n Southern African Forestry Journal - Application of a 'stem number guide curve' for sustainable harvest control in the dry woodland savanna of northern Namibia : research note
|Article Title||Application of a 'stem number guide curve' for sustainable harvest control in the dry woodland savanna of northern Namibia : research note|
|© Publisher:||South African Institute of Forestry (SAIF)|
|Journal||Southern African Forestry Journal|
|Author||F.P. Graz and K. Von Gadow|
|Publication Date||Jul 2005|
|Pages||37 - 44|
|Keyword(s)||Guide curve, Negative exponential function, Savanna woodlands and Stem number|
The savanna woodlands of north-eastern Namibia are a significant source of essential resources for the rural population. Thus far, however, there is little or no growth data available to predict future timber supplies and current yield regulation is limited to the issuing of harvesting permits based on the assessment of available tree sizes, rather than a tree population as a whole. This paper presents the negative exponential function for the development of a guide curve. The curve defines an optimum stand structure based on desired timber yields for specific tree sizes, the intrinsic mortality rates of individual species and the total desirable stocking of a stand. The application of the approach is assessed using the size class distributions of two prominent tree species of the Kanovlei area in north-eastern Namibia. While the function models the development of the populations of the species well, timber and non-timber trees will need to be modelled separately. In the coming years it will be an important priority to establish a system of sample plots to obtain growth data that may support or augment the system.
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