These factors thus modulate the climatic influence on tree ring isotopes. ![]() The difference between them, the thickness of the vadose zone, controls total soil moisture retention capacity. ![]() The latter represents the upper limit of the phreatic zone and therefore controls access to shallow groundwater. This influence depends strongly on local (tree level) conditions including floodplain surface elevation and subsurface gravel layer elevation. 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. ![]() 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. 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. Climatic and hydrologic shifts alter water distribution between floodplain storage reservoirs (e.g., vadose, phreatic), affecting water availability to tree roots. ![]() Seasonal and annual partitioning of water within river floodplains has important implications for ecohydrologic links between the water cycle and tree growth.
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