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Plants vs. Streams: Their groundwater-mediated competition at “El Morro”, a developing catchment in the dry plains of Argentina
The study analyzes the 'El Morro' catchment in Argentina, where the conversion of native forests to agriculture has led to rising water tables and the emergence of new streams. The authors identify five mechanisms of competition: plants taking water from streams via unsaturated uptake (mechanism 1), focalized saturated uptake in wetlands (mechanism 2), and distributed saturated uptake in forests (mechanism 3); and streams taking water from plants through streambed deepening (mechanism 4) and sediment deposition (mechanism 5). Findings indicate that while unsaturated uptake previously suppressed streamflow, current high water tables have made saturated uptake by forests and wetlands significant, though deepening streams are now actively reclaiming water by lowering local water tables.
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Document type: Research paper