Estratégias para o manejo de Carapa guianensis Aublet na Floresta Nacional do Tapajós
Fecha
2024-03-26Autor
http://lattes.cnpq.br/0879648522574450
https://orcid.org/0000-0002-3568-4401
XIMENES, Lucas Cunha
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The objectives of this thesis were to analyze the population structure and spatial pattern
of Carapa guianensis Aublet trees and to define its Minimum Logging Diameter (MLD)
and Cutting Cycle (CC) in the Tapajós National Forest, to prospect timber management
strategies for that species. The data to answer the first objective comes from the 100%
(pre-exploratory) inventory of Annual Production Units (APUs) 4, 9, 10, 11, 12, 13 and
1, with inclusion level of diameter at breast height – DBH ≥ 20 cm. The horizontal
structure, diameter distribution, the spatial distribution pattern using Ripley's K method
and the Kernel density for the total population and by diameter class were calculated,
taking into account the geographic coordinates of the trees. The spatial distribution pattern
was predominantly aggregated, being essential for the planning and execution of timber
and non-timber harvesting activities for possible future management of the species.
Kernel density maps proved to be an effective tool in the capacity to provide subsidies
for the manager to plan both the timber exploitation ofCarapa guianensis and non-timber
exploitation. To respond to the second objective, 30 trees were selected, located in APUs
4 and 10 in the Tapajós National Forest. Using a probe, 2 to 3 wood cores per tree were
collected at a height of 1.3 m above the ground, totaling 85 cores. To model growth, the
Growth-Oriented Logging (GOL) method was applied, with the construction of curves of
diameter, basal area, and volume as a function of age. The value of the current annual
increment (CAI) and the mean annual increment (MAI) of the DBH of the trees without
the bark were obtained from the cumulative growth in the different years. The MLD
corresponded to the diameter at the age at which the species reached its highest current
increase in volume. The cutting cycle was determined by estimating the average passage
time through the 10 cm diameter classes, until reaching the calculated specific MLD. The
species Carapa guianensis has distinct annual growth rings, that allow modeling the
growth patterns in diameter, volume and basal area, allowing specific management
criteria to be established. The results indicate that in order to have sustainable
management, the MLD must be 50 cm, with a 14,8-year cutting cycle.