Sri Lankan forests: Diversity and genetic resources

Paris arrive 1e 14 septembre 1999, accepte 1e 2 novembre 1999Resume.-L'etude de Ia richesse floristique (nombre de taxons par unite de surface), de l'originalite (nombre de taxons endemiques par unite de surface) et de l'endemicite (frequence relative des taxons endemiques) permet de hierarchiser quelques territoires en fonction de l'abondance de leurs formes propres. Quelques-unes des causes possibles de divergences entre territoires sont brievement discutees. Abstract.-In order to ordinate some territories according to the abundance of their endemic taxa, their floristic richness (number of taxa per unit of area), originality (number of endemic taxa per unit of area). and endemicity (percent of endemic taxa) are studied. Some causes of the inequalities between the different territoiries are briefly discussed. Mots-c/es

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Floristic Composition and Medicinally Important Plants in the Understorey of the Tropical Dry Mixed Evergreen Forest at the Hurulu Reserve of Sri Lanka

Solangaarachchi¹,

Perera²

1993

J. Natn. Sci. Foundation Sri Lanka

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A study of the species composition and a quantitative sulvey of the understorey (diameter at breast height, DBH < 10 cm) at a selected site of the Hurulu forest reserve, a Tropical Dly Mixed Evergreen forest, were carried out. Eighty one species representing 73 genera and 37 families were recorded. About 6% of the species were found to be endemic and 61% were found to be of medicinal importance. The density and the percentage frequency of the species were presented in two categories separately. Plants of DBH < 10 cm and height > 1 m were included in category 1 whereas the plants of DBH < 10 cm and height < l m were included in category 2. Glycostnis anglrsnyofia. attained the highest density of 163 per 100 m2 and the highest percentage frequency of 71 in categoly 1. In categoly 2 the same species reached the highest density of 33 and the highest frequency of 20. Therefore it was concluded that Glycosmis angt(~nYo1ia. was the most ecologically important species in the understorey of the Tropical Dry Mixed Evergreen' forest.

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Sri Lankan forests: Diversity and genetic resources

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The biodiversity challenge: Expanded hot-spots analysis

The biodiversity challenge: Expanded hot-spots analysis

Réflexions sur la biodiversité: richesse, originalité et endémicité floris tiques

Floristic Composition and Medicinally Important Plants in the Understorey of the Tropical Dry Mixed Evergreen Forest at the Hurulu Reserve of Sri Lanka

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