Abstract

QUINTO MOSQUERA, Harley  and  MORENO HURTADO, Flavio. DYNAMICS OF TREE ABOVEGROUND BIOMASS IN A TROPICAL RAIN FOREST OF THE CHOCÓ BIOGEOGRÁFICO. Rev. Fac. Nac. Agron. Medellín [online]. 2011, vol.64, n.1, pp.5917-5936. ISSN 0304-2847.

The study of the aboveground biomass (AB) of tropical forests is fundamental to understand the balance of the global C in the context of the climatic change. We quantified the AB in a mature forest of Salero (Chocó Biogeográfico), by means of equations designed for tropical humid forests, starting from data of wooden density, diameter (D) and height of trees (with D = 10 cm) measured in two permanent sub-parcels (E and U) of 1 hectare (ha), which were measured in the years 1998, 2005 and 2008. Inthis years the AB was of 237.31 t·ha-1, 259.99 t·ha-1 and 217.97 t·ha-1 respectively in the E sub-parcel. While in the U it was of 178.94 t·ha-1 and 179.17 t·ha-1 in the years 2005 and 2008; the differences of the aboveground biomass through the time were not significant. The increments annual averages in survivors' BA were of 4.42 and 3.18 t·ha-1 year-1 in the E and U sub-parcels respectively. Also, in sub-parcel E under conditions imperturbadas, the rate of net increment was presented in the AB (TINBA) of 2.61 t·ha-1 year-1, in agreement with the hypothesis of the increment in the BA in the tropical humid forests. The PPNA of carbon in Salero was of 5.21 t·ha-1 year-1, therefore the results didn't support the hypothesis of the decrease in the productivity of the tropical forests with the increment in the precipitation.

Keywords : Change climatic global; carbon; net increment of the aboveground biomass; net primary productivity; permanent plot..

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