Field Notes

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Other sites visited today: Vaira
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Tonzi: 2024-09-10 10:30:00 (DOY 254)
Author: Joe Verfaillie
Others: Kuno, Gerardo

Summary: Standard fieldwork, Kuno adding/measuring more stem/ground fluxes, JPL stuff removed, Trees a bit yellow/brown

Tonzi
2024-09-10

Kuno and I arrived at about 11:30 PDT. It was mild and dry. Many of the trees were tinged with yellow and brown. Gerardo from JPL had arrived earlier and was just beginning to remove their equipment. He removed everything except the solar panels and power line to the tower. He said we are welcome to use them.

Kuno is expanding his stem/trunk chamber measurements and soil fluxes. In total, 30 chambers were installed for five trees. Each tree has two chambers per height and installation heights were 0.4m, 1.3m, and 2.7m. In addition to CO2, CH4 and N2O flux measurements, bark temperature and moisture was measured and tree diameter at breast height. One soil GHG flux sampling collar for smart chamber was installed proximity to each tree with stem chambers. Close to each collar, soil moisture, temperature and conductivity was measured, and soil samples were collected for C and N analyses.

Soil CO2, CH4 and N2O fluxes were very small (< 1 nmol m-2 s-1). However, all soil collars were very small CH4 sinks. Most of the trees were CO2 and N2O (negligible) sources while being small CH4 sinks.

Next time: installing 6 additional chambers plus relocating some of the soil collars from first campaign, so in total we have 10 soil ghg sampling spots.

I did the standard fieldwork. I measured the Moisture Points, well level and read the dendrometers. I collected the Floor fluxes and the Floor and Road well data and the FD data. I collected the Tower flux, met and camera data late in the day. I did midday water potential and serviced the z-cams. I was prepared to redo the windows on z-cam 2 and 3, but I could not push the glass off the box lid with my fingers so assumed they are still water tight. Some of the edges of the silicon are loose but seems there is still enough between the glass and box lid for a tight seal.
The Floor read: 425.8 ppm CO2, 553.7mmol/m3 H2O, 27.4C, 98.6kPa, 96.9SS
The Tower read: 409.3ppm CO2, 499.6mmol/m3 H2O, 28.1C, 98.3kPa, 945SS

I went to Vaira about 14:30 PDT and returned at about 15:30 PDT the finish up and wait for Kuno to finish the chamber work.

We left at about 17:30 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2024-09-10	TZ_floor	26.4
2024-09-10	TZ_road	35.55
2024-09-10	TZ_tower	31
2024-09-10	VR_well	58.05
2024-09-10	VR_pond	14.04

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)
2024-09-10	1	8.2
2024-09-10	102	4.1
2024-09-10	2	17.1
2024-09-10	245	10.9
2024-09-10	3	9.3
2024-09-10	4	11.5
2024-09-10	5	21.2
2024-09-10	6	9.0
2024-09-10	7	16.7
2024-09-10	72	10.3
2024-09-10	79	9.9