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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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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 PlateauEco-hydrology of Karst Shrublands


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

  • 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


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

* Rivers 100% appropriated


North llano watershed

Semi-arid environment

Perennial baseflow

North Llano Watershed


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

Period of record

Period of record (1916-2000)


What is the interaction of shrubs and hydrology given this type of flow regime

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


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

rainfall

Juniper influence on hydrologic cycle

evaporation

intercepted

throughfall

stemflow

litter

Soil or runoff


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

* 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.)


Randy mayer and bradford wilcox tx a m university department of rangeland ecology and management

atatat


Preliminary conclusions

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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