Abstract
The present research studies the effects on the diversity of pteridophytes after the conversion of natural forests to agricultural plantations. A study using the quadrat method was carried out to compare the similarities and differences in species richness and composition of pteridophytes in the natural and manmade forests in Johor State of Peninsular Malaysia and Singapore. Six non-contiguous quadrats measuring 10 m × 10 m were established in each of the five selected study sites consisting of natural forest, oil palm plantation and rubber plantation in both Johor and Singapore. Comparison was done using the Sorenson’s index of similarity, Detrended Correspondence Analysis (DCA), and the two-way indicator species analysis (TWINSPAN). The studies showed that the number of pteridophyte species captured by the 6 quadrats in the natural lowland forest seems comparable to that of the man-made forest. However, the species composition is different in the different types of forests. The pteridophytes maintain their diversity along a gradient from forest to agricultural landscapes by the replacement of shade-demanding and niche-specific species, to broad niche, opportunistic and sun-loving species.
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