Field Notes
<--2001-05-10 12:00:00 | 2001-05-17 09:00:00-->Other sites visited today: Vaira
Tonzi: 2001-05-11 05:00:00 (DOY 131)
Author: Dennis Baldocchi
Others:
Summary: Slept through alarms and started pre-dawn water potentials late; pressure bomb tank ran out of gas after 3 trees, readings not completed.
| WHO: Nancy Kiang, Nina Kilham (technician in Tracy Benning's lab) WHERE: Tonzi Ranch WHEN: overnight, Thursday-Friday, 5/10-11/01 WEATHER: 94°F, clear, hot, ground dry and grasses turning brown in open areas WHAT: - Move sapflow sensors to fresh position on tree. - Measure pre-dawn water potential of sapflow trees - Measure LAI of sapflow trees - Take stem and soil samples for water isotopes. - Install dendrometer bands. 5:00, Pre-dawn water potential measurements started at 5:00 DST (unfortunately, we slept through our alarms, which were set to 4:00 am). Started measuring at Set Q, 2 leaves per sapflow tree: water potentials all around -2.0 to -2.5 bar. Ended measurements with Set P at 6:20 DST, sky already light but sun not risen yet. The water potentials at Set P were getting lower as the sky lightened, ending with -5.0 bar at 6:20 DST. 15:10 DST, Midday leaf water potentials started at Set P. Unfortunately, the pressure bomb tank ran out of gas after just measuring 3 trees. We re-filled the small canister at the lab and re-filled the pressure bomb on 5/10/01, but the tank only reached 500 bar, uncertain why. Next time, carefully check the pressure of the re-fill tank at the lab. Data are in TonziLeafWaterPotential.xls. Dendrometer bands Installed dendrometer bands on the following trees ~ 4 cm above position of sapflow sensors: Tree Band reading 248 250 72 5.3 77 5.1 79 5.2 Stayed Friday night 5/11/01 at the Jackson-Gold Lodge, (209) 223-0486 - very comfortable motel that will give us government discount. |
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) |
|---|
Water Potential - mode: raw
| Time< h> | Species | Tree | readings (bar) | ||
|---|---|---|---|---|---|
| 2001-05-11 06:00:00 | OAK | SETP | -3.4 | 0.27 | 8 |
| 2001-05-11 06:00:00 | OAK | SETQ | -2.7 | 0.64 | 6 |
| 2001-05-11 06:00:00 | PINE | 78 | -5.0 | ||
| 2001-05-11 12:00:00 | OAK | SETP | -20.5 | 2.28 | 8 |
| 2001-05-11 12:00:00 | PINE | 78 | -13.7 | 2.83 | 3 |
| OAK_SETP | Whole Study | 20010511 | 06:00:00 | twig/leaf cluster | -0.34 | 0.27 | 8 | |
| OAK_SETP | Whole Study | 20010511 | 12:00:00 | twig/leaf cluster | 2.7 | 5.04 | 3 | |
| OAK_SETQ | Whole Study | 20010511 | 06:00:00 | twig/leaf cluster | 2.1 | 3.39 | 3 | |
| PINE_78 | Whole Study | 20010511 | 06:00:00 | twig/leaf cluster | -0.5 | 1 | ||
| PINE_78 | Whole Study | 20010511 | 12:00:00 | twig/leaf cluster | 1.5 | 2.48 | 3 |
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.
8 TZ_fmet graphs found
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.
2 TZ_sm graphs found
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