Abstract

The current trend towards more naturalness and increased protection of biodiversity at the level of forests stands requires the management of structurally diverse forests. In this study we investigated the consequences of single-tree harvesting in mixed-species eucalypt forests on stand structure and tree growth. Data from continuous inventory plots indicated that single-tree selection without additional tending over a period of 40 years leads to the accumulation of high basal areas. Although the diameter distribution indicated a balanced stand, a high proportion of the trees, particularly in small dimensions, was slow growing, and the current structure could not ensure the replacement of trees in sawlog dimensions within acceptable periods. We recommend that some investment is required to reduce basal area of non-merchantable trees in these forests to provide the necessary growing space, in particular for smaller trees.
These estimates must therefore be regarded as minimum turnover times for most species.