Resumo

PENA, Miguel A.; SALDARRIAGA, Juan  e  DUQUE-MONTOYA, Álvaro J.. CARBON ACCUMULATION AND STRUCTURAL CHANGES IN SECONDARY FORESTS IN EASTERN ANTIOQUIA, COLOMBIA. Actu Biol [online]. 2011, vol.33, n.95, pp.209-217. ISSN 0304-3584.

We studied secondary forest succession of areas in eastern Antioquia, Colombia that were previously used for cattle ranching by analyzing tree density, basal area and aboveground biomass. Six forest patches in two age categories were investigated: Secondary forest (BS) that was 15 to 20 years old, and BS that was 25 to 30 years old. BS recovery was compared to secondary information from mature forest (BM). The BS and BM presented significant differences between the mean above ground biomass and basal area, but not in tree density as a function of years since abandonment. 25 to 30 year old secondary forests had recovered an estimated 85.2% of basal area and 52.7% of aboveground biomass with respect to those of BM. Over the entire area studied, mean annual accumulation of aboveground biomass in the forest patches in 2005 was 4.6 ± 0.3 t ha^-1 per year, which represented a total of 323,469.8 ± 23,227.3 t, equivalent to 161,734.88 ± 11,613.65 t of carbon storage (C). These results confirm that management of natural regeneration is a viable, low cost strategy for the recovery of forest structure in this study area. Also, they demonstrate the high net primary productivity of this successional forest ecosystem and its contribution to the global carbon cycle.

Palavras-chave : aboveground biomass; basal area; natural regeneration; succession; tree density; tropical forest.

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