Field Notes

<--2022-03-24 12:30:00 | 2022-04-27 11:00:00-->
Other sites visited today: Vaira

Tonzi: 2022-04-12 11:00:00 (DOY 102)
Author: Joe Verfaillie
Others: Keenan Lab

Summary: Keenan lab doing SIF, Removed calkit from Tower, cleaned up old wires on Tower, Removed Tree 1 FD chamber, Midday water potential, re-glued Phenocam window

Tonzi
2022-04-12

I arrived at about 11:00PDT. The Keenan lab (Sophie, Nicola, Trevor, Tyler, Ann) had arrived earlier and were setting up to take SIF images of a patch of grass west of the soil co2 fence and east of LiuKang’s tree. There was a bit of rain yesterday but the ground was still mostly dry except for some small puddles in the road. The grass is turning yellow in spots. The trees are fully leafed out but a few have leaves that look slightly stunted – frost, disease, insects? There are lots of yellow dandelions blooming.

I checked in with Sophie but they seemed to have everything they needed so I began work at the Tower. I removed the CalKit from the top of the Tower – the following equipment came off:
CR1000 sn 23865
CNR4 sn 120788
PAR sn 212225
NDVI in sn 1049
NDVI out sn 1050
HMP155 sn T2930114

I also cleaned up the Tower some more removing some baling wire from the SMAP equipment. Two cables had half fallen out of the big plastic conduit on the southwest corner of the tower. I coiled them up where they came out of the conduit. I also removed two serial lines, MD9 coax cable, an ethernet line, and one or two more unused cables that had run up the northwest corner. The Ethernet line had a break in it close to the top where it had been bent sharply. I also re-glued the Phenocam window.

The Tower 7500 read: 419.5ppm CO2, 230.5mmol/m3 H2O, 99.6kPa, 10.2C, 104.1SS
The Floor 7500 read: 423.7ppm CO2, 222.5mmol/m3 H2O, 99.7kPa, 14.5C, 101.6SS

I measured the soil moister and well depths, read the dendrometers, and serviced the zcams.

The IRT sensors near the Floor solar panels had been disturbed by the cows. The one that usually points at the grass was pointed at the sky. The two point at the tree trunk were pointing elsewhere and at least one of their cables was chewed. I realigned them but I think I will move these to all point at the cal panel next time and then remove them – maybe Carlos wants to use them.

At midday I did leaf water potential. Twigs from three trees were all about -10 Bar. One twig didn’t produce any water even at more than 20 Bar – I decided something was wrong with that twig.

The Tree1 FD chamber sn FD20180048 had been reading the same CO2 for both chambers (zero flux) and I thought its solenoid was bad. But when I went to remove it, it was laying on its side, so both chambers were exposed to the air. I removed it anyway thinking that I would have noticed that it was on its side last time. In the lab it seems okay but I’ll need to set up a fancier test to really see if both chambers are okay.

I was also thinking about swapping out the solar charger controller there but it will be a bit of work. That whole system needs to be mostly removed and a few things integrated with the OSU system there. Another time.

I left at about 15:50 for Vaira just after the Keenan lab had headed home.

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2022-04-12	TZ_floor	25.15
2022-04-12	TZ_road	33.5
2022-04-12	TZ_tower	28.8
2022-04-12	VR_well	53.95

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] => SoilCO2_West_A [6] => SoilCO2_West_B [7] => SoilCO2_West_C [8] => Soil_Transect_1 )

Date	DOY	Rep	Depth	Tower	Floor_South	Soil_Transect_4	Soil_Transect_3	Soil_Transect_2	SoilCO2_West_A	SoilCO2_West_B	SoilCO2_West_C	Soil_Transect_1	Avg	Spacial Count	Measurement Count
2022-04-12	102	0	0-15cm	13.2	8.1	14.1	13.8	10.9	19.1	13.5	8.3
2022-04-12	102	0	15-30cm	17		4.8	16.4	18.2	12.7	6.3	14.2
2022-04-12	102	0	30-45cm	20.7	20.9	12	15.9	23.5	20.1	21.5	14.8	19
2022-04-12	102	0	45-60cm	28.8	25.4	15.3	19.3	38.8	25.1	15.6	18.5	19.6
2022-04-12	102	1	0-15cm	13.8	10.6	14.4	13.2	10.6	19.4	13.2	7.4	5
2022-04-12	102	1	15-30cm	16.7	12.4	7.5	16.4	17.5	13.3	6.3	14.2	9
2022-04-12	102	1	30-45cm	19.8	21.5	13.4	16.5	23.5	20.4	20.9	14.3	19.3
2022-04-12	102	1	45-60cm	28.8	25.2	15.6	19.9	39.1	24.8	14.8	17.9	19.6
2022-04-12	102	2	0-15cm									5
2022-04-12	102	2	15-30cm									9.3
2022-04-12	102	2	30-45cm									19.3
2022-04-12	102	2	45-60cm									19.3
2022-04-12	102	Avg	0-15cm	13.5	9.35	14.25	13.5	10.75	19.25	13.35	7.85	5	11.87	9	18
2022-04-12	102	Avg	15-30cm	16.85	12.4	6.15	16.4	17.85	13	6.3	14.2	9.15	12.48	9	17
2022-04-12	102	Avg	30-45cm	20.25	21.2	12.7	16.2	23.5	20.25	21.2	14.55	19.2	18.78	9	19
2022-04-12	102	Avg	45-60cm	28.8	25.3	15.45	19.6	38.95	24.95	15.2	18.2	19.5	22.88	9	19

No VR Moisture Point data found

No TZ grass heigth found

Grass Height VR 14

Date	Height reps (cm)														Location	Average	Samp	STDEV
2022-04-12	10	14	25	26	14	40	14	40	10	26	7	20	30	40	GH_ALL	22.57	14	11.28

Tree DBH

Date	Tag#	Reading (mm)
2022-04-12	1	19.9
2022-04-12	102	15.8
2022-04-12	2	17.1
2022-04-12	245	4.6
2022-04-12	3	20.4
2022-04-12	4	17.0
2022-04-12	5	9.9
2022-04-12	6	20.4
2022-04-12	7	10.5
2022-04-12	72	13.9
2022-04-12	79	13.1