PJB-2024-175
STAND STRUCTURE AND SPECIES COMPOSITION OF FRAGMENTED FORESTS IN SARAWAK
Afifi Nazeri
Abstract
Forest fragmentation is a major threat that challenges biodiversity conservation. The objective of this study was to determine stand structure, tree diversity, and tree distribution in two fragmented forests designated as areas of high conservation value within an oil palm plantation in Sarawak. The line transect sampling method was employed, where 25 quadrats in each study site were established, enumerating trees with a diameter at breast height of 10 cm and above. The stand structure, importance value index and alpha diversity were estimated. Morisita's dispersion index was determined to assess the relative dispersal pattern, and Jaccard's similarity coefficient was used to evaluate the species' compositional similarity between the two fragmented forests. Generally, the stand characteristics between the two fragmented forests did not differ. Tree diameters display a consistent reverse J-pattern, indicating natural regeneration is good in both study areas. Species distribution was uneven and the spatial dispersion of trees was random. Dipterocarpaceae is the dominant family and Shorea is the dominant genus. The fragmented forests exhibit high species diversity. The Jaccard's similarity coefficient was low, revealing that the species composition between the two forests varies. The fragmented forests appear to be undergoing self-sustaining forest recovery. Stand characteristics, floristic diversity and species distribution patterns have provided valuable insights into fragmented forests' ecological and health status. High conservation values areas in oil palm plantations are vital in conserving plant biodiversity.
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