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Randy Mayer and Bradford Wilcox TX A&M University Department of Rangeland Ecology and Management

Randy Mayer and Bradford Wilcox TX A&M University Department of Rangeland Ecology and Management. Streamflow Characteristics of Individual Watersheds on the Edwards Plateau Eco-hydrology of Karst Shrublands. Climate: precipitation, 375-800mm

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Randy Mayer and Bradford Wilcox TX A&M University Department of Rangeland Ecology and Management

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  1. Randy Mayer and Bradford Wilcox TX A&M University Department of Rangeland Ecology and Management Streamflow Characteristics of Individual Watersheds on the Edwards PlateauEco-hydrology of Karst Shrublands

  2. Climate: precipitation, 375-800mm temperature, 18-20 degrees C • Geology: Edwards & Glen Rose limestones with large areas exposed • Soils: Shallow calcareous, rocky, underlain by fractured limestone

  3. * Rivers 100% appropriated

  4. Semi-arid environment Perennial baseflow North Llano Watershed

  5. Period of record Period of record (1916-2000)

  6. What is the Interaction of Shrubs and Hydrology Given this Type of Flow Regime? • Widespread conversion of grasslands and savannas to shrublands in the last 100 years. • Mesquite, ashe and redberry juniper • Dramatic shift of herbivory and fire regime PreliminaryAnalysis of Vegetation, Patch Analyst 1966 1995 2% increase in shrub density

  7. rainfall Juniper influence on hydrologic cycle evaporation intercepted throughfall stemflow litter Soil or runoff

  8. * Juniper interception is significant for small events, but has less influence on larger events JuniperInterception Percentinterception * Keith Owens, TX A&M Research Center (Uvalde) Precipitation events (in.)

  9. atatat

  10. It appears that the runoff necessary to fill reservoirs on the Edwards Plateau is generated by large precipitation events. Surface cover has less influence on these large events than the small events. While there are many benefits to shrub control in the North Llano basin, increasing regional water yield does not appear to be one of them. Preliminary Conclusions

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