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Changing forest water yields in response to climate warming: results from long-term experimental watershed sites across North America Public Deposited

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  • Climate warming is projected to affect forest water yields but the effects are expected to vary. We investigated how forest type and age affect water yield resilience to climate warming. To answer this question, we examined the variability in historical water yields at long‐term experimental catchments across Canada and the United States over 5‐year cool and warm periods. Using the theoretical framework of the Budyko curve, we calculated the effects of climate warming on the annual partitioning of precipitation (P) into evapotranspiration (ET) and water yield. Deviation (d) was defined as a catchment's change in actual ET divided by P [AET/P; evaporative index (EI)] coincident with a shift from a cool to a warm period – a positive d indicates an upward shift in EI and smaller than expected water yields, and a negative d indicates a downward shift in EI and larger than expected water yields. Elasticity was defined as the ratio of interannual variation in potential ET divided by P (PET/P; dryness index) to interannual variation in the EI – high elasticity indicates low d despite large range in drying index (i.e., resilient water yields), low elasticity indicates high d despite small range in drying index (i.e., nonresilient water yields). Although the data needed to fully evaluate ecosystems based on these metrics are limited, we were able to identify some characteristics of response among forest types. Alpine sites showed the greatest sensitivity to climate warming with any warming leading to increased water yields. Conifer forests included catchments with lowest elasticity and stable to larger water yields. Deciduous forests included catchments with intermediate elasticity and stable to smaller water yields. Mixed coniferous/deciduous forests included catchments with highest elasticity and stable water yields. Forest type appeared to influence the resilience of catchment water yields to climate warming, with conifer and deciduous catchments more susceptible to climate warming than the more diverse mixed forest catchments.
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  • Creed, I. F., Spargo, A. T., Jones, J. A., Buttle, J. M., Adams, M. B., Beall, F. D., ... & Yao, H. (2014). Changing forest water yields in response to climate warming: Results from long‐term experimental watershed sites across North America. Global Change Biology, 20(10), 3191-3208. doi:10.1111/gcb.12615
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  • 20
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  • 10
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  • We thank the University of Western Ontario International Research Award, NSERC Discovery Grant, and Canadian Network of Aquatic Ecosystem Services NSERC Strategic NetworkGrant for grants to IFC; the Network of Centres of ExcellenceSustainable Forest Management for support that led to thecreation of the HELP database for Canadian catchments; andthe Long Term Ecological Research Network, US Forest Service,and US Geological Survey for access to the databases for UScatchments. We also thank the US National Science Foundationand Long Term Ecological Research Network for support of the workshops that led to this collaboration.
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  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-10-17T16:15:16Z (GMT) No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JonesJuliaCEOASChangingForestWater.pdf: 777320 bytes, checksum: e051142a136d909ce99f8290d7b748cc (MD5) JonesJuliaCEOASChangingForestWater_TableS1.pdf: 114673 bytes, checksum: d07c758b4b913d23fb507547cd0d1d7e (MD5)
  • description.provenance : Made available in DSpace on 2014-10-17T16:15:16Z (GMT). No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JonesJuliaCEOASChangingForestWater.pdf: 777320 bytes, checksum: e051142a136d909ce99f8290d7b748cc (MD5) JonesJuliaCEOASChangingForestWater_TableS1.pdf: 114673 bytes, checksum: d07c758b4b913d23fb507547cd0d1d7e (MD5) Previous issue date: 2014-10
  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-10-17T16:15:02Z No. of bitstreams: 3 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) JonesJuliaCEOASChangingForestWater.pdf: 777320 bytes, checksum: e051142a136d909ce99f8290d7b748cc (MD5) JonesJuliaCEOASChangingForestWater_TableS1.pdf: 114673 bytes, checksum: d07c758b4b913d23fb507547cd0d1d7e (MD5)

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