J. Jpn. Soc. Soil Phys.
No. +*2, p. +3,2 ,**2
 !"#$%&'«¬ ­*ῌ ®¯°**ῌ ±²***ῌ³´µ***Inﬂuence Area of Stem Flow on a Soil of Deciduous Forest Floorby Electric Resistivity Survey and the Evaluation ofGroundwater Recharge through Stem FlowJun SHIMADA*, Kyoko OHSUMI**, Kazuhiko OHBA*** and Atsushi MARUYAMA**** Graduate school of Science and Technology, Kumamoto Univ., Kumamoto, 20*ῌ2///, Japan** Ashisuto, Co. Ltd. Tokyo, +*,ῌ2+*3, Japan*** Agricultural Meteorology laboratory, National Agricultural Research Center
for Kyushu- Okinawa region, Kumamoto, 20+ῌ++3,, JapanAbstract
The stem ﬂow is volumetrically much less than through fall and it was believed to be less wetaround a tree stem than the other part of the forest ﬂoor because of rainfall resistance of a tree
canopy and little contribution of stem ﬂow.

In the present study, the continuous resistivity

survey was conducted at the experimental deciduous forest along the one selected line for about+./ years’ intervals to observe the seasonal change of soil water content under the tree canopy.
The observation results were applied to evaluate the e#ect of the stem ﬂow on the shallow soil
water content around the selected trees.

The results clearly show that the downward soil waterﬂux under the tree canopy is ,., times larger than that of the no tree area in the study forest.

Byusing this downward ﬂux data with tree density in the study forest, the groundwater recharge
rate was calculated. The groundwater recharge through the stem ﬂow is nearly -3.+῍ in thetotal groundwater recharge in the study forest, which is completely larger than the tree densityof the study forest (*.++/ m,/m, (+.+/῍)).

This result clearly supports the e#ect of stem ﬂow on

the groundwater recharge in the forested area.
Key words : stem ﬂow, soil water content, groundwater recharge, resistivity survey

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forest ﬂoor area.

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