Southern Sierra Annual Meeting Critical Zone Tree (CZT-1) Update Hopmans, Hartsough, Malazian, Nasta, Albane, Tamir and Katya UC Davis Sept. 8, 2009.

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Presentation transcript:

Southern Sierra Annual Meeting Critical Zone Tree (CZT-1) Update Hopmans, Hartsough, Malazian, Nasta, Albane, Tamir and Katya UC Davis Sept. 8, 2009

MPS-1, 30cm Vertical pit, 4 MPS-1 and 4 EC5-TE probes, 15cm, 30cm, 60cm, 90cm 1½” conduit will carry wires from two transects UCM pits Tensiometers Transect radius = 5m 80cm CR1000 N Three logger boxes house 2 CR1000s, 6 mulitplexers and a 2 RF 450 radios VP1 VP2 VP3 VP4 VP5 VP6

50m Flux tower and Met Station Sap flow sensors 150 soil moisture and water potential sensors Water balance instrument clusters

150 Soil Sensors at the site Decagon Echo 5TE, MPS-1 Sensors as well as tensiometers

CZT-1 30cm Temperature Volumetric Water Content Stem Water Potential

Temperature Volumetric Water Content Soil Water Potential CZT-1 30cm

0.3 mm/d 1 mm/d 0.5 mm/d

Tree Instrumentation and Measurements

Stem Water Potential

Sap Flux

Comparison of tensiometer with MPS (Uncertainty is about 100 cm in wet range)

OUTFLOW METHOD – BUCHNER FUNNEL

O(b) =   W i  Q o (t i ) – Q c (t i,b)  2 Optimization of hydraulic function parameters, by fitting measured with simulated drainage flow rates

Soil water retention and unsaturated hydraulic conductivity relationships

Depth to Bedrock CZO

Tree Radar Inc.

LIDAR – LAI estimates for tree canopy geometry and evapotranspiration modeling; Install additional sapflow instrumentation Laboratory measurements of TDR, heatpulse, electrical resistance and sapflow in destructive tree wood samples; Evaluate soil moisture instrumentation results – EchoTE and MPS; Coupled three-dimensional modeling of coupled soil-tree trunk system as a integrated porous domain with atmospheric boundary condition; Measurement of soil hydrologic properties and drainage fluxes; Collaborate with Christine on RHESsys watershed-scale modeling of soil moisture Near-future activities planned – September 2009