A re-examination of data on structure and floristic composition of hill and lowland dipterocarp forest in Peninsular Malaysia

Manokaran N., . and Kochumen K.M., . A re-examination of data on structure and floristic composition of hill and lowland dipterocarp forest in Peninsular Malaysia. pp. 61-75. ISSN 0025-1291

Structure and floristic composition in hill dipterocarp forest in Bukit Lagong and two lowland dipterocarp forests at Sungai Menyala and Pasoh Peninsular Malaysia are compared. Tree densities at Bk. Lagong (494.0 ha (-1)) and Sg. Menyala (476.5 ha (-1)) were lower than that at Pasoh (545.5 ha (-1)). The density of emergent species as a group in both lowland sites was almost twice that in hill forest. Stocking of main canopy species was higher in hill forest than in lowland sites and understorey species were markedly more abundant at Pasoh. Secondary forest species were few at all three sites but their density was lower in the lowland sites. Basal area in hill forest at Bk. Lagong (41.11 m2 ha (-1)) was much higher than those at Sg. Menyala (31.81 m2 ha (-1)) and Pasoh (29.13 m2 ha (-1)). The Dipterocarpaceae dominated basal area forming 30.5 percent 38.4 percent and 31.0 percent of the total at Bk. Lagong Sg. Menyala and Pasoh respectively. Species richness in the three forests was variable within narrow limits with no clear differences between hill and lowland forests. The number of species in 2 ha plots varied between 232 and 276. The Dipterocarpaceae was the most common family in both Bk. Lagong and Sg. Menyala and was second only to the Euphorbiaceae in Pasoh contributing 11.5 percent 15.1 percent and 9.5 percent of trees respectively. Ordination by detrended correspondence analysis demonstrated that hill forest was different floristically from lowland forest - 95 species (37.5 percent of its total) present at Bk. Lagong were not present in the lowland forests.

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Abstract

Structure and floristic composition in hill dipterocarp forest in Bukit Lagong and two lowland dipterocarp forests at Sungai Menyala and Pasoh Peninsular Malaysia are compared. Tree densities at Bk. Lagong (494.0 ha (-1)) and Sg. Menyala (476.5 ha (-1)) were lower than that at Pasoh (545.5 ha (-1)). The density of emergent species as a group in both lowland sites was almost twice that in hill forest. Stocking of main canopy species was higher in hill forest than in lowland sites and understorey species were markedly more abundant at Pasoh. Secondary forest species were few at all three sites but their density was lower in the lowland sites. Basal area in hill forest at Bk. Lagong (41.11 m2 ha (-1)) was much higher than those at Sg. Menyala (31.81 m2 ha (-1)) and Pasoh (29.13 m2 ha (-1)). The Dipterocarpaceae dominated basal area forming 30.5 percent 38.4 percent and 31.0 percent of the total at Bk. Lagong Sg. Menyala and Pasoh respectively. Species richness in the three forests was variable within narrow limits with no clear differences between hill and lowland forests. The number of species in 2 ha plots varied between 232 and 276. The Dipterocarpaceae was the most common family in both Bk. Lagong and Sg. Menyala and was second only to the Euphorbiaceae in Pasoh contributing 11.5 percent 15.1 percent and 9.5 percent of trees respectively. Ordination by detrended correspondence analysis demonstrated that hill forest was different floristically from lowland forest - 95 species (37.5 percent of its total) present at Bk. Lagong were not present in the lowland forests.

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Item Type:	Article
Additional Information:	5 ill.; 5 tables; 31 ref. Summary (En)
AGROVOC Term:	BOSQUE TROPICAL HUMEDO
AGROVOC Term:	ZONA DE MONTANA
AGROVOC Term:	TIERRAS BAJAS
AGROVOC Term:	MALASIA PENINSULAR/ ESPECIES
AGROVOC Term:	ARBOLES FORESTALES
AGROVOC Term:	POBLACION VEGETAL
AGROVOC Term:	SOTOBOSQUE
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:55
URI:	http://webagris.upm.edu.my/id/eprint/20090

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