Resumo

KUBOTA, Victoria Rika; CABALLERO-GONZALEZ, Rubén Darío  e  FERNANDEZ-LOMAQUIZ, Aracery Elizabeth. Biomass variation over a 21 years period in an Upper Parana Atlantic Forest, Paraguay. Colomb. for. [online]. 2021, vol.24, n.1, pp.60-70.  Epub 03-Maio-2021. ISSN 0120-0739.  https://doi.org/10.14483/2256201x.16313.

The temporal variation of the tree biomass was analyzed in a remaining Upper Parana Atlantic Forest in Paraguay, focusing on forest dynamics and diameter classes. The total biomass of all individuals with DBH ≥ 10 cm was estimated in a permanent plot of 1 ha located in the Tati Yupi Nature Reserve of Itaipu Binacional, using measurement data from 1995, 2002, 2005, 2008, 2011 and 2016. In 21 years, the biomass increased by 0.82 Mg.ha-1.year-1; however the variation was not uniform between measurements. In the period 1995 - 2002 and 2002 - 2005, there was a reduction in total biomass of 4.28 and 0.81 Mg.ha-1.year-1, mainly due to high tree mortality. While in the period 2005 - 2008, 2008 - 2011 and 2011 - 2016, there was an increase in biomass of 6.00, 2.97 and 4.53 Mg.ha-1.year-1, respectively. The variation was more visible in lower diameter classes.

Palavras-chave : subtropical forest; diametric class; Forest dynamics; Itaipu Biosphere Reserve; Permanent plot; Tati Yupi Natural Reserve.

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