Title: Initial spacing, stand density and thinning in eucalypt plantations
Abstract: Research into the closely related subjects of initial spacing, stand density and thinning in eucalypt plantations is reviewed. To provide a better understanding of these subjects and to assist in management decisions, a brief introduction into the growth habits of eucalypts and into the dynamics of man-made stands of this genus are given. The effects of spacing and stocking on stand characteristics and parameters such as mortality, height, diameter, basal area, volume, culmination of increment, tree form and wood quality are given. Spacing practices for eucalypts in various countries are described and general recommendations are made. It is concluded that spacing and stand density are primarily dependent on site quality and the object of management. In general, tree rows should not be wider than 3 m, and spacings within the rows should be closer on better sites and when optimization of total volume is the main objective. On poorer sites and when highly valued products are the objectives, the intra-row spacing should be not more than 2.5 m. The latest results of a 20-year-old factorial thinning experiment with Eucalyptus grandis (Hill) Maiden are discussed briefly. The influence of intensity, commencement and frequency of thinning, and final stocking on stand diameter, height, basal area, standing volume and mean ansual increment are indicated. In addition, thinning practices are discussed and various thinning regimes for different species, countries and management objectives are given. It is concluded that thinnings should start early and be carried out at frequent intervals, and that the first one should be heavier than the later ones.
Publication Year: 1989
Publication Date: 1989-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 78
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