Field Notes

<--2020-06-12 10:30:00 | 2020-07-07 10:00:00-->
Other sites visited today: Vaira | Tonzi

Tonzi: 2020-06-12 12:00:00 (DOY 164)
Author: Joe Verfaillie
Others: Hisashi, Kyoko, Siyan

Summary: Grass is mostly dead, fire to the northeast, replaced z-cam clock batteries and reset clocks, tree circumference for DBH trees

Tonzi
2020-06-12

Hisashi, Kyoko, Siyan and I arrive at 12:00. It was a mild day with a strong gusty wind from the east southeast. We could see a fire burning to the northeast and three firefighting aircraft flew over. The fire was near Grant Line Road and Kiefer Boulevard and was 5000+ acres. The trees look good but the grass is near completely dead. The pond is about half full and no cows were seen. On the way home we got into a bit of rain near Davis.

I checked on the LattePanda computer and it seems fine with the external USB hub. I brought a powered USB hub just in case but adding more components to the system doesnâ€™t seem warranted at this time.

I collected the eddy data, the FD chamber data (did not clear it), and the data loggers not connected by radio. The CR1000 tree IRT had not sent data since last visit. I downloaded it directly. It probably needs an antenna extension to get the antenna away from the metal box.

The Tower 7500 read: 406.8ppm CO2, 470.4mmol/m3 H2O, 21.5C, 99.4kPa, 99.1SS
The Floor 7500 read: 410.3ppm CO2, 435.0mmol/m3 H2O, 24.5V, 99.2kPa, 99.1SS

Siyan did DBH, well measurements and midday water potential.

I serviced the z-cams. Cam 1â€™s clock battery had died last time. I replaced the old battery which still had a voltage of 3.08V with a new one and set its clock to PST. I replaced the batteries in the other two cameras just in case:
Cam 2: battery was 3.06V, its clock was set to PDT, I reset it to PST
Cam 3: battery was 3.07V, its clock was set to PDT, I reset it to PST

I also measured the circumference of the DBH trees in cm by putting a tape around them just above the DBH band. On a larger tree a difference of more than 1cm could occur depending on how I placed the band. Also on trees larger than 100cm I had to measure the circumference in two parts.
Tree, circumference (cm)
245, 54
102, 83
79, 107.5
72, 106
1, 107.8
7, 89.5
4, 80
5, 41.7
6, 53
2, 125.5
3, 111

We left at about 14:30

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2020-06-12	VR_well	55.3
2020-06-12	TZ_floor	27
2020-06-12	TZ_tower	31.6
2020-06-12	TZ_road	36
2020-06-12	VR_pond	17.56

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower [1] => Floor_South [2] => Soil_Transect_4 [3] => Soil_Transect_3 [4] => Soil_Transect_2 [5] => Soil_Transect_1 [6] => SoilCO2_West_A [7] => SoilCO2_West_B [8] => SoilCO2_West_C )

Date	DOY	Rep	Depth	Tower	Floor_South	Soil_Transect_4	Soil_Transect_3	Soil_Transect_2	Soil_Transect_1	SoilCO2_West_A	SoilCO2_West_B	SoilCO2_West_C	Avg	Spacial Count	Measurement Count
2020-06-12	164	0	0-15cm	5.3	6.6	2.4	9.4	3.7	0.3	9.7	5.9	4.7
2020-06-12	164	0	15-30cm	11.2	11.8	9	15.8	21.9	5.1	14.8	6	13.6
2020-06-12	164	0	30-45cm	15.6	15.4	11.5	16.5	29.3	14.1	20.1	17	12.6
2020-06-12	164	0	45-60cm	20.2	7.3	12.5	21.6	27.4		17	23.4	20.5
2020-06-12	164	1	0-15cm	5.3	1.5	2.1	8.8	1.9	0.3	8.3	5.3	5
2020-06-12	164	1	15-30cm	12.1	11.2	9	15.5	19.1	4.8	12.4	4.5	13
2020-06-12	164	1	30-45cm	15.6	16.5	10.6	16.5	25.4	14.3	20.1	15.6	12.6
2020-06-12	164	1	45-60cm	19.9	7.3	13	21.9	27.6		17.6	23.4	19.6
2020-06-12	164	Avg	0-15cm	5.3	4.05	2.25	9.1	2.8	0.3	9	5.6	4.85	4.81	9	18
2020-06-12	164	Avg	15-30cm	11.65	11.5	9	15.65	20.5	4.95	13.6	5.25	13.3	11.71	9	18
2020-06-12	164	Avg	30-45cm	15.6	15.95	11.05	16.5	27.35	14.2	20.1	16.3	12.6	16.63	9	18
2020-06-12	164	Avg	45-60cm	20.05	7.3	12.75	21.75	27.5		17.3	23.4	20.05	18.76	8	16

mode = both
Moisture Point Probes VR
Array ( [0] => Flux_Tower [1] => Biomass_Cage )

Date	DOY	Rep	Depth	Flux_Tower	Biomass_Cage	Avg	Spacial Count	Measurement Count
2020-06-12	164	0	0-15cm	1.2	0.6
2020-06-12	164	0	15-30cm	9.3	5.7
2020-06-12	164	0	30-45cm	4.5	13.4
2020-06-12	164	0	45-60cm	14.8	15.6
2020-06-12	164	1	0-15cm	1.5	0.6
2020-06-12	164	1	15-30cm	9.3	5.7
2020-06-12	164	1	30-45cm	3.7	13.1
2020-06-12	164	1	45-60cm	13.9	15.3
2020-06-12	164	2	0-15cm	1.2	0.3
2020-06-12	164	2	15-30cm	9.7	6
2020-06-12	164	2	30-45cm	3.9	14
2020-06-12	164	2	45-60cm	14.2	15
2020-06-12	164	3	0-15cm	1.2	1.2
2020-06-12	164	3	15-30cm	9	5.7
2020-06-12	164	3	30-45cm	4.5	14
2020-06-12	164	3	45-60cm	13.6	15.6
2020-06-12	164	Avg	0-15cm	1.28	0.68	0.98	2	8
2020-06-12	164	Avg	15-30cm	9.33	5.78	7.56	2	8
2020-06-12	164	Avg	30-45cm	4.15	13.63	8.89	2	8
2020-06-12	164	Avg	45-60cm	14.13	15.38	14.76	2	8

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2020-06-12	1	25.2
2020-06-12	102	16.3
2020-06-12	2	23.0
2020-06-12	245	12.6
2020-06-12	3	15.4
2020-06-12	4	9.0
2020-06-12	6	16.0
2020-06-12	7	19.2
2020-06-12	72	9.4
2020-06-12	79	20.6

Water Potential - mode: raw

Time	Species	Tree	readings (bar)
2020-06-12 13:13:00	OAK	102	-23	-17	-27
2020-06-12 13:13:00	OAK	35	-35	-34	-36
2020-06-12 13:13:00	OAK	92	-31	-27	-26
2020-06-12 13:49:00	PINE	OLD	-1	-5	-4
2020-06-12 13:49:00	PINE	YNG	-1	-5	-7