Temporal variations of isotopic compositions in gross rainfall, throughfall, and stemflow under a Japanese cedar forest during a typhoon event
May 31st, 2011
Reo Ikawa, Takahiro Yamamoto, Jun Shimada and Takanori Shimizu
Release Date: May 31, 2011
Temporal variations of isotopic compositions in gross rainfall, throughfall, and stemflow under a Japanese cedar forest during a typhoon event
Reo Ikawa1), Takahiro Yamamoto1), Jun Shimada2) and Takanori Shimizu3)
1) Geological Survey of Japan, AIST
2) Kumamoto University, Graduate School of Science and Technology
3) Forestry and Forest Products Research Institute
(Received: February 22, 2011)
(Accepted for publication: May 23, 2011)
Abstract:
To examine the cause of isotopic difference among gross rainfall, throughfall and stemflow, water sampling with high temporal resolution was conducted in a Japanese cedar forest during a typhoon event. In this event, δ18O variation of throughfall was similar to that of gross rainfall except for the beginning of the rainfall event. However, isotopic fluctuations of stemflow differed from those of gross rainfall and throughfall throughout the event, although the temporal trend of stemflow volume was similar to that of gross rainfall and throughfall volumes. Comparisons between the observed δ18O of stemflow and that estimated by a model simulation suggests that isotopic difference between stemflow and gross rainfall or throughfall is caused principally by mixing of waters within canopy and stem storage along their flow paths with secondary effects of evaporation and isotopic exchange with ambient water vapor.
To cite this article:
Reo Ikawa, Takahiro Yamamoto, Jun Shimada and Takanori Shimizu: “Temporal variations of isotopic compositions in gross rainfall, throughfall, and stemflow under a Japanese cedar forest during a typhoon event”, Hydrological Research Letters, Vol. 5, pp.32-36, (2011) .
doi:10.3178/hrl.5.32
JOI JST.JSTAGE/hrl/5.32
Copyright (c) 2011 Japan Society of Hydrology and Water Resources