Field Notes

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Other sites visited today: Gilbert Tract | Vaira
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Tonzi: 2024-03-07 13:10:00 (DOY 67)
Author: Joe Verfaillie
Others: Daphne, Ngoc

Summary: Added solar panels to Hise ptden, added for new TOMST ptden, Fixed cable on SHF plate, did regular data collection

Tonzi
2024-03-07

Daphne, Ngoc and I arrived at about 13:10. This is mostly a maintenance trip but we are also collecting all the data to reduce the work load next week. It was mostly sunny and cool with just a few clouds fleeing to the east. The ground is still very wet. I saw a few wild flowers but no signs of the trees beginning to put on leaves.

Daphne did most of the regular data collection and Ngoc helped with the soil moisture and wells. Zcam1 was tilted (but I didn’t notice the images being tilted) and its clock reset. Needs a new clock battery next time.
The Tower read: 427.2ppm CO2, 456.5mmol/m3 H2O, 16.7C, 98.9kPa, 99.7SS
The Floor read: 434.0ppm CO2, 471.4mmol/m3 H2O, 16.6C, 99.1kPa, 99.5SS

I added old Arable solar panels to the Hise point dendrometers 2-5. They all had charging LEDs lit.

Then I worked on adding new TOMST dendrometers to other trees. It was hard to figure out how much bark to shave off. A big pine had really thick bark and I think I went too deep on oak 102. I put on four of the seven TOMST dendrometers. I’ll see how these go and decide what to do with the rest. I put up
Cluster tree 5:
TOMST sn 92243045, DBH = 13.75cm
Water Potential Tree 102:
TOMST sn 92243043, DBH = 27.36cm
Mature Pine 11833 near Cluster Tree 7:
TOMST sn 92243042, DBH = 59.91cm – This tree is at an angle, the DBH I measured was horizontal so more of an ellipse.
Liukang’s Tree – ancient Oak water potential Tree 92:
TOMST sn 92243044, DBH = 74.96cm

I also measured a couple of pines that show up in the leaf water potential data:
Yng Pine = 9.87cm
Old Pine = 70.35cm – this pine has a huge indented scar on its south side
Tree to the NW of 245 is tree 129

The cow fence around the main tower was working so I did not swap its battery. I should still probably redo the connections and seal them. The cow fence around the soil co2 site was broken and the Tree1 FD was on its side. Daphne fixed the FD chamber and I fixed the fence. I added a strand of barbed wire to the fence around the Floor solar panels.

Daphne worked on replacing the cable of SHF plate 1 sn 000138. The insulation was all rotten. The plate was 2-5cm below the surface – it was tilted and ground surface was not very flat. We put it back at 3cm and the new cable in conduit. I move SHF plate 4 sn 00068 back to -10cm like I found it a couple weeks ago.

We left at around 16:30

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2024-03-07	VR_well	53.6
2024-03-07	TZ_floor	22.8
2024-03-07	TZ_road	30.67
2024-03-07	TZ_tower	26

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)
2024-03-07	1	20.6
2024-03-07	102	10.8
2024-03-07	2	16.2
2024-03-07	245	10.5
2024-03-07	3	7.4
2024-03-07	4	9.3
2024-03-07	5	18.0
2024-03-07	6	7.9
2024-03-07	7	15.8
2024-03-07	72	6.8
2024-03-07	79	7.1