Abstract
ABSTRACT: Production of Tectona grandis (teak) in integrated systems with livestock or agriculture demonstrates high potential of financial return. However, studies on the development of teak are still scarce, especially in the northern region state of Mato Grosso. In this study we sought to evaluate dendometric variables of a clonal population of teak in a forest-livestock integration system (LFIS), during a period of 53 months in the city of Alta Floresta, Mato Grosso, Brazil. For this purpose, three installments were samples, a total of 360 individuals, and for each the diameter was measured at 1.3 meters from the base so as to calculate the total volume, the current annual increment (CAI) and mean annual increment (MAI), and five adjusted regression models. The Hoerl model provided the highest adjusted coefficient of determination (R2aj), lowest standard error of estimate (Syx), coefficient of variation (CV %), and from this the growth curves were developed. Clonal stands of teakin the forest-livestock system presented increases in DBH, height and volume were superior in relation to other scientific studies with teak, indicating their viability in integrated systems with pastures in the region.
Highlights
In Mato Grosso cattle ranching has expanded greatly in recent decades (SILVA et al 2016)
The objective of the present study was to evaluate the development of the diameter at breast height (DBH), height and volume of a clonal stand of teak in LFIS, for 53 months, via different mathematical models and evaluated the mean annual increase (MAI) and current annual increase (CAI) of clonal seedlings in plantations integrated with pastures
The equation Ln (DBH) = 2.590 – 19.775 x (1/t) + 0.120 (Lnt), adjusted by the Hoerl model showed better precision and progressive increase in DBH (Figure 1B), presented the lowest standard error (14.49%) and demonstrated a higher value for the adjusted coefficient of determination (0.914), and the graphical distribution of the residues showed that the regression coefficients were significant and there was no bias (Figure 1A)
Summary
In Mato Grosso cattle ranching has expanded greatly in recent decades (SILVA et al 2016). It is noted that 100 million hectares of Brazilian pastures showed some degree of degradation (NIERI et al, 2018). The forest-livestock integration system (LFIS) stands out among the various types of systems, with inclusion of tree components providing animal comfort and improving soil fertility, resulting in greater productivity and profitability for rural producers due to the production timber products and animal protein in the same area (PAULA et al, 2013). Study of the silvicultural behavior of the species inserted in the LFIS is relevant, especially forest species with potentially high-value timber (NIERI et al, 2017). F. (teak) species from the tropical monsoon forests of Southeast Asia (MORETTI et al, 2014) shows potential for reforestation and the production of wood for sawmills (SILVA et al, 2016)
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