The role of pre-event canopy storage in throughfall and stemflow by using isotopic tracers Public Deposited

http://ir.library.oregonstate.edu/concern/articles/kw52j993s

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by John Wiley & Sons Ltd. and can be found at:  http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291936-0592.

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  • Stable isotopes can be a valuable tool for tracing the redistribution, storage, and evaporation of water associated with canopy interception of rainfall. Isotopic differences between throughfall and rainfall have been attributed to three mechanisms: evaporative fractionation, isotopic exchange with ambient vapor, and temporal redistribution. We demonstrate the potential importance of a fourth mechanism: rainfall mixing with water retained within the canopy (in bark, epiphytes, etc.) from prior rain events. Amount and isotopic composition (¹⁸O and ²H) of rainfall and throughfall were measured over a 3-month period in a Douglas-fir forest in the Cascade Range of Oregon, USA. The range of spatial variability of throughfall isotopic composition exceeded the differences between event-mean isotopic compositions of rainfall and throughfall. Inter-event isotopic variation of precipitation was high and correlated with the isotopic deviation of throughfall from rainfall, likely related to a high canopy/bark storage capacity storage bridging events. Both spatial variability of throughfall isotopic composition and throughfall–precipitation isotopic differences appear to have been controlled by the temporally varying influence of residual precipitation from previous events. Therefore, isotopic heterogeneity could indicate local storage characteristics and the partitioning of flow-paths within the canopy.
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  • Allen, S. T., Brooks, J. R., Keim, R. F., Bond, B. J. and McDonnell, J. J. (2014), The role of pre-event canopy storage in throughfall and stemflow by using isotopic tracers. Ecohydrology, 7: 858–868. doi:10.1002/eco.1408
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-05-27T17:07:07Z No. of bitstreams: 1 BondBarbaraForestryRolePre-EventCanopy.pdf: 808349 bytes, checksum: 5ce29ba73079e8cb136e1bf803ed9b7e (MD5)
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-05-27T17:07:17Z (GMT) No. of bitstreams: 1 BondBarbaraForestryRolePre-EventCanopy.pdf: 808349 bytes, checksum: 5ce29ba73079e8cb136e1bf803ed9b7e (MD5)

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