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Relationships between herb layer and canopy composition in a tropical rain forest successional mosaic in Singapore

Published online by Cambridge University Press:  10 July 2009

I. M. Turner ,
H. T. W. Tan  and
K. S. Chua
I. M. Turner
Affiliation:
School of Biological Sciences, National University of Singapore, Singapore119260
H. T. W. Tan
Affiliation:
School of Biological Sciences, National University of Singapore, Singapore119260
K. S. Chua
Affiliation:
School of Biological Sciences, National University of Singapore, Singapore119260
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Abstract

Clusters of four circular forest plots, 0.2 ha in total area, were inventoried for canopy tree (≥30 cm gbh) and terrestrial herb floristic composition at 46 sites in the Central Catchment Nature Reserve, Singapore. The Nature Reserve covers a complex mosaic of lowland tropical forest of different successional stages, with much of the area covered in secondary forest 50–100 years old developed on exhausted agricultural soils. A total of 449 species of tree and 59 species of terrestrial herb were recorded from the clusters. Facultatively-terrestrial epiphytes were excluded from the analysis. Possible reasons for the low herb diversity are discussed. There was a marked similarity between ordinations (detrended correspondence analysis) of the clusters based on tree canopy composition weighted by species relative contribution to cluster total basal area and the herb flora composition, with a highly significant correlation between first axis scores of the two ordinations. Both ordinations showed the three clusters from freshwater swamp forest to be highly distinctive from the rest. The two forest strata exhibited a parallel response to the successional gradient, though the low diversity and patchy distribution of the herb flora blurred the distinction between primary and secondary communities more clearly seen in canopy composition.

Keywords

detrended correspondence analysisherb floratropical rain foresttropical secondary forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 12 , Issue 6 , November 1996 , pp. 843 - 851
Copyright
Copyright © Cambridge University Press 1996

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