Walker river basin project agriculture restoration and plant soil water interactions
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Walker River Basin Project Agriculture, Restoration, and Plant/Soil/Water Interactions. Tasks 4 & 5 Summary 2008. Objectives. Task 4: Cultural practices and economic potential of alternative low water use crops Biomass production Water use and water use efficiency

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Walker River Basin ProjectAgriculture, Restoration, and Plant/Soil/Water Interactions

Tasks 4 & 5

Summary

2008


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Objectives

Task 4:

  • Cultural practices and economic potential of alternative low water use crops

    • Biomass production

    • Water use and water use efficiency

  • Best species and methods for native habitat restoration

    • Survey species composition (native and non-native) relative to time and hydrologic changes

    • Modeling


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Impact of hydrologic and land use changes on soils

Erosivity

Salinity / salt profile

Nutrient flux / budget

Organic matter

Water table

Temperature

Impact of hydrologic and land use changes on riparian zone

Invasive species

Nutrient flux

Species composition

Objectives

Task 5:


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Objectives

  • Tasks 4 & 5:

    • Combine data collected and implement in a model

    • Apply model to determine areas most suitable for land use change.

Land Use

Change


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Site Locations

  • Revegetation Only Site

  • Wildlife Management Sites

  • Well Site


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Site Locations

  • 5C Cottonwood – Vacant Lot

  • Ranch Sites

  • Valley Vista – Alfalfa Field


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Agricultural Studies

  • Biomass Study

    • 3 water treatments (50%, 75%, & 100%)

    • 15 vegetation types (alternative grains and potential bio-fuels)

  • Revegetation Study

    • 2 water treatments (0% & 25%)

    • 10 vegetation types (native grasses and shrubs)


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Site Locations

  • Riparian Zone:

    • One site located in Wildlife Management Area

    • Three transects perpendicular to Walker River


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Soil Sampling

  • Agricultural Sites

    • Collected ~1300 soil samples

    • 51 Bulk Density samples

    • 51 Infiltration tests

  • Riparian Site

    • 42 soil samples


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Instrumentation:Riparian Zone

  • Installed 7 shallow groundwater wells

  • Cored, tested, and approved 6 bore holes for push-pull tests


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Instrumentation: Soil Temperature Cable

  • Installed (Dec 2007)

    • Valley Vista

    • Wildlife Management Well


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Seeding

  • Cool season grasses and most revegetation grasses were planted Nov-Dec 2007


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Current Analysis

  • Riparian soils percent loss of organic matter due to combustion

  • C and N mineralization

  • Aggregate size fractionation

  • Soil water and exchange nutrient concentrations

  • Gas sample analysis

  • Soil textural analysis

  • Weed seed bank germination

  • Monthly water quality samples taken from the Walker River

  • Surveying of monitoring wells


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Coming This Spring!!!

  • Seeding of remaining crops (April-May)

  • Field Instrumentation

    • Soil trace gas flux rings

    • Portable CO2 sensor chamber

    • Groundwater monitoring wells on Wildlife Management sites

    • Dust collectors & weather station at Valley Vista site

    • Evapotranspiration tents at Valley Vista site


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