When: Date: 5/1/2007 , Day: 121 , Watch Time: 10:00am .
Where: Tonzi/Vaira Ranch
Who: Siyan
Weather: half clear, half cloudy. Mr. Tonzi said if he saw goosy cloud, it supposed to rain in next days.
Phenology: Varia grass starts turning to yellow (~10%). Clovers dominated the understory layer of the grassland and showed purple follows. Tonzi grass was still green with heading. Herbs showed yellow flowers all over the ground. Talked with Mr. Tonzi. He recalled that 1932, 1948, and 1949 were extremely cold years. Acorns depend on April temperature. If temperature is less than 15 -17^oC during April, maybe there are no acorns that year. The year of 1955 had flooding in the area. This information is good to check with historic climate data.

Summary

1. Swapped Li-7500 on Tower and Floor sites.
2. Checked and downloaded data at Tower, Floor, and Vaira. All is well.
3. Soil CO2 profile system still works with the sensor’s measurable range. This is a dry spring.
4. Collected grass sample for LAI and phenology in Tower and Vaira, oak branches for N.
5. Measured soil moisture at Vaira and Tonzi
6. Read dendrometer

Vaira_Grass Site

1. Fence and gate power: >12 v.
2. Panel and Batteries: 13.8 v; 12.4 amps; 2.9 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\V07_ 121 .flx D:\Data\VR07 .raw
	mean	std		mean	std
w	0.06	0.273	Ts	16.93	0.309
u	-1.23	0.820	H2O	1.52	0.124
v	0.04	0.309	CO2	1.74	0.04
			Tc	1.57	0.042

1. downloading data
2. check the fans of air temp. and relative humidity sensors at Vaira. Good!
3. Check MD-9 system connections. OK!
4. Check levels of Radiation sensors, clear up surfaces. Yes. Slight bird crap on 4-way sensors.

9. Closed gate and set up fence. Yes.

Tonzi_Tower Site

1. Fence and gate power: 12 v.
2. Panel and Batteries: 14.1 v; 0.0 amps; 5.0 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\T07_ 121 .flx D:\Data\TW07 .raw
	mean	std		mean	std
w	-0.33	0.504	Ts	19.24	0.950
u	-1.89	0.821	H2O	1.401	0.174
v	-0.99	0.471	CO2	1.777	0.036

1. downloading data. Yes.
2. swaping Li-7500 Analyzer. (Remove SN# 41 ; install SN# 976 )
3. check the fans of air temp. and relative humidity sensors on the tower and the floor. OK!
4. Check calibration cylinders;

CO₂ 1300 psig; flow 20 psi.
N₂ 1000 psig; flow 20 psi.
Manually calibrate Li-800. Following Ted’s instruction: H:\IoneSavanna_2004\Tower_2004\CO2Profile\LI800_Calibration_Procedure_2Nov04.txt
Is the pump running‌ OK.
How to check the CO2 values‌ Click “Ports/Flags” button to see which ports or flags is setting high. Pressure should be less than ambient value. When Flag 8 is high, it may indicate that RRR’s battery is low. Ok.
Readings of CO2 profile system:

21.5				-1.2
12.03				939
374	380	383	385	44.9
938	936	930	931	49.3
945	945	945	945	423.7
949	959	949	950	939
				44
				49

1. close gate and set up fence.

Toniz_Floor Site

1. Fence and gate power: 12 v.
2. Panel and Batteries: 13.7 v; 8.2 amps; 1.7 amps.
3. Reading from Gillsonic screen before downloading data. (The value of H₂O and CO₂ should be in the range of 0 – 5 v.)

Time
Path/File name	D:\Data\F07_ 121 .flx D:\Data\FL07 .raw
	mean	std		mean	std
w	0.15	0.21	Ts	21.2	1.64
u	0.07	0.28	H2O	2.4	0.11
v	0.06	0.73	CO2	1.7	0.02

1. downloading data
2. swaping Li-7500 Analyzer. (Remove SN# 418 ; install SN# 73 )
3. Check MD-9 system connections OK!
4. Soil CO₂ profile

Reading from panels of analyzers

depth	Open	order	depth	Tree	order
2cm (1%)	1650	1	2cm (1%)	1840	1
4cm	2470	2	4cm	8040	4
8cm	4390	3	8cm	3530	2
16cm	6160	4	16cm	0.76%	3

1. Close gate and set up fence.

tonzi	7931AFE	402165	574B4B	402FF3	574632	7A432E	7A3C6E	7A3B40	7A4AAA
1-May-07	121
	SM
0-15	15.0	13.0	25.8	13.8	7.3	18.2	17.6	14.1	8.8
15-30	22.2	23.4	28.8	25.5	19.1	15.5	23.7	23.4	7.5
30-45	27.6	24.8	37.4	33.2	28.3	19.3	21.5	26.5	22.1
45-60	30.8	21.6	49.8	44.3	41.4	23.4	29.1	38.8	16.5
	A6D882B	A3D04E8	A6D72F5
0-15	25.8	#DIV/0!	9.4
15-30	19.7	#DIV/0!	23.4
30-45	29.6	#DIV/0!	25.7
45-60	36.5	#DIV/0!	31.9
vaira	57318a	7933dee
0-15	3.6	6.8
15-30	9.1	14.9
30-45	14.0	16.7
45-60	16.9	21.7

Tonzi
Dendrometer
Date	Day	Tag #	Reading (cm)
5/1/2007	121	71	-
		72	-
		77	Broken
		78	Broken
		79	-
		245	22.7
		248	24.8 (out of range)
		250	22.9
		255	21.5
		‌252‌	missing
		102	Broken