Field Notes

<--2012-09-06 05:30:00 | 2012-09-19 05:30:00-->
Other sites visited today: Vaira | Tonzi

Tonzi: 2012-09-19 05:15:00 (DOY 263)
Author: Joe Verfaillie
Others: Siyan

Summary: Pre-dawn water potential, reinstall LI-800 and restart co2 profile system, swapped z-cam power supplies.

Tonzi
2012-09-19

I arrived about 5:15 with Siyan for pre-dawn water potential. It was clear, cool and still with lots of stars in the sky. The day was mild (I wore a jacket until 9am) with a little bit of breeze picking up midday. The tree look not so brown this week, I think a lot of the brown leave have fallen off the trees and the green leaves have remained. We saw Mr Tonzi on the way out.

We went to Vaira around 7am and returned about 8am.

I reinstalled the Li-800 in the CO2 profile system. The data logger had lost its time. I reset its clock and reloaded the program. It seemed to be running okay and Siyan calibrated it. I removed the filter from the filter holder inside the box hoping this would increase and smooth out the flow. The flow might be a little smoother but did not increase much. There are still filters on each of the inlets.

The internal battery of the CR10X that runs the CO2 profile is dead and needs replacing. The batteries on the tower met CR23X (2.5202V) and the Soil CO2 CR23X (2.5587V) are also low. The OS on the Theta Probe CR23X (v0006) and Soil Temperature CR10X (v0009) are really old and could be upgraded.

I swapped power supplies on the z-cams. The new power supplies are more efficient and much smaller.

I cleaned the window on the WindCube lidar profiler.

I collected some old litter pans near the Floor tower for disposal.

Looks like the USC folks were here again. They left some tools, but I didn’t notice any new installations.

The fans on both computers seem to be failing and need to be replaced.

Siyan did water potential, the standard fieldwork and collected data.

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2012-09-19	TZ_floor	28.6
2012-09-19	TZ_road	35
2012-09-19	TZ_tower	34

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)
2012-09-19	1	21.6
2012-09-19	102	13.9
2012-09-19	2	14.5
2012-09-19	245	10.1
2012-09-19	3	18.1
2012-09-19	4	3.1
2012-09-19	5	24
2012-09-19	7	19.1
2012-09-19	72	10.8
2012-09-19	79	10.3
2012-09-19	8	6.9

Water Potential - mode: raw

Time< h>	Species	Tree	readings (bar)
2012-09-19 05:20:00	OAK	UNKNOWN	-49	-51.5	-44	-53	-55	-55	-27.5	-28	-26.5
2012-09-19 05:20:00	PINE	UNKNOWN	-25	-15	-20	-25	-25	-13
2012-09-19 10:14:00	OAK	UNKNOWN	-55.5	-42	-48	-38	-40	-49	-37	-37
2012-09-19 10:14:00	PINE	UNKNOWN	-17	-12	-15	-22	-21