Articles by Keyword: Indices Of Overlap

Search results for Indices Of Overlap

We found 42 results for you
  1. Calculating stocking rates for game ranches: Substitution ratios for use in the Mopani Veld

    Calculating stocking rates for game ranches: Substitution ratios for use in the Mopani Veld

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Determination of carrying capacity for mixed‐ or multi‐species grazing systems is complex. Commonly, each species is compared to the standard large stock unit (LSU) used in conventional agriculture. However, this approach does not allow for ecological separation, and thus overlooks...
  2. A mathematical model for assessing the influence of stocking rate on the incidence of droughts and for estimating the optimal stocking rates<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The Putu 11 simulation model was used to simulate veld production for each of 47 years, using weather input data and soil properties of a site at Glen. Grassland drought was defined as that condition encountered when 100 kg/ha or...
  3. A preliminary investigation of woody plant increase in the western Transvaal and implications for veld assessment

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The relationships between tree density and indices of pasture and soil condition were examined in Western Transvaal grasslands where Acacia karroo had increased following disturbance. The correlation between tree density and pasture condition was not linear, indicating a threshold in...
  4. A comparison of several nitrogen- availability indices on four Natal maize-producing soils

    A comparison of several nitrogen- availability indices on four Natal maize-producing soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Four methods used in obtaining nitrogen-availability indices were compared using soil and plant samples taken from maize trials conducted on four widely differing Natal soils. NO3 − N was determined after extraction of the soil with NH4HCO3, Ca(OH)2 and KCl,...
  5. The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons

    The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Existing colour indices were evaluated to determine their correlation with duration of water saturation, for a hydrosequence in the Grabouw district, Western Cape. Correlation coefficients ranged between 0.31 and 0.63. More simple colour indices were developed. Dry soil colour is...
  6. Exogenously applied ethylene reduces the cold requirement for ripening of pears (<em>Pyrus communis</em> L.) cv. Forelle

    Exogenously applied ethylene reduces the cold requirement for ripening of pears (<em>Pyrus communis</em> L.) cv. Forelle

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    ‘Forelle’ pears harvested at commercial maturity were treated with ethylene at 0, 10 or 100 μl 1−1 for 24 hours at 20°G before being stored at-0.5°Cfor 12 weeks. Periodic sampling of the fruit showed that both ethylene treatments significantly hastened...
  7. OBSERVATIONS ON TEMPORAL TRENDS IN PHYTOPLANKTON DIVERSITY IN THE VAAL RIVER AT BALKFONTEIN, SOUTH AFRICA

    OBSERVATIONS ON TEMPORAL TRENDS IN PHYTOPLANKTON DIVERSITY IN THE VAAL RIVER AT BALKFONTEIN, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Phytoplankton diversity in the Vaal River at Balkfontein from March to October 1984 was investigated by employing different diversity indices. Most diversity indices showed appreciable variation during the study period indicating specific temporal trends. Greatest diversity was demonstrated for warmer...
  8. Feeding characteristics of sheep (<em>Ovis aries</em>) and Grant's gazelles (<em>Gazella granti</em>) on Kapiti ranch, Kenya

    Feeding characteristics of sheep (<em>Ovis aries</em>) and Grant's gazelles (<em>Gazella granti</em>) on Kapiti ranch, Kenya

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    A study was conducted to determine the dietary characteristics of sheep and Grant's gazelles on Kapiti Ranch, Kenya. The botanical composition of the diet was determined using the faecal microhistological technique. Plant species in the diets were categorised into grass,...
  9. Assessing and monitoring rangeland condition in extensive pastoral regions using satellite remote sensing and GIS techniques: An application to the Ceres Karoo region of South Africa

    Assessing and monitoring rangeland condition in extensive pastoral regions using satellite remote sensing and GIS techniques: An application to the Ceres Karoo region of South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The purpose of this paper is to describe the use of satellite remote sensing and GIS techniques in applying a localised range condition assessment methodology based on fence‐line contrasts. The approach was to compute six dissimilarity indices for data on...
  10. Life form and species diversity on abandoned croplands, Roggeveld, South Africa

    Life form and species diversity on abandoned croplands, Roggeveld, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The Roggeveld consists of an island of Mountain Renosterveld (Fynbos biome) surrounded by Succulent Karoo biome vegetation. Since management of abandoned croplands depends on a better understanding of their succession sequences, vegetation recovery on abandoned croplands in the Roggeveld was...