Pine plantations are an important wood source in Brazil, with Pinus taeda being most frequently planted. Most pinewood is directed to the paper and pulp industry, but there is an increasing demand for wood for solid end-uses, requiring large stems from longer rotations which can be obtained using P. taeda as the canopy in two-aged stands. We evaluated radial growth and wood density at different stem heights of P. taeda in the highlands of Southern Brazil over a production period of 36 years and subjected to shelterwood harvest. Cross-sectional disks were obtained from 15 trees in different stem heights; 10 were used for growth analyses and 5 for growth and density analyses. We used disk images and X-ray techniques for growth and density analyses, respectively. Samples were analyzed for ring (width and density), earlywood, and latewood (width, density, and proportion). Ring width varied between 0.4 and 1.7 cm, with the widest rings in the first years (3–5 years.) of growth. Ring density increased with age, with higher densities on the lower stem portions. Mature wood started to be formed from the 16th ring onwards. Shelterwood harvest affected both ring width and density, but the effects on ring width lasted for at least 5 years, while the effects on wood density were short-lasting. Mature P. taeda trees increased their size after the shelterwood harvest without compromising their wood density. Longer production periods of P. taeda as retained trees in the canopy of two-aged stands provide high-quality wood for structural purposes.

松树人工林是巴西重要的木材产地，松树田地的种植最为频繁。大多数松木直接用于造纸和纸浆工业，但是对于用于固体最终用途的木材的需求在不断增长，需要更长的旋转来支撑大茎，这可以通过使用taeda taeda作为两龄林中的树冠来获得。我们在不同的干高度评价径向生长和木材密度火炬松在巴西南部的高地生产了36年，并砍伐了防护林。从15棵不同茎高的树上获得了横截面圆盘。10个用于生长分析，5个用于生长和密度分析。我们分别使用磁盘图像和X射线技术进行生长和密度分析。分析样品的环（宽度和密度），早木和晚木（宽度，密度和比例）。环的宽度在0.4到1.7厘米之间变化，在生长的头几年（3-5年）中环的宽度最大。环的密度随着年龄的增长而增加，下部茎部的密度更高。从第16圈起开始形成成熟的木材。阔叶林的采伐影响环的宽度和密度，但对环的宽度的影响至少持续了5年，而对木材密度的影响是持久的。成熟taeda树木在砍伐砍伐木材后增加了大小，却没有损害木材的密度。taeda的生产周期较长，因为在两龄林冠层中保留的树木为结构目的提供了高质量的木材。