Table 1.

Abundance and distribution of the Dipterocarp species used in this study. Data on abundance and distribution were obtained from Meijer & Wood (1964), Ashton (1982) and Newman et al. (1999 & 1998)

Genus	Species	Abundance and distribution
Dryobalanops	lanceolata	Widespread on fertile soils, abundant on undulating land, to 700 m
Dipterocarpus	conformis	Rare, hill dipterocarp forest, clay-rich soils, below 800 m
Hopea	sangal	Often on or near river banks in low country and to 500 m
Parashorea	tomentella	Common on flat to rolling hills below 200 m
Parashorea	malaanonan	Local on clay-rich soil, rarely on riverbanks, on ridges in mountains to 1350 m
Shorea	beccariana	Common, lowlands, and dry ridges to 1350 m
Shorea	argentifolia	Locally frequent on ridges, hillsides, and valleys, usually below 600 m
Shorea	faguetiana	Low hills and particularly ridge tops at 150–700 m, occasionally to 1000 m
Shorea	gibbosa	Locally common on the most fertile clay-loam soils on undulating land and river banks to 650 m
Shorea	johorensis	Very common on well-drained fertile soils below 600 m
Shorea	leprosula	Widespread, fast-growing emergent, common below 700 m
Shorea	macroptera	Common, sandy clay soils on low hills to 600 m
Shorea	ovalis	Scattered, usually in moist places in valleys and low-lying ground, occasionally ultrabasics, to 500 m
Shorea	parvifolia	Perhaps the commonest dipterocarp, on clay soils on hills below 800 m
Shorea	macrophylla	Locally abundant on periodically flooded alluvium and near rivers, uncommon on hillsides, below 600 m