Field Notes

<--2025-02-21 10:50:00 |
Other sites visited today: Vaira
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Tonzi: 2025-03-11 10:45:00 (DOY 70)
Author: Joe Verfaillie
Others: Kuno

Summary: Standard data collection, Kuno added twig flux, Installed FD from Vaira at tree1 and move FD back to open, garter snake, pulled Under moisture point probe.

Tonzi
2025-03-11

Kuno and I arrived at about 11:45 PDT - first visit since the return to daylight savings. It was clear, sunny and warm. The trees have started to put on leaves - the mutant next to Tonzi's house is almost fully leafed out. More cold and wet weather is due to start tomorrow though. At the site we met a cowboy on horseback that was out looking for the cows to see if they were well. He said there is about 100 head on the land. Still big puddles on the road by the tower. Rob left some big ruts in the ground to the west of the soil CO2 fence where they were pulling logs out from a downed pine over near trees 72 and 79.

I climbed the tower and did the tower top stuff. The wash reservoir was nearly full - I topped it up. I tried to update the phenocam scripts remotely yesterday but had a DNS problem (I think).
The 7500 read: 436.4ppm CO2, 305.3mmol/m3 H2O, 16.0C, 98.3kPa, 100.2SS
The 770o read: 2.08ppm CH4, 62.3RSSI - 86.4 after cleaning
I cleaned the radiometers.

At the Floor Kuno did his usual rounds of trunk and soil fluxes. This time he added some twig ends and clipped them hoping to get surface area. The wash reservoir here was nearly full too and topped off. I collected the well and three tree bole temps.
The 7500 read: 431.9ppm CO2, 304.5mmol/m3 H2O, 18.4C, 98.6kPa, 103.1SS
The 7700 read: 2.07ppm CH4, 61.5RSSI - 76.2 after cleaning
I should bring some nail polish to touch up the 7700 spars. The optics RH has been stable at 12%.

I did the manual moisture point readings. I pulled the Under probe sn 000000402165 because it has crushed and broken pins. I read the manual dendrometers - one might have been pulled on by cows. I collected the FD data. Last time I moved the open FD sn FD20190027 to the tree1 location because that FD died. This time I put it back in the open location and swapped in the FD from Vaira sn FD20180026 under the tree.

Found a large (3ft) northwestern garter snake near the Floor site.

I serviced the zcams, measured the wells and collected the Road Well data.

The cows had messed up the fence around the Tower again. I straightened it out and added another fence post in the southeast corner. I also braced both of the southern corners with diagonal posts. I found another old litter basket in that area and pulled it out. I also brought a dead battery in from west of the Soil CO2 fence - there are still a couple of broken boardwalks over there.

The Floor met box door was ajar when we got there I closed and fastened it.

We left at about 15:30 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2025-03-11	VR_well	54.4
2025-03-11	TZ_floor	26
2025-03-11	TZ_road	34.15
2025-03-11	TZ_tower	29.6

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)
2025-03-11	1	14.1
2025-03-11	102	7.9
2025-03-11	2	18.0
2025-03-11	245	13.0
2025-03-11	3	11.4
2025-03-11	4	9.1
2025-03-11	5	6.4
2025-03-11	6	10.1
2025-03-11	7	17.6
2025-03-11	72	4.3
2025-03-11	79	11.7