A Paired-catchment Experiment In The
Tatsunokuchi-yama Experimental Forest,
Japan: The Influence Of Forest Disturbance On
Water Discharge
Author(s)
K. Tamai
Abstract
We proposed a new index for estimating the short-term influence of forest
disturbance on discharge rates. The new index was based on the comparison of
discharge duration curves between paired-catchment. Using this index, the
influence of slight disturbance and recovery speed from disturbance was
estimated for a 22.61 ha watershed in Japan as follows.
1) The discharge rate was increased by forest extinction in areas larger than 3.45
ha.
2) The establishment of a hinoki plantation, in combination with the lack of live
stem clearing, and hinoki thinning did not influence the discharge rate.
3) The influence of pine die-off on low and drought water discharge remained
even 20 yrs after disturbance, probably because of the absence of afforestation
following the disturbance.
4) Afforestation following disturbance leads to a rapid decrease in discharge rate.
Keywords: paired-watershed experiment, discharge duration curve, forest
management.
1 Introduction
Forests influence water discharge via transpiration and infiltration into deeper
soil. The former process results in decreased discharge rates, especially peak
discharge, and thereby contributes to flood prevention. The latter process delays
water discharge and is thought to increase base flow. Therefore, forests affect
base flow antithetically, both decreasing it by transpiration and increasing it by
Keywords
paired-watershed experiment, discharge duration curve, forestmanagement.
Related Book
Other papers in this volume
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