As hypothesized, tree communities with D. oliveriwere functions
of existing environmental gradients. The main environmental
gradient to which species responded in the study area is one of
relative rich, deep soils in valleys of ephemeral streams to poor,
shallow soils on ridges (Fig. 3). MDF occurred on deeper soils of the
foothills and on less exposed slopes, while dry deciduous
dipterocarp forest (DDFd) occurred on ridge tops and on the driest
or steepest slopes with shallowsoil (see also Santisuk, 1988; Ashton,
As hypothesized, tree communities with D. oliveriwere functionsof existing environmental gradients. The main environmentalgradient to which species responded in the study area is one ofrelative rich, deep soils in valleys of ephemeral streams to poor,shallow soils on ridges (Fig. 3). MDF occurred on deeper soils of thefoothills and on less exposed slopes, while dry deciduousdipterocarp forest (DDFd) occurred on ridge tops and on the driestor steepest slopes with shallowsoil (see also Santisuk, 1988; Ashton,
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