Field Notes

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Other sites visited today: Vaira

Tonzi: 2021-09-01 12:00:00 (DOY 244)
Author: Joe Verfaillie
Others:

Summary: Swapped 7500s, swapped FD chamber in open location, add power pack back to road well, z-cam cards in wrong cameras but okay, midday water potential

Tonzi
2021-09-01

I arrived at about 12:00 PDT. It was clear sunny and warm with a nice cool breeze from the west. I could see the smoke plume from the Caldor fire near Tahoe on the horizon but I think the breeze kept the smoke away. There is still a little bit of water in the pond. The trees are looking brown again but about the right time of year for that.

I swapped 7500s for calibration. At the tower sn 0035 came off and sn 75H-2514 went on. At the Floor sn 0418 came off and sn 75H-2669 went on. I uploaded the new config files, updated the pressure coefficients and reset the 7550 boxes.
Tower 0035 read: 399.1ppm CO2, 458.8mmol/m3 H2O, 98.4kPa, 23.3C, 97.2SS
Tower 2514 read: 409.0ppm CO2, 417.2mmol/m3 H2O, 98.3kPa, 22.9C, 102.0SS
Floor 0418 read: 406.6ppm CO2, 482.2mmol/m3 H2O, 98.5kPa, 26.3C, 97.2SS
Floor 2669 read: 409.4ppm CO2, 444.9mmol/m3 H2O, 98.5kPa, 26.3C, 101.1SS

I collected flux, met and camera data. I measured the wells, soil moisture and DBH gauges. I did midday water potential. Itâ€™s getting hard to find twigs with all green leaves. Pressures are more negative and one tree maxed out the tank I have â€“ probably last measurement for the year.

I swapped the open FD chamber sn FD20180026 came off and sn FD20190027 went on. The existing chamber failed two performance checks with different concentration from the two samples.

I put a lithium power pack back on the road well. All seemed well.

I serviced the z-cams. The memory cards for cam 1 and cam 2 were swapped but seemed to work fine. I was careful to put them away correctly. The window on z-cam one has come loose. I put it back in place and it should be okay since itâ€™s not likely to rain soon but needs to be re-glued.

I left at about 15:30 PDT.

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-09-01	VR_well	60
2021-09-01	VR_pond	12.88
2021-09-01	TZ_floor	32
2021-09-01	TZ_road	39.7
2021-09-01	TZ_tower	36.7

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower [1] => Soil_Transect_4 [2] => Soil_Transect_3 [3] => Soil_Transect_2 [4] => Soil_Transect_1 [5] => SoilCO2_West_A [6] => SoilCO2_West_B [7] => SoilCO2_West_C )

Date	DOY	Rep	Depth	Tower	Soil_Transect_4	Soil_Transect_3	Soil_Transect_2	Soil_Transect_1	SoilCO2_West_A	SoilCO2_West_B	SoilCO2_West_C	Avg	Spacial Count	Measurement Count
2021-09-01	244	0	0-15cm	2.1	4.6	0.1	2.4	1.2	7.1	3	3.3
2021-09-01	244	0	15-30cm	10.6	4.2	12.7	11.5	3.2	5.7	1.4	11.2
2021-09-01	244	0	30-45cm	13.4	9.5	12.3	15.4	12.6	14.8	14	10.9
2021-09-01	244	0	45-60cm	18.8	10.2	19.9	25.9	13	15.9	7.9	11.6
2021-09-01	244	1	0-15cm	2.7	6.6	0.1	2.1	1.8	6.5	3.6	2.7
2021-09-01	244	1	15-30cm	11.2	6.3	12.1	10.6	3.2	5.7	1.7	11.2
2021-09-01	244	1	30-45cm	14	9.2	10.6	15.9	12.9	14.5	13.7	10.3
2021-09-01	244	1	45-60cm	18.2	10.5	20.2	26.5	12.8	15.6	9.9	11.3
2021-09-01	244	Avg	0-15cm	2.4	5.6	0.1	2.25	1.5	6.8	3.3	3	3.12	8	16
2021-09-01	244	Avg	15-30cm	10.9	5.25	12.4	11.05	3.2	5.7	1.55	11.2	7.66	8	16
2021-09-01	244	Avg	30-45cm	13.7	9.35	11.45	15.65	12.75	14.65	13.85	10.6	12.75	8	16
2021-09-01	244	Avg	45-60cm	18.5	10.35	20.05	26.2	12.9	15.75	8.9	11.45	15.51	8	16

mode = both
Moisture Point Probes VR
Array ( [0] => Flux_Tower [1] => Biomass_Cage )

Date	DOY	Rep	Depth	Flux_Tower	Biomass_Cage	Avg	Spacial Count	Measurement Count
2021-09-01	244	0	0-15cm	0.1	1
2021-09-01	244	0	15-30cm	6	3.2
2021-09-01	244	0	30-45cm	3.4	12.3
2021-09-01	244	0	45-60cm	11.9	15.3
2021-09-01	244	1	0-15cm	0.1	0.4
2021-09-01	244	1	15-30cm	5.4	3.2
2021-09-01	244	1	30-45cm	2.8	10.9
2021-09-01	244	1	45-60cm	11.3	15.3
2021-09-01	244	Avg	0-15cm	0.1	0.7	0.4	2	4
2021-09-01	244	Avg	15-30cm	5.7	3.2	4.45	2	4
2021-09-01	244	Avg	30-45cm	3.1	11.6	7.35	2	4
2021-09-01	244	Avg	45-60cm	11.6	15.3	13.45	2	4

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2021-09-01	1	12.7
2021-09-01	102	7.4
2021-09-01	2	11.3
2021-09-01	245	3.2
2021-09-01	3	17.1
2021-09-01	4	11.9
2021-09-01	5	7.5
2021-09-01	6	19.4
2021-09-01	7	6.2
2021-09-01	72	10.3
2021-09-01	79	11.5