Field Notes
<--2001-01-03 09:00:00 | 2001-01-30 09:00:00-->Other sites visited today: Vaira
Tonzi: 2001-01-05 09:00:00 (DOY 5)
Author: Dennis Baldocchi
Others:
Summary: Calibration of theta probes; issues with soil cores as A1 coefficient was too high (10).
The solar array is powering the Campbell data loggers. Two systems are running. One with four Tsoil probes and a pressure sensor. The other with 5 Theta probes. The Theta probes were calibrated and buried
Calibration of theta probes. Took soil sample, damp and read it with all the sensors. There is some concern about how packed the sample is in how it affects the readings. Not sure how well we mimicked real field bulk density. The sensors were then buried.
Wet sample: 425.96 g Dry sample: 377.11 g Vessel (w/o cap): 35.14 g Volume of Vessel: 310 ml Gravometric water content, (w-d)/d=0.1428 Volumetric water content (Θ0) = (w-d)/V=0.157 The dry values of √ε0 are reasonable and are in the range of 1.6 for mineral and 1.3 for organic soils. Using data from Vaira for now,√ε0=1.5. dieletric constant (√ε1) =1.07+6.4v-6.4v2+4.7v3= Estimate of Bulk Density, d/V = (377.11-35.14)/260=1.315 Θ = (1.1 + 4.44V - a0) / a1 where The manual says the A1 coefficient is typically between 7.6 and 8.6, our numbers are closer to 10. Note sure if they are high because we may have artificially compacted the soil to put the samples into the vessel. Note the soil is very compacted and when we dig cores of soil, they come out as large distinct clods. Breaking them up produces large air spaces. If we compare the clods to remove the air spaces, then we may be compressing them more than how they were in the field. It is a tough sampling issue to obtain a representative value. |
Field Data
No tank data
No TZ Well data found
No TZ Moisture Point data found
No VR Moisture Point data found
No TZ grass heigth found
No VR grass heigth found
Tree DBH
| Date | Tag# | Reading (mm) |
|---|
No water potential data found
No TZ Grass Biomass data found
No TZ OakLeaves Biomass data found
No TZ PineNeedles Biomass data found
0 photos found
16 sets found
No data found for TZ_Fenergy.
No data found for TZ_tmet.
No data found for TZ_soilco2.
Can't check TZ_mixed
3 TZ_mixed graphs found
No data found for TZ_fflux.
No data found for TZ_fmet.
No data found for TZ_tram.
No data found for TZ_co2prof.
No data found for TZ_irt.
No data found for TZ_windprof.
No data found for TZ_tflux.
No data found for TZ_sm.
Can't check TZ_met
1 TZ_met graphs found
Can't check TZVR_mixed
No data found for TZ_osu.
No data found for TZ_fd.
Tonzi Z-cam data