GROWTH RATE OF SEEDLINGS OF Parkia gigantocarpa Ducke IN GAP ENRICHMENT SYSTEM AFTER HARVESTING

Abstract

Avaliou-se o incremento peri\uf3dico anual (IPA) em altura, considerando quatro per\uedodos (2005 a 2006, 2006 a 2008, 2008 a 2010 e 2005 a 2010) ao longo de cinco anos, de mudas de Parkia gigantocarpa Ducke plantadas em clareiras, causadas pela explora\ue7\ue3o florestal, no Munic\uedpio de Paragominas, estado do Par\ue1 (3\ub030\u2019S e 48\ub045\u2019W). Foram considerados tr\ueas tamanhos de clareiras: I- clareira pequena (200 a 400 m\ub2), II- clareira m\ue9dia (401 a 600 m\ub2) e III- clareira grande (> 600 m\ub2). No per\uedodo de 2005 a 2010, considerando todos os tamanhos de clareiras, Parkia gigantocarpa apresentou um incremento peri\uf3dico em altura, de 96,7 cm ano-1. Nas clareiras grandes, no per\uedodo de 2008 a 2010, o incremento foi de 137,9 cm ano-1 diferenciando em 5% de probabilidade das clareiras pequenas, onde o incremento foi de 64,2 cm ano-1. Tamb\ue9m nas clareiras grandes, nesse mesmo per\uedodo, n\ue3o houve mortalidade de mudas, enquanto que nas clareiras pequenas e m\ue9dias a mortalidade foi de 16,1% e 9,7% ano-1, respectivamente. Os resultados indicam que a esp\ue9cie pode ser utilizada em plantios de enriquecimento em clareiras causadas pela explora\ue7\ue3o florestal.Height periodic annual increment (2005-2010) of seedlings of Parkia gigantocarpa Ducke planted in gaps caused by logging, in the municipality of Paragominas, state of Par\ue1 (3\ub0 30\u2019S; 48\ub0 45\u2019W) was evaluated. Three gap sizes were considered: small gap (200-400 m2); medium gap (401-600 m2); and large gap (> 600 m2). Parkia gigantocarpa had high height increment in all gap sizes during the study period, with 96.7 cm year-1 from 2005 to 2010. From 2008 to 2010 the increment in large gaps (137.9 cm year-1) was significantly different at p < 0.05 from small gaps (64.2 cm year-1). There was no mortality in large gaps in that period but in small and medium gaps the mortality rate was 16.1% and 9.7%, respectively. According to these results we can suggest the species for enrichment planting after logging, mainly in gaps larger than 600 m2