Field Notes

<--2020-01-28 10:15:00 | 2020-02-27 11:30:00-->
Other sites visited today: Bouldin Corn | Tonzi | West Pond

Vaira: 2020-02-12 11:00:00 (DOY 43)
Author: Joe Verfaillie
Others: Daphne

Summary: Clear, sunny and warm, standard field work, swapped 7500, met Rick Littlefield

Vaira
2020-02-12

Daphne and I arrived at about 11:00. It was clear sunny and warm. The puddles on the road have dried up. The water hole is only about half full. I met Rick Littlefield, a neighbor who has leeway across the Vaira Ranch. I asked about the lack of rain and he said itâ€™s not so bad yet as the temperatures have been cold and the grass is not growing fast yet. Here the grass looks green, was damp with dew and is very dense but still only about 5cm high. At Tonzi there are definite brown patches. Rick also said he would be improving the road (adding culverts) and I gave him my contact info so he can tell us when the road is impassible.

Daphne collected the data, measured the well, did spectral measurements and cleaned the rad sensors.

I did the moisture point measurement. The probe near the tower seems to be bad â€“ the top two readings look bad for sure, maybe the others.

I also took three clip plots. The grass was very dense and small. It took three hours to sort the green from the dead and even then it was impossible to sort it completely. I ran the green samples through the LAI scanner three times each with relatively good agreement between runs. The grass was sprinkled onto the scanner belt so there was considerable overlap of leaves but maybe not as much as shading in situ.

We left at noon and forgot to swap the 7500 for calibration but came back at 2pm after visiting Tonzi: sn 0035 came down and sn 0073 went up.
sn 0035 off: 424.7ppm CO2, 292.5mmol/m3 H2O, 99.6kPa, 24.5C, 99.4SS
sn 0073 on: 419.1ppm CO2, 302.2mmol/m3 H2O, 99.7kPa, 21.9C, 102.0SS

We left about 14:15

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2020-02-12	VR_well	57.47
2020-02-12	TZ_floor	29.8
2020-02-12	TZ_tower	34.55
2020-02-12	TZ_road	38

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower [1] => Floor_South [2] => Floor_West [3] => Soil_Transect_4 [4] => Soil_Transect_3 [5] => Soil_Transect_2 [6] => Soil_Transect_1 [7] => SoilCO2_West_A [8] => SoilCO2_West_B [9] => SoilCO2_West_C )

Date	DOY	Rep	Depth	Tower	Floor_South	Floor_West	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
2020-02-12	43	0	0-15cm	20.6	10.9	18.5	15	14.4	28.5	19.7	31.1	25	17.1
2020-02-12	43	0	15-30cm	24.3	24	29.8	21	30.1	27.1	16.1	25.5	17	28
2020-02-12	43	0	30-45cm	25.4	31.5	34.9	24.3	31.3		30.7	33.8	32.9	35.4
2020-02-12	43	0	45-60cm	35.4	14.5	45.7	28.2	40.8	45.4	30.2	43.4	48.6	47.4
2020-02-12	43	1	0-15cm	21.4	10.9	21.7	15.6	13.8	28.2	20.9	30.2	24.1	17.6
2020-02-12	43	1	15-30cm	23.1	23.7	28	21	29.8	27.4	15.5	24.3	15.8	28.9
2020-02-12	43	1	30-45cm	26.8	31.3	33.5	24.6	31.3	38.5	30.1	33.8	32.4	36.3
2020-02-12	43	1	45-60cm	35.4	14.8		29.1	41.1	45.4	29.1	43.1	48	47.7
2020-02-12	43	2	0-15cm			21.4			25.3
2020-02-12	43	2	15-30cm			28.6			26.8
2020-02-12	43	2	30-45cm			34.6			31.9
2020-02-12	43	2	45-60cm			42.3			45.7
2020-02-12	43	3	0-15cm			21.2			26.8
2020-02-12	43	3	15-30cm			28			40.5
2020-02-12	43	3	30-45cm			34.3			46.6
2020-02-12	43	3	45-60cm			45.1
2020-02-12	43	4	0-15cm						27
2020-02-12	43	4	15-30cm						27.4
2020-02-12	43	4	30-45cm						38
2020-02-12	43	4	45-60cm						49.1
2020-02-12	43	Avg	0-15cm	21	10.9	20.7	15.3	14.1	27.16	20.3	30.65	24.55	17.35	20.2	10	25
2020-02-12	43	Avg	15-30cm	23.7	23.85	28.6	21	29.95	29.84	15.8	24.9	16.4	28.45	24.25	10	25
2020-02-12	43	Avg	30-45cm	26.1	31.4	34.33	24.45	31.3	38.75	30.4	33.8	32.65	35.85	31.9	10	24
2020-02-12	43	Avg	45-60cm	35.4	14.65	44.37	28.65	40.95	46.4	29.65	43.25	48.3	47.55	37.92	10	23

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
2020-02-12	43	0	0-15cm	17.3	7.7
2020-02-12	43	0	15-30cm	28.3	17.3
2020-02-12	43	0	30-45cm	14.5	26.8
2020-02-12	43	0	45-60cm	28.2	29.4
2020-02-12	43	1	0-15cm	17.6	7.7
2020-02-12	43	1	15-30cm	28.3	17.6
2020-02-12	43	1	30-45cm	14.8	26
2020-02-12	43	1	45-60cm	27.1	28.2
2020-02-12	43	Avg	0-15cm	17.45	7.7	12.58	2	4
2020-02-12	43	Avg	15-30cm	28.3	17.45	22.88	2	4
2020-02-12	43	Avg	30-45cm	14.65	26.4	20.53	2	4
2020-02-12	43	Avg	45-60cm	27.65	28.8	28.23	2	4

No TZ grass heigth found

No VR grass heigth found

No VR Tree DBH found

No water potential data found

No VR Grass Biomass data found

No VR OakLeaves Biomass data found

No VR PineNeedles Biomass data found

2 photos found

20200212VR_panorama.jpg ( 2020-02-12 14:08:43 ) Full size: 1920x881
Panorama of a spring-like day with green grass overtaking previous litter cover