Efeito da exploração de impacto reduzido na dinâmica da densidade, dominância e crescimento de espécies de Sapotaceae em floresta de terra firme no município de Moju, estado do Pará.

Abstract

Effect of logging on structure and dynamics of some Sapotaceae species were evaluated in a dense tropical rain forest located in the municipality of Moju, Pará State, Brazil (02º 08º 14”? e 02º 12º 26” S e 48º 47º 34” e 48º 48º 14” W). Two hundred ha out of 1,050 ha forest area were selectively logged for timber (23 mº ha” logging intensity) in 1997.Twenty-two 0.5 ha permanent sample plots (11 ha sample) were established and all trees with dbh > 10 em were identified and measured for dbh in 1995, 1998 and 2010. Parameters evaluated were the following: Density (De), Dominance (Do), Canopy Value Index (CVD) diametric distribution, mortality, ingrowth and periodic annual increment (PAD). Sapotaceae shown a significant reduction of 7.7% on tree density (p=0.0147), and an increase in dominance of 1.4% which was similar to the dominance before harvest (p=0.7851). In the same period, decreases in density and dominance were observed to Pouteria laurifolia (Gomes) Radlk. (66.7% and 50.6%), Pouteria macrocarpa (Mart.) D. Dietr. (25% and 29.4%), Micropholis acutangula (Ducke) Eyma (20% and 11%), Manilkara huberi (Ducke) A. Chev. (16.4% and 17.7%) and Manilkara paraensis (Huber) Standl. (12.5% and 31.4%). These species also presented a negative balance regarding ingrowth and mortality: P. laurifolia (M= 7.2% year * and = 0.0% year ”), M. paraensis (M= 3.1 % year * and I= 2.3 % year *), P. macrocarpa (M=3.1% 1 year "| and 1.2% year ”), M. acutangula (M= 2.4% year ” and I= 0,9 % year ") e M. huberi (M= 0,9% year * and = 0,5% year ). Thirteen years after logging Sapotaceae presented reduction on density. The main commercial species M. Huberi did not recover its original density, but there was ingrowth of three new species of into the studied Sapotaceae population.