Incremento da biomassa aèrea da vegetação dos campos naturais do Paraná em período pós-queima

Abstract

The aim of this study was to determine the biomass increment of the natural grasslands vegetation in post-burn regeneration period in the area of Private Natural Heritage Reserve Caminho das Tropas, Palmeira County, Paraná State. The duration of the study was one year with six (bimonthly) data collections. Prior to firing, the biomass load was estimated in 14.90 ton.ha-1 and, after firing, the residual material charge (not burnt) estimated at 3.41 ton.ha-1. The biomass increase presented monthly average of 1.92 ton.ha-1 in the first six months, after which, occurred the stabilization. Loads of biomass determined for the different dates of collections were: 11.20 ton.ha-1 in the first, 13.05 ton.ha-1 in the second, 14.95 ton.ha-1 in the third, 14.88 ton.ha-1 in the fourth, 13.69 ton.ha-1 in the fifth and 14.29 ton.ha-1 in the sixth. The average moisture content of the material ranged from 243.98% recorded in the first collection to 56.18% in the last. The results showed that the recovery of the fields vegetation biomass in the study area occurred in a very short time and that the moisture content suffered precipitous drop in short time too.