Estimativa de crescimento de Pinus taeda L. em Inhamacari usando a técnica de análise de tronco

Abstract

This work was carried out in Inhamacari forest (Administrative Post of Machipanda) in Manica province from January to February 2010 with the aim of estimating the growth of Pinus taeda L. using the trunk analysis technique. To achieve the proposed objectives, four trees from the dominant stratum with a straight shaft, free from pests and diseases and which had not undergone any silvicultural intervention (pruning), were randomly selected for felling. After felling, the sample trees were sectioned at different heights to make slices/disks that allowed for information on growth rates in diameter, height, volume and form factor as a function of age. In the estimation of growth through ANATRO, a sigmoidal growth pattern "S" was registered for the dendrometric variables diameter and height; the volume manifested unlimited "J" shaped growth. In the development of growth and increment tables, it was found that at 28 years of age, the variables DBH, height and volume obtained an MAI of 0.89cm-arv~ -year", 0.55m-arv~year' and 0.0148m - arv~ year' respectively. As for the maximum growth (MAmax) it was verified that the diameter reached a value of 0.96cm-arv~1 -year"1 and the height 0.62m-arv~1 -year"', at 21 and 19.5 years respectively. The maximum annual growth in volume was not reached because the intersection of the IMA and ICA curves did not occur. With regard to the form factor, this showed an irregular behavior over time, having presented a maximum value of 0.890 and a minimum of 0.208 at 2 years and 25 years respectively. From the data resulting from ANATRO, a growth and production table was built that allows visualizing the behavior of diameter, height, cross-sectional area (G), volume and its increments (IMA and ICA) and the form factor as a function of age. forest in order to calculate the following parameters of the Pinus taeda L. stand: density No,arv-ha~1 «1372arv -ha~’; production in terms of G-haA 36.63 m2-ha[ and Vol-ha_1 568.61 m3-ha1; and average productivity in terms of G-ha~1 •anu 1 «1.31 m2 -ha"1 -year"1 e V -ha 1 • year 1 « 20.31 m3 - ha 1 • year 1 r. (TRADUÇÃO NOSSA)