OF FLORISTIC DIVERSITY OF FOUR WOODLAND TYPES IN THE UPPER HANTANA CAMPUS
R M C S Ratnayake*, I A U N Gunatilleke**
and C V S Gunatilleke** *
University of Kelaniya; ** University of Peradeniya
In the Upper Hantana campus land, three broad-leaf woodlands Peresereanthes
falcataria, Alstonia macrophylla, or mixed species woodland and Pinus
caribaea woodland grow in proximity to one another. The wide range of
floristic diversity exhibited by these different woodlands was compared
using plot sampling.
The overstorey vegetation of the Alstonia woodland showed the highest,
i) density, ii) floristic richness, iii) proportion of endemics and iv)
plant diversity, followed in decreasing order by that in the Peresereanthes-,
mixed-, and Pinus woodland. In the understorey vegetation, floristic diversity
(<10 cm) was highest in Peresereanthes woodland, followed in decreasing
order by that in Alstonia-, mixed species-, and Pinus woodlands. Species
rank abundance plots of overstorey and understorey species show that over
storey vegetation in Pinus woodland, fits the geometric series, whereas
the others fit the log series or log normal model.
The broad-leaf species woodlands in Upper Hantana also showed better natural
regeneration of an array of species. All woodlands showed differences
in micro-site conditions. Levels of human disturbance and burning may
contribute to differences amongst them. These results provide baseline
ecological information on natural regeneration in different woodland types
and indicate their relative potential for conservation of biodiversity
and water resources.
Department of Forestry and Environmental Science,
of Sri Jayewardenepura,Sri Lanka. 1999. All rights reserved.