Spatial Distribution and Analysis of Artocarpus lanceifolius in the Bukit Timah Forest Fragment Teo X.Y.A. and Webb E.L
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چکیده
Bukit Timah Nature Reserve harbours the sole remaining primary forest patch in Singapore. Studies on the dynamics of the forest fragment are crucial. Large-scale spatial analysis of the nature reserve can reveal the factors and processes underlying an observed pattern, yet they have not been conducted. The current 2ha CTFS research plot was extended and all Artocarpus lanceifolius trees with a diameter at breast height above 4cm were mapped. The neighbourhood density function and Getis and Franklin’s L(d) statistical methods were then applied to analyse its distribution patterns. Both methods suggested an aggregated spatial pattern which decreased abruptly with distance. Maximum clustering of the trees occurred in two distant patches in the plot. Tree clumping was also more evident in juvenile trees than adult trees. Theoretically, A.lanceifolius, which is animal-dispersed, should display less aggregation than wind-dispersed tree species. Instead, this study proves the opposite, implying limitations in animal dispersal. In addition, the distribution of adult A.lanceifolius trees was confined only to the core regions of the reserve that correlate to primary forests. The secondary forests and margins of the reserve were totally void of adult A.lanceifolius trees.
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