HOME : RESEARCH : River Systems RESEARCH • Research Overview • Basin-scale Water Balance • River Systems • Integrated Modeling • Micrometeorological Towers • Research Data • Scenario Development Upland semiarid ecosystems' water and carbon dioxide exchange Macro Theme Area: River Systems [Project ID: R36] PI: Russ Scott CO-PI(s): Travis Huxman, David Williams Basin focus: Regional SW Specific area in basin / field sites: Mesquite savanna site is within the U of A's Santa Rita Experimental Range. The desert grassland site is within the Kendall subwatershed in the Walnut Gulch Experimental Watershed (USDA) Summary/Goals: Evaluate the consequences of woody plant encroachment on water and CO2 exchange and determine the mechanisms that give rise to changes in ecosystem functioning. Activities and outcomes during past year: The Santa Rita mesquite savanna site was established in January, 2004 and continuous flux monitoring since then is on-going. Eddy covariance monitoring at the Kendall desert grassland site began in Spring, 2004 and is on-going. An intensive field study was carried out in summer 2005 at the Kendall site to quantify soil evaporation and partition ET fluxes. Plans for the upcoming year: Continued eddy covariance monitoring Quantify the effect of mesquite hydraulic redistribution on ecosystem water balance. Grassland ET partitioning experiment results anticipated in 2006. PARTICIPANTS NAME CATEGORY INSTITUTION William Cable  Other research scientist  USDA  Jessica Cable  Graduate student  University of Arizona  Kristin Green  Graduate student  University of Arizona  Travis Huxman  Faculty  University of Arizona  Daniel Potts  Graduate student  University of California Irvine  Victor Resco de Dios  Graduate student  University of Wyoming  Wei Sun  N/A  University of Wyoming  David Williams  Faculty  University of Wyoming  PARTNERS / ORGANIZATIONS UofA College of Agriculture Organization Involvement: N/A Shared Resources / Joint Activities: N/A Location: N/A, N/A, N/A URL: N/A USDA-ARS Walnut Gulch Experimental Watershed Organization Involvement: N/A Shared Resources / Joint Activities: N/A Location: Tucson, AZ, USA URL: N/A University of Wyoming Organization Involvement: The Williams lab has committed to full-time graduate students to this work Shared Resources / Joint Activities: N/A Location: Laramie, WY, USA URL: http://www.uwyo.edu/dgw/index.html MEDIA / PUBLICITY None reported   ©2004 SAHRA. Arizona Board of Regents

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