Articles by Keyword: Diversity Index

Search results for Diversity Index

We found 264 results for you
  1. Seasonal occurrence, distribution and diversity of phytoplankton in the Douala Estuary, Cameroon

    Seasonal occurrence, distribution and diversity of phytoplankton in the Douala Estuary, Cameroon

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The occurrence and abundance of phytoplankton in the Wouri and Dibamba rivers and the Douala Estuary and their relationships to physico-chemical conditions were studied during the wet and dry seasons of 2008. One-hundred-and-sixty-eight species belonging to 67 genera were identified...
  2. Preliminary evaluation of seed and germination traits in cowpea (<em>Vigna unguiculata</em>) genotypes

    Preliminary evaluation of seed and germination traits in cowpea (<em>Vigna unguiculata</em>) genotypes

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Cowpea is a valuable crop for subsistence farmers in South Africa. Seed quantitative traits and germination parameters are important for good establishment of the crop, therefore the variation for these traits were determined for 44 cowpea genotypes. A field experiment...
  3. Reductions in Plant Species Richness under Stands of Alien Trees and Shrubs in the Fynbos Biome

    Item type: Journal Article • Journal: South African Forestry Journal
    The reduction of species richness of indigenous plants is one of the major problems associated with the presence of dense stands of invasive alien trees and shrubs in the Fynbos Biome of the Cape Province, South Africa. A synthesis was...
  4. Impact of Wood Quality Assessments on Future Fibre Resources in the Pulp and Paper-making Industry

    Item type: Journal Article • Journal: South African Forestry Journal
    Recent evidence from research in Europe has indicated that individual trees can be sampled for their pulping properties by the removal of small quantities (5–50 g) of wood at about breast height (1,3 m above ground). Work began at Sappi's...
  5. Use of Ecological Site Classification in the Prediction of Forest Productivity and Response to Fertilisation

    Item type: Journal Article • Journal: South African Forestry Journal
    The principals of biogeoclimatic ecosystem classification were used to stratify sites supporting immature stands of coastal Douglas-fir. The resulting strata were shown to represent unique segments of regional gradients of available soil moisture and nutrients. Regression models indicated strong relationships...
  6. Seasonal Fluctuations and Diversity of Bark and Wood-boring Beetles in Lowland Forest: Implications for management Practices

    Item type: Journal Article • Journal: South African Forestry Journal
    The phenology and diversity of wood-living beetles attacking Cedrela mexicana, Khaya nyasica and Milicia excelsa were observed for one year with weekly window-flight-trap collections. A total of 150 species (10 known to be common pests of timber) were collected, most...
  7. 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...
  8. A comparison of five methods for assessing veld condition in the natal midlands

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Site rankings obtained from five methods of scoring veld condition in the highland sourveld and the moist tall grassveld of the Natal Midlands were correlated with rankings from methods of multivariate analysis. With few exceptions, all methods gave rankings which...
  9. The development of veld assessment in the northern Transvaal savanna I. Red Turfveld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Grazing‐induced gradients in pasture species composition were characterized for the red turfveld of the Northern Transvaal savanna. A proposed classification of pasture species response to grazing was developed and the influence of state variables and driving forces other than grazing...
  10. Vegetation response to wagon wheel camp layouts

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Wagon wheel camp layouts have been favoured, in some quarters, for rotational grazing due to the economy and convenience of having the camps radially arranged around central facilities. A possible disadvantage of such layouts is the tendency for over‐grazing near...