, UK
  • 2Climate Change and Sustainability Group, School of Geography, University of Exeter, Amory Building, Rennes Drive, Exeter, Devon, EX4 4RJ, UK
  • 3Universiadad Nacional San Antonio Abad, Cusco, Peru
  • 4Grupo de Estudio de Ecosistemas Terrestres Tropicales, Universidad Nacional de Colombia, Leticia, Colombia
  • 5Fundación Puerto Rastrojo, Bogotá, Colombia
  • 6Museu Paraense Emilio Goeldi, 66077-530 Belem, Brazil
  • 7Universidade Federal do Para, Belem, Para, Brazil
  • 8Universidade Federal de Vicosa, Vicosa, Minas Gerais, Brazil
  • 9Earth and Biosphere Institute, School of Geography, University of Leeds, LS2 9JT, UK
  • 10Institito National de Pesquisas Amazônicas, Manaus, Brazil
  • 11Departamento de Ecologia, Universidade de Brasília, Brazil
  • 12School of Geography, University of Edinburgh, Edinburgh, UK
  • 13Jardin Botanico de Missouri, Oxapampa, Pasco, Peru
  • 14Instituto Alexander von Humboldt, Claustro de San Agustín, Villa de Lleva, Boyaca, Colombia
  • 15Universidad Nacional de Colombia, Instituto de Ciencias Naturales, Apartado 7495, Bogota, Colombia

Abstract. 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±1.3 Mg C ha−1 yr−1 (mean±standard error), at a white sand plot, and 17.0±1.4 Mg C ha−1 yr−1 at a very fertile Terra Preta site, with an overall average of 12.8±0.9 Mg C ha−1 yr−1. The studied forests allocate on average 64±3% and 36±3% of the total NPP to the above- and 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.

Final-revised paper