Physics – Geophysics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3518404j&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 18, CiteID L18404
Physics
Geophysics
7
Hydrology: Hydrogeophysics, Hydrology: Soil Moisture, Global Change: Land Cover Change, Global Change: Impacts Of Global Change (1225), Hydrology: Plant Uptake
Scientific paper
Changes in global climate and land use affect important processes from evapotranspiration and groundwater recharge to carbon storage and biochemical cycling. Near surface soil moisture is pivotal to understand the consequences of these changes. However, the dynamic interactions between vegetation and soil moisture remain largely unresolved because it is difficult to monitor and quantify subsurface hydrologic fluxes at relevant scales. Here we use electrical resistivity to monitor the influence of climate and vegetation on root-zone moisture, bridging the gap between remotely-sensed and in-situ point measurements. Our research quantifies large seasonal differences in root-zone moisture dynamics for a forest-grassland ecotone. We found large differences in effective rooting depth and moisture distributions for the two vegetation types. Our results highlight the likely impacts of land transformations on groundwater recharge, streamflow, and land-atmosphere exchanges.
Hyndman David W.
Jayawickreme Dushmantha H.
Van Dam Remke L.
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