Articles by Keyword: Prediction Models

Search results for Prediction Models

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  1. Towards the development of an environmental rule-based model for predicting recruitment in Brazilian sardine <em>Sardinella brasiliensis</em>

    Towards the development of an environmental rule-based model for predicting recruitment in Brazilian sardine <em>Sardinella brasiliensis</em>

    Item type: Journal Article • Journal: African Journal of Marine Science
    A rule-based model was built in order to analyse the effects of environmental variables (wind stress, Ekman transport, turbulence, and sea surface temperature [SST]) on the recruitment of the Brazilian sardine Sardinella brasiliensis. The purpose of modelling was (1) to...
  2. Stand basal area model for <em>Cunninghamia lanceolata</em> (Lamb.) Hook. plantations based on a multilevel nonlinear mixed-effect model across south-eastern China

    Stand basal area model for <em>Cunninghamia lanceolata</em> (Lamb.) Hook. plantations based on a multilevel nonlinear mixed-effect model across south-eastern China

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Based on a multilevel nonlinear mixed-effect model approach, a stand basal area model was developed for Cunninghamia lanceolata (Lamb.) Hook. plantations belonging to the National Forest Inventory in China. The database consists of 583 plots embracing 18 different blocks within...
  3. Bark thickness and bark volume of <em>Pinus patula</em> in South Africa

    Item type: Journal Article • Journal: Southern Hemisphere Forestry Journal
    In South Africa, tree volume tables and volume functions are usually based on the under bark stem volume. Many forest management studies, however, give the estimated over bark volume, in which case equations are required that estimate bark volume and...
  4. Optimising stocking rate under commercial and subsistence pastoralism <em>optimisering van veelading by kommersiele en bestaansveeboerdery</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Hopes for a single criterion of overstocking are forlorn. Livestock may be kept for any of many purposes, and the stocking rate optimal for one is not necessarily so for another. Conflicts might be resolved by (1) recognising the likely...
  5. The performance of tropical pastures in the drier phase of the Highland sourveld of Natal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Several tropical grasses (Acroceras macrum, Cenchrus ciliaris, Cyndon sp., Digitaria sp. and Pennisetum clandestinum) and legumes (Desmodium uncinatum and Lotononis bainesii) were evaluated at the Kokstad Research Station (Bioclimatic sub‐region 4f of Natal) over a period of seven years. The...
  6. Relations between woody and herbaceous components and the effects of bush‐clearing in southern African savannas

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The relations between woody and herbaceous plants in southern African savannas are reviewed in the context of pastoral use. Current knowledge is summarized, important gaps are indicated and research priorities are suggested. Although all savannas consist of a grass and...
  7. 'n Nuwe benadering tot die bepaling van hitte-eenhede vir sonneblom

    'n Nuwe benadering tot die bepaling van hitte-eenhede vir sonneblom

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die konvensionele metode vir die bepaling van hitte-eenhede is vergelyk met 'n nuwe benadering. Data uit sewe kultivarproewe insluitende daaglikse maksimum en minimum temperature is gebruik om die hitte-eenhedevereistes van drie kultivars te bepaal. Twee vergelykings is gebruik, een verteenwoordig...
  8. Assessment of recent drought severity for natural grassland at three locations

    Assessment of recent drought severity for natural grassland at three locations

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The relative severity of drought in natural grassland during three growing seasons was analyzed for three South African weather stations. Computer simulation of grassland water use, based upon weather records, was used to quantify drought and to compare the conditions...
  9. Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Preliminary evaluation of two maize (<em>Zea mays</em> L.) growth-simulation models

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two maize growth-simulation models developed in the U.S.A., CERES-Malze and CORNF, were evaluated with South African data using graphical and numerical techniques. The results indicate that both models agree well with observed values of total above-ground plant dry mass, leaf...
  10. Typifying late-season weather for maize yield prediction

    Typifying late-season weather for maize yield prediction

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Long-term weather data were used to generate typical weather records. By substituting typical weather data for actual late-season weather data it was possible to compute yield predictions using the model CERES-Maize, and compare these with predictions based on full season...