Field Notes

<--2021-11-17 11:00:00 | 2022-01-06 14:25:00-->
Other sites visited today: Tonzi | Hill Slough

Vaira: 2021-12-02 09:00:00 (DOY 336)
Author: Joe Verfaillie
Others:

Summary: reinstalled another FD chamber, swapped 7500 for calibration, spectra measurements failed, turned on cow fence.

Vaira
2021-12-02

I arrived at about 9:00 PST. The Delta was all in heavy fog. Here it was sunny and mild with little to no breeze. The grass is 5cm to 15cm tall - longer under the trees. The ground is still moist mostly from overnight dew. The puddles on the road have dried up and the water hole is a little less than completely full. The tress still have a lot of green leaves here.

I installed another FD chamber sn FD20180047 to replace the one I removed last time at the west profile. The old location had become kind of a hole with almost no litter left. I chose a new location about 10cm away, pulled the green grass and installed the chamber. I think we should move these chambers each dry season to a new location. We need to balance the disturbance and change in location with the effects caused by leaving the chamber protecting/shielding the same bit of soil years on end.

I swapped the 7500 for calibration: sn 0042 came off and sn 75H-2182 went on.
0042 read: 432.6ppm CO2, 382.7mmol/m3 H2O, 100.1kPa, 17.2C, 103.4SS
2182 read: 440.2ppm CO2, 380.4mmol/m3 H2O, 100.1kPa, 17.6C, 100.4SS
I updated the pressure coefficients and reset the box.

I measured the well depth and collected the met, flux, FD data and camera.

I did spectra measurements but was not real happy with them. The reflectance plot on the JAZ seemed to be off scale on the high end. I need to look at the data to see if it was just a plotting issue. Yep, all the spectra are off scale starting at about 750-850nm.

I did not go to the pond.

I turned on the electric fence. The cows seem to be beating a path around the outside of the fence. Last time I though the fence charger sounded funny but it seemed okay this time and was creating an energetic arc when I held the line to a fence post. The needle is stuck in the middle of the dial but otherwise it seems okay.

I left at about 10am

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-12-02	VR_well	57.6
2021-12-02	TZ_floor	32.15
2021-12-02	TZ_road	39.75
2021-12-02	TZ_tower	36.15
2021-12-02	HS	6.38
2021-12-02	HS	6.38

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
2021-12-02	336	0	0-15cm	28.8	11.8	19.4	21.2	14.7	24.7	26.1	19.4
2021-12-02	336	0	15-30cm	30.4	23.7	30.4	29.5	14.5	32.3	17.9	27.7
2021-12-02	336	0	30-45cm	31.3	23.5	29.9	32.1	29.9	39.9	33.2	34.9
2021-12-02	336	0	45-60cm	40.8	29.7	40	48	30.9	37.7	48	48
2021-12-02	336	1	0-15cm	29.1	11.8	15	20.9	14.7	25.6	26.4	19.7
2021-12-02	336	1	15-30cm	30.1	21.3	30.1	28.9	14.8	31	18.2	28
2021-12-02	336	1	30-45cm	30.4	22.6	29.9	31.5	29.6	39.6	33.8	34.9
2021-12-02	336	1	45-60cm	41.1	29.1	40	47.7	30.2	39.7	47.7	48.6
2021-12-02	336	Avg	0-15cm	28.95	11.8	17.2	21.05	14.7	25.15	26.25	19.55	20.58	8	16
2021-12-02	336	Avg	15-30cm	30.25	22.5	30.25	29.2	14.65	31.65	18.05	27.85	25.55	8	16
2021-12-02	336	Avg	30-45cm	30.85	23.05	29.9	31.8	29.75	39.75	33.5	34.9	31.69	8	16
2021-12-02	336	Avg	45-60cm	40.95	29.4	40	47.85	30.55	38.7	47.85	48.3	40.45	8	16