Southern Sierra Annual Meeting Critical Zone Tree (CZT-1) Update

Southern Sierra Annual Meeting Critical Zone Tree (CZT-1) Update

Southern Sierra Annual Meeting Critical Zone Tree (CZT-1) Update Hopmans, Hartsough, Malazian, Nasta, Albane, Tamir and Katya UC Davis Sept. 8, 2009 4 MPS-1, 30cm 3

Vertical pit, 4 MPS-1 and 4 EC5-TE probes, 15cm, 30cm, 60cm, 90cm 1 conduit will carry wires from two transects UCM pits Transect radius = 5m 80cm N

5 2 Tensiometers 1 6 VP1

VP2 CR1000 7 VP4 12 VP5 VP3 8

CR1000 Three logger boxes house 2 CR1000s, 6 mulitplexers and a 2 RF 450 radios 11 10 9 VP6

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

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 CZT-1 30cm

Temperature Volumetric Water Content Soil Water Potential 1 mm/d 0.3 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) Tensiometer_MPS Comparison 0 -10 -20 Tenisometer Reading (kPa)

-30 1-1 -40 2-1 -50 4-1 5-1 -60

6-1 1-2 -70 2-2 4-2 -80 5-2 6-2

-90 1:1 Line -100 -110 -120 -120 -110 -100

-90 -80 -70 -60 -50 -40 MPS-1 Factory Calibration (kPa)

-30 -20 -10 0 OUTFLOW METHOD BUCHNER FUNNEL Optimization of hydraulic function parameters, by fitting measured with simulated drainage flow rates

O(b) = WiQo(ti) Qc(ti,b)2 Soil water retention and unsaturated hydraulic conductivity relationships 0.45 estimated WRC measured points wc(h=-100 cm) 0.40 0.35 0.30 0.25

0.20 0.15 0.10 0.05 0.00 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.E-01 h (cm) estimated HCC

1.E-04 qr 0.132 hg n m qs 50.3

2.18 0.541 0.415 Ks (cm/min) 0.0384 K(cm/min) q 1.E-07

1.E-10 1.E-13 1.E-16 1.E-19 1.E-02 1.E+00 1.E+02 h(cm) 1.E+04

1.E+06 Depth to Bedrock CZO Tree Radar Inc. Near-future activities planned September 2009

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

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