Produção do pinus taeda l. Em povoamento desbastado na região dos campos de cima da Serra, rio grande do sul

Abstract

This work was carried out with the objective of studying the yield of Pinus taeda L., planted in an initial spacing of 3 × 2 m, located in Canela, Rio Grande do Sul state. The amostral population was submitted to one and two selective thinning, beyond a control sample, without thinning. The selective low thinning was conducted with reduction of the basal area to levels of 28 m2/ha. At age 17, the total yield of the control sample, without thinning, was 886.3 m3ha-1; with one thinning at age 11 the yield was 756.6 m3ha-1, resulting in losses of yield of 14.6% compared to the control; with two selective at ages 11 and 15, the yield was 732.9 m3ha-1, resulting in losses of yield in relation with the control sample, without thinning, of 17.3%. The selective thinning allowed a significant gain in diameter, up to age 17; with the execution of a selective thinning at age 11 an average diameter of 33.4 cm; was obtained with two selective thinning at ages 11 and 15 an average diameter of 33.5 cm; and an average diameter of 24.3 cm in the control sample, without thinning.