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dc.contributor.authorSinger, Michael Bliss
dc.contributor.authorSargeant, Christopher
dc.contributor.authorPiegay, Herve
dc.contributor.authorRiquier, Jeremie
dc.contributor.authorWilson, Rob
dc.contributor.authorEvans, Cristina Megan
dc.identifier.citationSinger , M B , Sargeant , C , Piegay , H , Riquier , J , Wilson , R & Evans , C M 2014 , ' Floodplain ecohydrology : climatic, anthropogenic, and local physical controls on partitioning of water sources to riparian trees ' , Water Resources Research .
dc.identifier.otherORCID: /0000-0003-4486-8904/work/59953627
dc.descriptionThis research was financially supported by Observatoire Hommes/Milieux Vallee du Rhone, The Royal Society (RG100590), The Carnegie Trust for the Universities of Scotland, and the Rhone-Alpes region via the ARC Environment program 2013. We also acknowledge NERC PhD studentship support to Sargeant and Evans.en
dc.description.abstractSeasonal and annual partitioning of water within river floodplains has important implications for ecohydrologic links between the water cycle and tree growth. Climatic and hydrologic shifts alter water distribution between floodplain storage reservoirs (e.g., vadose, phreatic), affecting water availability to tree roots. Water partitioning is also dependent on the physical conditions that control tree rooting depth (e.g., gravel layers that impede root growth), the sources of contributing water, the rate of water drainage, and water residence times within particular storage reservoirs. We employ instrumental climate records alongside oxygen isotopes within tree rings and regional source waters, as well as topographic data and soil depth measurements, to infer the water sources used over several decades by two co-occurring tree species within a riparian floodplain along the Rhône River in France. We find that water partitioning to riparian trees is influenced by annual (wet versus dry years) and seasonal (spring snowmelt versus spring rainfall) fluctuations in climate. This influence depends strongly on local (tree level) conditions including floodplain surface elevation and subsurface gravel layer elevation. The latter represents the upper limit of the phreatic zone and therefore controls access to shallow groundwater. The difference between them, the thickness of the vadose zone, controls total soil moisture retention capacity. These factors thus modulate the climatic influence on tree ring isotopes. Additionally, we identified growth signatures and tree ring isotope changes associated with recent restoration of minimum streamflows in the Rhône, which made new phreatic water sources available to some trees in otherwise dry years.
dc.relation.ispartofWater Resources Researchen
dc.subjectTree ringsen
dc.subjectOxygen isotopes (δ18O)en
dc.subjectWater partitioningen
dc.subjectClimate changeen
dc.subjectSoil moistureen
dc.subject1813 Eco-hydrologyen
dc.subject1807 Climate impactsen
dc.subject1820 Floodplain dynamicsen
dc.subject1803 Anthropogenic effectsen
dc.subjectGE Environmental Sciencesen
dc.subjectSDG 13 - Climate Actionen
dc.titleFloodplain ecohydrology : climatic, anthropogenic, and local physical controls on partitioning of water sources to riparian treesen
dc.typeJournal articleen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Sustainability Instituteen
dc.description.statusPeer revieweden

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