African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Effect of fire on flowering of Hyparrhenia hirta (L.) Stapf (C4), Merxmuellera disticha (Nees) Conert (C3) and Themeda triandra Forsskal (C4) on the Signal Hill, Cape Town, South Africa

M. H. Ligavha-Mbelengwa and R. B. Bhat*
Department of Botany, University of Venda, Thohoyandou, Limpopo 0950, South Africa.
Email: [email protected], [email protected]

  •  Accepted: 18 March 2013
  •  Published: 18 April 2013

Abstract

Flowering in Merxmuellera disticha was more strongly stimulated by fire in summer. Flowering tillers produced between 9 and 11 months after fire were significantly more abundant than those produced 21 to 24 months thereafter. Growth in terms of size of individuals was considered insignificant for analysis. NeighboredHyparrhenia hirta showed, to a certain degree, an out-of-season growth, production and reproduction, whilstM. disticha and Themeda triandra on the same plots did not. The xylem water potential of H. hirta[-10.9(±0.29)], M. disticha [-14.6(±0.80)] and T. triandra [-13.8(±0.29)] on one stand differed significantly from one another (p < 0.0001), and that of H. hirta [-19.7(±0.81] and M. disticha [-34.5(±1.26)] on the other stand also differed significantly from each other (p < 0.0001). One way analysis of variance (ANOVA) thereof produced the following (F-ratio = 13.893; degrees of freedom = 29, p < 0.0001), and for H. hirta versus M. disticha, (F-ratio = 97.605; degrees of freedom = 23, p < 0.0001). Multiple range analysis tests revealed a significant difference between xylem water potentials of Hhirta from that of M. disticha and T. triandra but not between M. disticha and T. triandra.

 

Key words: South Africa, Signal Hill, fire, flowering plants, impact.