Field Notes
<--2001-07-05 19:45:00 | 2001-07-12 09:00:00-->Tonzi: 2001-07-06 02:20:00 (DOY 187)
Author: Nancy Kiang
Others: Jianwu Tang
Summary: Measured leaf water potentials; installed dendrometer bands.
| WHO: Nancy Kiang, Jianwu Tang (grad student in Ye Qi's lab) WHERE: Tonzi Ranch WHEN: Overnight at Jackson Gold Lodge, Thurs-Fri, 7/5-7/6/2001 WEATHER: Thurs 100°F, Fri 91°F WHAT: Measure pre-dawn and midday leaf water potentials and Leaf Area Index of transects. Install remaining dendrometer bands. Check status of sapflow sensors. Jianwu Tang also measured soil respiration. Fri. 7/6/01. Arrived at Tonzi Ranch 2:20 am Standard Time. -Measured leaf water potentials 2:34-3:53 am Standard Time. Sky still dark by finish time. -Measured LAI of transect T3. Full moon. -Sunrise ~6:30 am. -Installed dendrometer bands on trees 71 and 78. -9:20-10:30 Standard Time. Interrupted CR10X of Set Q (by understory tower) to check status of sapflow sensors. Tree 255: lower sensor's constantan wire seems to have lost long lead connection. Connections between copper wires still continuous, so break in the constantan is most likely at the soldered connection between the short and long lead. Trees 248, 252: heaters are out. -12:00-13:00 Standard Time. Installed dendrometer bands on remaining Set Q trees 245, 248 and 255. Tightened dendrometer to Tree 250. -13:49-15:31 Standard Time. Measured mid-day leaf water potentials. Comments: Set P trees definitely have better pre-dawn water status than Set Q trees (Set P, -24 +- 2 bar; Set Q, -32+=1 bar). At mid-day, the two sets of trees converge to about -34 bar, with much more variability for Set Q (+-7 bar) than for Set P (+-2 bar). See plot in New Amador:\Sites\Tonzi_OakSavanna\LeafWaterPotential\LeafH2OSummaries.xls. |
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) | ||
|---|---|---|---|---|---|
| 2001-07-06 06:00:00 | OAK | SETP | -23.9 | 1.59 | 8 |
| 2001-07-06 06:00:00 | OAK | SETQ | -32.2 | 0.77 | 6 |
| 2001-07-06 06:00:00 | PINE | 78 | -21.5 | 2.12 | 3 |
| 2001-07-06 12:00:00 | OAK | SETP | -33.1 | 2.25 | 8 |
| 2001-07-06 12:00:00 | OAK | SETQ | -34.4 | 6.77 | 6 |
| 2001-07-06 12:00:00 | PINE | 78 | -23.5 | 2.12 | 3 |
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