Floresta estacional secundária: aspectos da dinâmica e manejo no bioma Cerrado
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2016-10-14
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Universidade Federal de Goiás
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This study had as objective to evaluate diametric growth aspects and the dynamics in a
Semideciduous seasonal forest, twelve years after the conduction of a silvicultural
management. The main objects were: to analyze the arboureous community density during
the period that ranges from 2003 to 2015, after silvicultural interventions (Chapter 1); to
develop Markov models and test its predictive capacity for different silvicultural managements
(Chapter 2). The experiment was carried out in 2003, in Fazenda Vagafogo, Pirenópolis,
Goiás. Experimental area was divided in four blocks, and, inside each one, three plots were
allocated (25 30 m – 750 m 2), with the following treatments: Treatment 1 – control (T1),
without interventions; Treatment 2 – all woody species were removed at a distance of one
meter, considering the wanted trees (T2); Treatment 3 – T2 was repeated, joining to large
lianas removal all over the plot (T3). Inside the plots, in 2003, 2007 and 2015, all the
individuals (DBH > 3 cm) were measured. The community dynamics, considering the period
ranging from 2003 to 2015, was described according to mortality taxes, recruitment, basal area
gain and loss, net change rate to the number of individuals and basal area. Collected data were
also used to develop Markov models that describe the seasonal forest dynamics of the diameter
distribution after silvicultural treatments application (GT1, GT2, and GT3). Treatments did not
negatively affect long term the community dynamics, because, in all treatments, recruitment
was higher than mortality. Growth taxes and annual periodic increment (API) between 2003-
2007 and 2007-2015 analysis allow us to conclude that silvicultural treatments lost its effect,
because taxes drop considerably in the second period compared to the first one. Models GT1,
GT2 and GT3 were tested for an 8 year period (two consecutive projections), and all of them
were able to efficiently simulate the diametric structure. This way, Markov chain is an efficient
tool to project seasonal deciduous forests dynamics upon silvicultural interventions, which
strengths its importance as a tool for forest management.
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Ferreira, G. F. Floresta estacional secundária: aspectos da dinâmica e manejo no bioma Cerrado. 2016. 116 f. Tese (Doutorado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2016.