A Method for Determination of Volumes of Previous Thinnings and Site Productivity Using Tree Stumps

Abstract

A trial was conducted to determine indirectly volumes of previous thinnings using data from four sample plots measured in Lembwa forest, south of Singa, Sudan. In each sample, plot diameters of all standing trees were measured at breast height and at ground level. In addition, diameters at ground levels of all stumps were measured. The regression analysis showed a strong relationship between diameter at ground level and at breast height of a tree. For determination of height and form factor of previously thinned trees, results of a research carried out by the author in 1985 were used. The results of this study emphasize that it is possible to determine volumes of previous thinning as well as the actual potentials of the tree species, Acacia nilotica, by using stump measurements only.