Browsing by Author "Graz, F. P."

Now showing 1 - 5 of 5
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    Application of a total station in savanna vegetation surveys.
    (Namibian Scientific Society., 2004) Graz, F. P.
    The article describes the methods used to obtain data with the use of a total station. The advantage of the proposed method is the ease with which data for investigation of spatial relationships between plants and topographical features may be obtained. In addition to location, the total station can be used to assess some plant parameters such as plant height, crown spread, trunk size and others.
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    Description and ecology of pterocarpus angolensis in Namibia.
    (Namibian Scientific Society., 2004) Graz, F. P.
    The tree Pterocarpus angolensis is an important component of the dry woodland savanna of northern Namibia. Its timber provides the basic resource for much of the carvings in Namibia. Unfortunately little management, particularly regeneration, has been implemented in the country and current exploitation practices amount to mining of the species.
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    Description and ecology of Schinziophyton rautanenii (Schinz) Radcl.-Sm. in Namibia.
    (Namibian Scientific Society., 2002) Graz, F. P.
    The Manketti, Mangongo or Mangetti, Schinziophyton rautanenii (Schinz) Radcl.-Sm is an indigenous tree in Namibia, the fruit of which are of significant socio-economic value. The tree occurs in what appears to be even aged groves on deep sand, as part of the dry savanna woodlands. Natural regeneration in the woodland areas seems to be scarce, although some success has been achieved by planting truncheons.
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    Fire damage to Schinziophyton rautanenii (Schinz) trees in north-eastern Namibia.
    (Namibian Scientific Society., 2003) Graz, F. P.
    The nuts of the Mangetti, Schinziophyton rautanenii, are an important food source for a number of rural communities. The environment in which the tree grows, however, is subject to frequent burning. A number of trees have been seen with a characteristic inverted U-shaped fire lesion on the base of the trunk. A collapsed trunk as well as a vertical scar in the same tree showed that heavy branches or a second trunk may collapse under their own weight, thus providing a point for fire entry.
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    Spatial diversity of dry savanna woodlands: Assessing the spatial diversity of a dry savanna woodland stand in northern Namibia using neighbourhood-based measures.
    (Kluwer Academic Publishers, 2004) Graz, F. P.
    The dry woodland savannas of Namibia are of significant socio-economic importance. The paper tests the suitability of a number of diversity indicators developed for species poor systems in Europe in the woodland context. The indicators that were tested included the species significant mingling index, MSp, the measure of surround and the uniform angle index. The simple application of the methods permit relatively unschooled crews to conduct an enumeration in the field. The results show that the indicators do not only display current diversity status, but also reflect the ecological context of the individual species.