Experimental watershed of deciduous forest


cited from Kabeya et al.(2012)
Experimental watershed of deciduous forest

We measure the runoff at O Krieng (OK) and the rainfall at O Krieng Forest Office (OKF) shown in felt figure (Kabeya et al., 2012).
O Krieng (OK)
Area of the watershed: 2245km2
Forest canopy of the deciduous experimental forest


Although the color of the forest is brown in the dry season (left picture), it is green in the wet season (right picture). Details of the stand is as follows (Iida et al., 2012b):
Main species
Dipterocarpus tuberculatus., Terminalia tomentosa
Stand density
350 trees/ha
Mean diameter at breast height
24.5 cm
Mean tree height
11.3 m
LAI
1.3(wet season)
30-m-high tower for measuring evapotranspiration (12°55′N, 106°11′E)

We measure the evapotranspiration by the energy balance and bowen ratio method and the bandpass eddy covariance method and general factors of micrometeorology (Iida et al., 2012a).

Main equipments
ultrasonic anemo-thermometer, ventilated psychrometer, capacitance hygrometer, net radiometer,
pyranometer, pyrgeometer, quantum sensor, three-cups anemometer, wind vane
and rainfall gauge.
Measurement plot for rainfall interception in the deciduous forest site

We evaluate the interception loss near the tower (Iida et al., 2011; Iida et al., 2012b).
Sap flow measurements by Granier method are carried out to estimate the amount of transpiration (Iida et al., 2012a; Iida et al., 2013a).

cited from Ohnuki et al. (2008a)
Soil profiles and soil hardness in the deciduous forest

The left picture is the soil profile of Plinthosols, which has an accumulation layer of iron, so called plinthite, and much clay content. The right picture is the soil profile of sandy soils, called Arenosols, which distributed at near streams. Both soils have shallower soil thickness than Acrisols at the evergreen forest in Kampong Thom Province (Ohnuki et al., 2008a).

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