characteristics of stemflow for tall stewartia growing on a hillslope.pdf

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characteristics of stemflow for tall stewartia growing on a hillslope.pdf

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characteristics of stemflow for tall stewartia growing on a hillslope

Journal of Hydrology 378 (2009) 168–178Contents lists available at ScienceDirect Journal of Hydrology journal homepage: www.elsevier .com/locate / jhydrolCharacteristics of stemflow for tall stewartia (Stewartia monadelpha) growing on a hillslope Wei-Li Liang *, Ken’ichirou Kosugi, Takahisa Mizuyama Department of Forest Science, Graduate School of Agriculture, Kyoto University, Kyoto, Japan a r t i c l e i n f o s u m m a r yArticle history: Received 19 March 2009 Received in revised form 13 June 2009 Accepted 13 September 2009 This manuscript was handled by K. Georgakakos, Editor-in-Chief, with the assistance of Efrat Morin, Associate Editor Keywords: Deciduous broad-leaved tree Forested hillslope hydrology Rainfall partitioning Spatiotemporal variations0022-1694/$ - see front matter 2009 Elsevier B.V. A doi:10.1016/j.jhydrol.2009.09.027 * Corresponding author. Address: Lab. of Erosion C Science, Graduate School of Agriculture, Kyoto Unive Cho, Sakyo-Ku, Kyoto 606-8502, Japan. Tel.: +81 75 75 E-mail address: iritu@kais.kyoto-u.ac.jp (W.-L. LianThe characteristics of stemflow were observed in a tall stewartia (Stewartia monadelpha) deciduous forest on a hillslope in central Japan, revealing new findings for a previously unreported type of deciduous forest. Using 2-year observations of 250 rainfall events, we analyzed seasonal and spatial variations in stemflow for several trees, and applied additional data sets of throughfall and plant area index (PAI) to produce a rough estimate of seasonal variations in rainfall redistribution processes and canopy architec- ture for a single tree. Compared to previous findings for other deciduous tree species, the ratios of throughfall, stemflow, and interception to open-area rainfall obviously varied with PAI changes for tall stewartia. Meteorological conditions of rainfall amount, rainfall intensity, wind speed, and wind direction had little effect on stemflow generation, which was mainly affected by variation in canopy archit