Field Notes

<--2020-01-28 10:15:00 | 2020-02-27 11:30:00-->
Other sites visited today: Bouldin Corn | Tonzi | West Pond
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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 [1] => Floor_South_1 [2] => Floor_West_1 [3] => Soil_Transect_4_1 [4] => Soil_Transect_3_1 [5] => Soil_Transect_2_1 [6] => Soil_Transect_1_1 [7] => SoilCO2_West_A_1 [8] => SoilCO2_West_B_1 [9] => SoilCO2_West_C_1 [10] => Tower_2 [11] => Floor_South_2 [12] => Floor_West_2 [13] => Soil_Transect_4_2 [14] => Soil_Transect_3_2 [15] => Soil_Transect_2_2 [16] => Soil_Transect_1_2 [17] => SoilCO2_West_A_2 [18] => SoilCO2_West_B_2 [19] => SoilCO2_West_C_2 [20] => Tower_3 [21] => Floor_South_3 [22] => Floor_West_3 [23] => Soil_Transect_4_3 [24] => Soil_Transect_3_3 [25] => Soil_Transect_1_3 [26] => SoilCO2_West_A_3 [27] => SoilCO2_West_B_3 [28] => SoilCO2_West_C_3 [29] => Tower_4 [30] => Floor_South_4 [31] => Floor_West_4 [32] => Soil_Transect_4_4 [33] => Soil_Transect_3_4 [34] => Soil_Transect_2_4 [35] => Soil_Transect_1_4 [36] => SoilCO2_West_A_4 [37] => SoilCO2_West_B_4 [38] => SoilCO2_West_C_4 [39] => Soil_Transect_2_3 )

0000

Date	DOY	Rep	Depth	Tower_1	Floor_South_1	Floor_West_1	Soil_Transect_4_1	Soil_Transect_3_1	Soil_Transect_2_1	Soil_Transect_1_1	SoilCO2_West_A_1	SoilCO2_West_B_1	SoilCO2_West_C_1	Tower_2	Floor_South_2	Floor_West_2	Soil_Transect_4_2	Soil_Transect_3_2	Soil_Transect_2_2	Soil_Transect_1_2	SoilCO2_West_A_2	SoilCO2_West_B_2	SoilCO2_West_C_2	Tower_3	Floor_South_3	Floor_West_3	Soil_Transect_4_3	Soil_Transect_3_3	Soil_Transect_1_3	SoilCO2_West_A_3	SoilCO2_West_B_3	SoilCO2_West_C_3	Tower_4	Floor_South_4	Floor_West_4	Soil_Transect_4_4	Soil_Transect_3_4	Soil_Transect_2_4	Soil_Transect_1_4	SoilCO2_West_A_4	SoilCO2_West_B_4	SoilCO2_West_C_4	Soil_Transect_2_3	Spacial Count
2020-02-12	43	0	nan	20.6	10.9	18.5	15	14.4	28.5	19.7	31.1	25	17.1	24.3	24	29.8	21	30.1	27.1	16.1	25.5	17	28	25.4	31.5	34.9	24.3	31.3	30.7	33.8	32.9	35.4	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	nan	21.4	10.9	21.7	15.6	13.8	28.2	20.9	30.2	24.1	17.6	23.1	23.7	28	21	29.8	27.4	15.5	24.3	15.8	28.9	26.8	31.3	33.5	24.6	31.3	30.1	33.8	32.4	36.3	35.4	14.8		29.1	41.1	45.4	29.1	43.1	48	47.7	38.5
2020-02-12	43	2	nan			21.4			25.3							28.6			26.8							34.6									42.3			45.7					31.9
2020-02-12	43	3	nan			21.2			26.8							28			40.5							34.3									45.1								46.6
2020-02-12	43	4	nan						27										27.4																			49.1					38
2020-02-12	43	Avg	0-15cm																																									0
2020-02-12	43	Avg	15-30cm																																									0
2020-02-12	43	Avg	30-45cm																																									0
2020-02-12	43	Avg	45-60cm																																									0

mode = both
Moisture Point Probes VR
Array ( [0] => Flux_Tower_1 [1] => Biomass_Cage_1 [2] => Flux_Tower_2 [3] => Biomass_Cage_2 [4] => Flux_Tower_3 [5] => Biomass_Cage_3 [6] => Flux_Tower_4 [7] => Biomass_Cage_4 )

0000

Date	DOY	Rep	Depth	Flux_Tower_1	Biomass_Cage_1	Flux_Tower_2	Biomass_Cage_2	Flux_Tower_3	Biomass_Cage_3	Flux_Tower_4	Biomass_Cage_4	Spacial Count
2020-02-12	43	0	nan	17.3	7.7	28.3	17.3	14.5	26.8	28.2	29.4
2020-02-12	43	1	nan	17.6	7.7	28.3	17.6	14.8	26	27.1	28.2
2020-02-12	43	Avg	0-15cm									0
2020-02-12	43	Avg	15-30cm									0
2020-02-12	43	Avg	30-45cm									0
2020-02-12	43	Avg	45-60cm									0

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