Field Notes

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Tonzi: 2023-04-14 14:00:00 (DOY 104)
Author: Joe Verfaillie
Others: Daphne

Summary: The trees are about half way through leaf on, soil cores for Ameriflux, Tower IRGA had problems - swapped, connection problems with Floor 23x but got data, Steers on the land this spring.

Tonzi
2023-04-14

Daphne and I arrived at about 14:00 PDT. It was clear, sunny and green – the trees have put on leaves but still some are not fully leafed out – maybe about half way. I noticed a few dead trees and more seem to have a lot of dead branches and few leaves. Maybe they will still fill in more. The ground has dried up very fast. Last time there was standing water everywhere and today the road was dry and the puddles were all but gone. We met Rob on his 4-wheeler. He remarked on how fast it dried out too. He also said that many trees had fallen on his fence line and that the price for fencing has doubled. The cows on the land this spring are all steers. A little research: steers are male cows castrated very young – they are heavier (more profitable) than female cows (heifers) and apparently than bulls that may be castrated later.

I dug four pits for soil cores for the Ameriflux project. The pits were near the Tower soil sensors, the Floor Moisture Point sensor, the soil co2 soil sensors and to the west of the Tower. The two pits near the Tower had heavy wet clay in the bottoms. The other two pit may have heavy clay in the bottoms too but it was already dryer and hard to dig in. The required 0 and 10cm samples were easy but the deepest sample that was supposed to be at >50cm ended up 30 to 40cm deep.

Daphne did the soil moisture, DBH, well measurements and serviced the z-cams. She also collected the Floor data and FD data. She set the Floor eddy clock +45sec
The Floor read: 419.3ppm CO2, 345.0mmol/m3 H2O, 18.7C, 99.0kPa, 98.9SS

The tower IRGA has had zero signal strength. I saw this last time but though it might have been water on the windows and had good numbers after cleaning and inspecting it. This time I swapped out the IRGA: sn 1594 came off and sn 75H-2667 went on. I updated the pressure coefficients and reset the box.
2667 read: 419.4ppm CO2, 333.6mmol/m3 H2O, 18.3C, 98.9kPa, 102.9SS

We couldn’t connect to the fmet 23x from the tower. I’m not sure why. The 23x was running and I collected all its data directly with the lap top.

We left at about 17:30 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2023-04-14	VR_well	46.7
2023-04-14	TZ_floor	15.4
2023-04-14	TZ_tower	18.15
2023-04-14	TZ_road	23.87

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)
2023-04-14	1	12.3
2023-04-14	102	4.3
2023-04-14	2	4.6
2023-04-14	245	6.5
2023-04-14	3	4.8
2023-04-14	4	7.0
2023-04-14	5	12.5
2023-04-14	6	5.6
2023-04-14	7	13.5
2023-04-14	72	17.1
2023-04-14	79	19.4