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Influence of rainfall and grazing on the compositional change of the herbaceous layer of a sandveld savanna
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: T.G. O'Connor --- Resource Ecology Group, Department of Botany,The influence of heavy grazing by cattle for three years, and of rainfall interception for one year, on the herbaceous composition of a sandveld savanna in Gazankulu was investigated. The composition and the abundance of the predominant species changed substantially,... -
Vegetation patterns and nutrients in relation to grazing pressure and soils in the sandveld and hardveld communal grazing areas of Botswana
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Nsinamwa NM Moleele RJ SebegoA major challenge confronting managers of extensive grazing systems is uneven use of herbaceous forage plants by livestock. The concentration of grazing in preferred areas or around foci points (e.g. water points) eventually results in adverse impacts in soil nutrients,... -
Study on the early effects of several weed-control methods on Parthenium hysterophorus L.
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J Goodall --- , South Africa M Braack --- KZN Department of Agriculture and Environmental Affairs, South Africa J de Klerk --- , South Africa C Keen --- , South AfricaWe carried out a trial in the Hluhluwe-iMfolozi Park comparing three herbicides and two manual control techniques for controlling the annual weed Parthenium hysterophorus L. The herbicides 2,4-D amine (480 g ai l−1), metsulfuron methyl (600 g kg−1) and picloram... -
Rangeland degradation in semi-arid Swaziland: effects of dip-tanks on herbaceous vegetation and soil properties
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Solomon Tefera --- Department of Livestock and Pasture Science, South AfricaThis study investigated dip-tank use effects on herbaceous vegetation and soil, and relationships between environmental and species variables. Eight dip-tanks, three each in sandy (DPBS) and loamy (DYRL) soils, and two in stony (ROSG) soils were used. Data were collected... -
What are the long-term effects of high-density, short-duration stocking on the soils and vegetation of mesic grassland in South Africa?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Sindiso Chamane --- School of Life Sciences, South Africa Kevin P Kirkman --- School of Life Sciences, South Africa Craig Morris --- Agricultural Research Council–Animal Production Institute, South Africa Tim O’Connor --- South African Environmental Observation Network, South AfricaHigh-density, short-duration stocking (HDG) is gaining popularity amongst farmers in the South African mesic grasslands, but little is known about its potential impact on natural resources. Using a fence-line contrast approach, this study compared the long-term effects of HDG with... -
Response of three mesic South African perennial grassland forbs to defoliation and competition
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Sindiso Chamane --- Grassland Science, School of Life Sciences, South Africa Kevin P Kirkman --- Grassland Science, School of Life Sciences, South Africa Craig Morris --- Agricultural Research Council – Animal Production, c/o School of Life Sciences, South Africa Tim G O’Connor --- SAEON, South AfricaThe importance of maintaining biodiversity in natural grasslands under livestock production systems has been recognised. Forbs contribute more to species richness than grasses in South African grasslands. However, little is known about the impact of grazing and grass competition on... -
On the difference graph of power graphs of finite groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jitender Kumar --- Birla Institute of Technology and Science Pilani, India Ramesh Prasad Panda --- VIT-AP University, India Parveen --- Birla Institute of Technology and Science Pilani, IndiaThe power graph of a finite group G is the simple undirected graph with vertex set G whose two vertices are adjacent if one is a power of the other. The enhanced power graph of a finite group G is... -
Frequent defoliation rapidly and progressively reduces the vigour of a perennial mesic grassland forb, Thunbergia atriplicifolia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- University of KwaZulu-Natal, South Africa Sindiso Nkuna --- University of KwaZulu-Natal, South AfricaForbs in South African mesic grasslands are ancient, numerous, and diverse, thriving with fires and light herbivory but declining under chronic, severe grazing and trampling. This study tested the hypothesis that repeated herbivory progressively weakens forbs by reducing their underground... -
Does spring defoliation affect energy reserves in a South African mesic grassland geophyte?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- c/o School of Life Sciences, University of KwaZulu-Natal, South Africa Sindiso Nkuna --- School of Life Sciences, University of KwaZulu-Natal, South AfricaOvergrazing reduces the abundance of mesic grassland forbs, including geophytes. The potential negative effect of spring grazing, aimed at exploiting high-quality grass forage, on energy reserves in underground storage organs (USOs) of a mesic grassland geophyte, Merwilla plumbea (Lindl.) Speta,...