Abstract
Dynamics studies associated with prognosis can support planning actions for the conservation and sustainable use of forest resources. Therefore, the objective of this study was to evaluate the dynamics and predict the diameter structure using the Markov chain model for an area of caatinga forest submitted to different management practices. The study was carried out in the Contendas do Sincorá National Forest in the state of Bahia. Four treatments were installed, corresponding to three management systems and one control. Data was obtained measuring all individuals with a diameter greater than or equal to 5 cm. The measurements were performed at two moments in 2015 and 2018. The results indicated that the selective cut-by-diameter treatment had the lowest mortality rate and the highest recruitment rate. Predictions of the diameter structure using the Markov chain do not generally present statistical differences (α0.01) between the observed and expected frequencies for the year 2018. It was concluded that the basal area showed a tendency for recovery and growth in the treatments which involved suppression compared to the control, with no statistically significant differences among treatments until the moment after intervention.
Highlights
The Caatinga biome occupies an area equivalent to 11% of the Brazilian territory and encompassing most of the Northeast states and the North of Minas Gerais (Guerra et al, 2014; IBGE, 2019)
The present study aimed to evaluate the forest dynamics and predict the diameter structure in a Caatinga area submitted to different forest management practices
After the three years of intervention it was found that there was no significant difference among treatments for the basal area by analysis of variance at 95% probability (Table 2)
Summary
The Caatinga biome occupies an area equivalent to 11% of the Brazilian territory and encompassing most of the Northeast states and the North of Minas Gerais (Guerra et al, 2014; IBGE, 2019). This biome is considered a unique ecosystem, presenting a significant number of rare and endemic taxa (Ferraz et al, 2013; Pereira Junior et al, 2014). Garlet et al (2018) highlighted that one of the main exploitive actions of Caatinga vegetation is removing firewood. Despite some studies already having been conducted, little is known about understanding the Caatinga, especially how to use the available forest resources offered by this biome in order to maintain its regeneration cycle and be exploited once again (Vasconcelos et al, 2017). Garlet et al (2018) highlighted that one of the main exploitive actions of Caatinga vegetation is removing firewood. Campello (2019) revealed that firewood has a 33% share in the energy matrix of the Northeast region, often it being removed through unsustainable exploitation
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