Hydrological Research Letters
Online ISSN : 1882-3416
ISSN-L : 1882-3416
Long-term effects of evapotranspiration on the flow duration curve in a coniferous plantation forest over 40 years
Kenji TsurutaYoshiko KosugiMasanori KatsuyamaKen’ichirou KosugiMasakazu SuzukiMakoto Tani
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JOURNALS OPEN ACCESS
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2020 Volume 14 Issue 1 Pages 1-8

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Abstract

We quantified long-term trends in evapotranspiration, runoff, and deep percolation using 40 years of hydrological data, examining the effects of evapotranspiration on runoff during forest development in a coniferous species. Using the flow duration curve, we evaluated the effects of evapotranspiration on the entire range of flow stages (high to low flows). During the 40-year forest development, deep percolation ranged from 97 mm to 105 mm. Annual evapotranspiration increased by 623–766 mm, which appeared to be caused by increased air temperature as well as forest development. Annual runoff consequently decreased by 937–777 mm. In particular, pronounced decreases in daily flow were found with an exceedance probability of >11% in the flow duration curve. Long-term effects of evapotranspiration on runoff during forest development continued for a longer period than predicted by previous catchment studies of ~20 years duration. Our results suggest that the long-term patterns of evapotranspiration and runoff during forest development would differ from those reported by previous catchment studies under climate warming conditions and highlight the need for further research into separating the effects of forest development and increasing air temperature on evapotranspiration in long-term hydrological data.

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© 2020 The Author(s) CC-BY 4.0 (Before 2017: Copyright © Japan Society of Hydrology and Water Resources)
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