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  FORESTRY SYMPOSIUM 1996
NATURAL REGENERATION OF WOODY PERENNIAL SPECIES UNDER Pinus caribaea PLANTATION IN YAGIRALA FOREST RESERVE

Sujatha Ponnamperuma and S G Banyard
University of Sri Jayewardnepura

The undisturbed natural regeneration of woody perennial species under 22 year old unthinned Pinus caribaea plantation in Yagirala Forest Reserve in Lowland Evergreen Forest in the Wet Zone of Sri Lanka was observed on a 1.8 hectare permanent sample block. The original natural forest had been selectively logged causing considerable change in the floristic composition of the forest surrounding the plantation. Each individual woody perennial ( having a dbh >= 1 cm ) on the block was measured for dbh and entered into a database. The relative position of each individual was also recorded on a location map which also included all pine trees. 1206 stems of pine were found on the 1.8 ha block (670 stems per ha; 19.72 m2 basal area per ha).

In all, 51 species belonging to 42 genera and 24 families were found giving a total of 1252 individual woody perennials (696 stems per ha and 5.07 m2 basal area per ha, excluding pine). Species composition and Importance Value Indices were determined. It was shown that there was very little correlation between the frequencies and basal areas of pine and other species.

It is suggested that, although the natural regeneration of woody perennials is relatively slow, this forest should not be seen as a " biological desert " , a term commonly applied to pine plantations in Sri Lanka.

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Department of Forestry and Environmental Science,
University of Sri Jayewardenepura,Sri Lanka. 1999. All rights reserved.