Autor(es):
Amaral, Márcio Rogério Mota ; Lima, Adriano José Nogueira ; Higuchi, Francisco Gasparetto ; Santos, Joaquim dos ; Higuchi, Niro
Data: 2020
Origem: Oasisbr
Assunto(s): Dynamics; Logging (forestry); Population Statistics; Tropics; Forest Dynamics; Silvicultural Treatments; Tree Growth; Tree Mortality; Tree Recruitments; Tropical Forest; Forestry; Annual Variation; Experimental Study; Forest Dynamics; Growth Response; Logging (timber); Mortality; Recruitment (population Dynamics); Silviculture; Tropical Forest; Dbh; Dynamics; Forestry; Mortality; Recruitment; Selective Cutting; Trees; Tropics
Descrição
Long-term studies of the dynamics of managed forests in tropical regions are lacking. This study aimed to evaluate the dynamics of a tropical forest, over a 25-year period, that was experimentally logged in 1987 and 1988 and submitted to three different cutting intensities. All trees with diameter at breast height (DBH) ≥ 10 cm have been measured annually since 1990. The three logging intensities that were applied were: light (T1)-trees harvested with DBH ≥ 55 cm; medium (T2)-DBH ≥ 50 cm; and heavy (T3)-DBH ≥ 40 cm. Control plots (T0) were also monitored. The highest mean annual mortality rates (1.82% ± 0.38), recruitment rates (2.93% ± 0.77) and diameter increments (0.30 ± 0.02 cm) occurred in the T3 treatment. Shifts in dynamics of the forest were mainly caused by a striking increase in a fast-growing pioneer species and their high mortality rates. The loss in stocking caused by mortality was greater than to that of replacement by recruitment. The results demonstrated that selective logging altered the natural dynamics of the forest through increased: mortality rates, recruitment and growth rates of the residual trees. © 2019 by the authors.
