Tree-ring growth response of teak (Tectona grandis L.f.) to climatic variables in central-west region of Brazil

Through a non-destructive method, four core wood samples were taken at DBH of fifteen trees from an unmanaged teak (Tectona grandis L.f.) stand in Caceres, Mato Grosso, Brazil. Wood core samples were prepared for anatomical analysis, digitized and growth ring widths were measured using image analysis software. Growth rings were large and well defined in the juvenile phase, reflecting the fast-growing character of the species. Three types of false growth rings were identified. Types I and II occurred in the earlywood and type IV in the latewood zone. The occurrence of false growth rings was higher in juvenile wood than in mature wood. The relationship between growth ring width of teak trees and climate was explored using data of monthly temperature and rainfall. It was found that high temperatures during the rainy season had a significant negative effect on tree growth. On the other hand, a rainfall event during the dry months could affect the growth positively. The correlations found between growth rings and climate factors help understand and predict the local climate influence on teak tree growth for this area in Brazil.