Keywords :
Dry deciduous forest,
Dry evergreen forest,
Soil depth,
Soil physical property,
Soil water content
บทคัดย่อ :
In several areas in Northeast Thailand, evergreen
and deciduous forests coexist under uniform climatic con-
ditions. To identify the factors that determine the distribution
of these different forest types, we compared soil depth and
soil physical properties between evergreen and deciduous
forests, and monitored soil moisture conditions for a year in
both forest types at the Sakaerat Environmental Research
Station. The soil was significantly deeper under the ever-
green forests (mean 97 cm) than under the deciduous forest
(mean 64 cm). The soil under the evergreen forests retained
much more water throughout the year than the soil under the
deciduous forest, and there was also a clear tendency for the
evergreen forests to occur in ravine areas, regardless of soil
depth. It is possible that the evergreen trees can maintain
transpiration during the dry season on thicker soils or in
ravine areas, whereas shallower soils cannot provide enough
water for these trees to maintain their evapotranspiration
during the dry period. From the present study, we showed
that soil water availability could be a significant factor
determining the distribution of the deciduous and evergreen
forests in our catchments.
เอกสารอ้างอิง :
Murata, N., Ohta, S., Ishida, A., Kanzaki, M., Wachirinrat, C., Artchawakom, T., & Sase, H. (2012). Soil depth and soil water regime in a catchment where tropical dry evergreen and deciduous forests coexist. Journal of forest research, 17(1), 37-44.
