Field Notes

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Tonzi: 2005-06-23 10:30:00 (DOY 174)
Author: Dennis Baldocchi
Others: Xinghuan Chen, Gretchen Miller

Field notes June 23, 2005
D174

Tonzi Ranch

Today is the big Isotope study. Dawson and Biomet lab are in force.

Ddb, Xinghuan Chen and Gretchen Miller arrived around 1030 to do soil moisture, download data and check flux system.

Mostly clear day, mild winds, moderate temperature (up to 31 C) and low humidity.

Downloaded flux data on tower and floor.

CO2 cal was reading 427.23
CO2 zero was -1.6

Tower

W: -.67; u: 2.4; v: -.43; T: 23.7; q: 3.1; C: 1.5

Floor

W: 0.02; u: .1; v: 0.05; T: 30.2; q: 2.17; c: 1.31

Checked soil CO2 probes. They all seem to be working, with nice gradients. Only concern is sensor #4 under the tree. It was reading 42 mv, but the probe was saying it was about 1700 ppm, which on a 20,000 ppm scale over 5000 mv should be 420 mv. I am wondering if there is a factor 10 divide in the program, or if the resistor is different for that sensor. It seems to be working otherwise.

In Pm Matthias came took spectral reflectance measurements.

Jessica was measuring A/Ci and fluorescence

Jorge was measuring soil respiration and soil Keeling plots

Alex was measuring sugars and sap isotope content.

Todds group had an REA and canopy profile system operating for Keeling plots.

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

No TZ Tree DBH found

No water potential data found

No TZ Grass Biomass data found

No TZ OakLeaves Biomass data found

No TZ PineNeedles Biomass data found