Articles by Author: Anthony R Palmer

Search results for Anthony R Palmer

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  1. Exploring ground-based methods for the validation of remotely sensed evapotranspiration

    Exploring ground-based methods for the validation of remotely sensed evapotranspiration

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Accurate estimates of evapotranspiration (ET) are essential when calculating catchment-scale water balances. An open top chamber (OTC), a ground-based method for measuring actual ET, was used to validate modeled ET from earth observation MODIS and agrometeorological data. We studied and...
  2. Modelling annual evapotranspiration in a semi-arid, African savanna: functional convergence theory, MODIS LAI and the Penman–Monteith equation

    Modelling annual evapotranspiration in a semi-arid, African savanna: functional convergence theory, MODIS LAI and the Penman–Monteith equation

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Accurately measuring evapotranspiration (ET) is essential if we are to derive reasonable estimates of production and water use for semi-arid savannas. Estimates of ET are also important in defining the health of an ecosystem and the quantity of water used...
  3. Feeding ecology of four livestock species under different management in a semi-arid pastoral system in South Africa

    Feeding ecology of four livestock species under different management in a semi-arid pastoral system in South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The Leliefontein communal area in Namaqualand is grazed by mixed species herds that have multiple benefits for pastoralists. This study assessed how the management (herding and free-ranging) of different livestock herds affects their feeding ecology during the wet and dry...
  4. Aboveground biomass production of a semi-arid southern African savanna: towards a new model

    Aboveground biomass production of a semi-arid southern African savanna: towards a new model

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Following a field campaign to determine the species composition, canopy cover, aboveground annual production and leaf area index (LAI) of the semi-arid savanna of north-western Namibia, we present a production model that can be used by graziers to determine the...
  5. Exploring the invasion of rangelands by <em>Acacia mearnsii</em> (black wattle): biophysical characteristics and management implications

    Exploring the invasion of rangelands by <em>Acacia mearnsii</em> (black wattle): biophysical characteristics and management implications

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Australian acacias have spread to many parts of the world. In South Africa, species such as A. mearnsii and dealbata are invasive. Consequently, more effort has focused on their clearing. In a context of increasing clearing costs, it is crucial...
  6. Determining fPAR and leaf area index of several land cover classes in the Pot River and Tsitsa River catchments of the Eastern Cape, South Africa

    Determining fPAR and leaf area index of several land cover classes in the Pot River and Tsitsa River catchments of the Eastern Cape, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Determining the quantum (both annual maxima and minima) and the temporal variation in the leaf area index (LAI), and the fraction of photosynthetically active radiation (fPAR), are three fundamental biophysical characteristics of the plant canopy that should parameterise ecophysiological models...
  7. Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation

    Estimating evapotranspiration in semi-arid rangelands: connecting reference to actual evapotranspiration and the role of soil evaporation

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    In a context of water scarcity, efforts to increase landscape production should focus on improving water productivity. This requires an appreciation of the various components of evapotranspiration (ET), including soil evaporation (Es) because the latter reflects ‘unproductive’ water loss. Both...
  8. Biodiversity in Southern Africa

    Biodiversity in Southern Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    2010, Klaus Hess Publishers, Sudetenland-Str. 18, 37085 Göttingen, Germany; and PO Box 90624, Windhoek, Namibia Hardcover, 3 volumes, XLIV + 1375 pp + CD-ROM