Effect of Soil Water Content on Water Storage Capacity: Comparison Between the Forested Areas in Cambodia and Japan

Preliminary study of flow regimes and stream water residence times in multi-scale forested watersheds of central Cambodia

“…The pore size distribution to 2 m in depth at an evergreen broadleaf forest was also measured; the volumetric ratio of each pore size from large ([-0.2 kPa) to fine (\-49 kPa) pores was relatively uniform with depth; total porosity was 0.32-0.44 m 3 m -3 , except in surface soils ). The saturated hydraulic conductivity was 1.0 9 10 -4 to 3.0 9 10 -6 m s -1 (i.e., 360-10.8 mm/h) to 0-60 cm in depth in forested areas of our study sites (Shinomiya et al 2007).…”

“…Araki et al (2007b) observed groundwater levels on a transect plot across a stream 7 km west from the Tower site; groundwater levels changed seasonally in a depth of 300 cm, and some parts on the transect plot were waterlogged when the groundwater table reached the surface in August. The saturated hydraulic conductivity of the top soil in forested parts of this area (360 mm/h; Shinomiya et al 2007) is more than twice larger than the observed maximum rainfall intensity (160 mm/h). Thus, a geomorphological control is probably in operation, with saturation-excess overland flow occurring when the groundwater table emerges at the surface in this area.…”

Long-term Hydrological Observations in a Lowland Dry Evergreen Forest Catchment Area of the Lower Mekong River, Cambodia

“…Soil thickness in the dry evergreen forest in this area is over 8 m, and the effective porosity of the soil is 0.13 m 3 m -3 (Ohnuki et al 2008). For the same study site, the saturated hydraulic conductivity was between 2.0×10 -5 m s -1 to 3.0×10 -6 m s -1 from the surface to a depth of 60 cm (Shinomiya et al 2007).…”