| |
|---|---|
 (444KB)
|
27,785,000 Yen (FY 1998;9,231,000 Yen)
Species composition, diversity, and population structures of tree species were compared between a 4-ha regenerated (logged forest) plot and a 6-ha primary (natural forest) plot in a hill dipterocarp forest in Semangkok Forest Reserve, Peninsula Malaysia. Total number of species was larger in the primary plot (464 species) than the regenerating plot (421 species). In the primary plot, 170 of 464 species were specific to the plot, and 127 of 41)-1 species were specific to the regenerating plot. Total numbers of families and genera were larger in the regenerating plot. In the primary plot, species richness was as follows; Y = 464, ¦Á=26.7, and ¦Â=0.12. In the regenerating plot, ¦Ã=421, (¦Á=26.2, and ¦Â=0.16. Species diversity H' was slightly larger in the primary plot (H' = 5.28) than the regenerating plot (H'=5.13). However, species evenness J' was similar; 0.86 and 0.85 in the primary and regenerating plots, respectively. The composition of common 30 tree species remarkably altered between the plots. Shorea curtisii, which is the most important timber tree in the hill forests, was dominated in the primary plot. Macaranga triloba was the only light demanding tree species among the 30 species in the primary plot. On the contrary, pioneer or secondary tree species of Euphorbiaceae occupied the half of 30 common tree species in the regenerating plot. Size structures of emergent tree species (Shorea curtisii), canopy tree species (Antidesma cuspidatum) and typical light demanding tree species (Macaranga triloba) were compared between the two plots. Size structure of Shorea curtisii changed by selective cutting, but those of Antidesma cuspidatum and Macaranga triloba were not largely changed. Eco-physiological traits of these species were also investigated.
Hill dipterocarp forest, Selective logging, Pioneer species, Peninsula Malaysia