Field Notes

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Tonzi: 2021-05-19 11:40:00 (DOY 139)
Author: Joe Verfaillie
Others: Dennis, Antoine Cabon

Summary: Standard field work, oak tree rings, discus throwing, replaced Floor well cable, brought in cal panel IRT to clean out wasp larva.

Tonzi
2021-05-19

Dennis and I arrived at about 11:40. Antoine Cabon had just arrived to meet us and take oak tree ring samples. It was clear, sunny and mild with a cool breeze that shifted from SSW to SE. We didnâ€™t see any cows all day but on our way out the herd of young cows showed up near the water trough and we met a man in a truck that was looking them over for auction. The trees look okay but maybe a little thin on leaves. The grass is mostly dead.

Antoine Cabon started taking cores from the oaks mainly to the west of the tower. We left him there to continue his work around 14:45. He sampled 20 oaks in total, which was the original objective and took cookies from three lying stems which looked like they had fallen recently. I have also sampled the large tree on the left of the solar panels that Dennis asked me to do (I hope that was the right one). For the large ones, part of the hard wood was rotten but still a decent amount of rings are visible so that should enable us to go back far enough in time. One issue might be that especially in the case of the large trees, the outermost rings are very narrow so that may complicate the reading, but with 20 individuals we should still be able to have a decent chronology.

Dennis did the soil moisture, well levels, midday water potential and threw discus. I tried throwing the discus a few times but my muscles are not used to those motions and my hand seems too small to hold the discus comfortably.

I collected the eddy data â€“ I cleaned both IRGAs. Calibration is due in a week or so.
The Tower read: 419.8ppm CO2, 295.3mmol/m3 H2O, 18.3C, 98.8kPa, 102.9SS
The Floor read: 429.3ppm CO2, 296.1mmol/m3 H2O, 21.3C, 98.9kPa, 101.7SS

I collected the other data loggers and FD chambers, the IRT CR1000 needed resetting to update at the Tower. I serviced the zcams. Z-cam 3 was twisted around to the north this time. I put it back in its usual position to the east of the post and tried to tighten the zip ties holding it in place.

I replaced the cable to the Floor well. The new cable is in flexible aluminum conduit and moves the junction box back to the well pipe so that the original sensor cable and vent are protected inside the well pipe. I hope this solves the problem with cows chew on the line.

At the IRT cal panel I discovered that a wasp had deposited larva and sealed the IRTâ€™s view port with mud. I removed sensor sn 1624 from the mount on the cal panel and move sn 7385 from the grass location to the cal panel until I can get the other one cleaned up. Although, now that I think about it the grass was probably more important than the cal panel.

We left at about 14:40

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-05-19	TZ_floor	30.45
2021-05-19	TZ_road	38.5
2021-05-19	TZ_tower	34.7
2021-05-19	VR_well	56.8
2021-05-19	VR_pond	16.3

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower_1 [1] => Floor_South_1 [2] => Soil_Transect_3_1 [3] => Soil_Transect_2_1 [4] => Soil_Transect_1_1 [5] => SoilCO2_West_A_1 [6] => SoilCO2_West_B_1 [7] => SoilCO2_West_C_1 [8] => Tower_2 [9] => Soil_Transect_4_2 [10] => Soil_Transect_3_2 [11] => Soil_Transect_2_2 [12] => Soil_Transect_1_2 [13] => SoilCO2_West_A_2 [14] => SoilCO2_West_C_2 [15] => Tower_3 [16] => Floor_South_3 [17] => Soil_Transect_4_3 [18] => Soil_Transect_3_3 [19] => Soil_Transect_2_3 [20] => Soil_Transect_1_3 [21] => SoilCO2_West_A_3 [22] => SoilCO2_West_B_3 [23] => SoilCO2_West_C_3 [24] => Tower_4 [25] => Soil_Transect_4_4 [26] => Soil_Transect_3_4 [27] => Soil_Transect_2_4 [28] => Soil_Transect_1_4 [29] => SoilCO2_West_A_4 [30] => SoilCO2_West_B_4 [31] => SoilCO2_West_C_4 [32] => Floor_South_2 [33] => SoilCO2_West_B_2 )

0000

Date	DOY	Rep	Depth	Tower_1	Floor_South_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	Soil_Transect_4_2	Soil_Transect_3_2	Soil_Transect_2_2	Soil_Transect_1_2	SoilCO2_West_A_2	SoilCO2_West_C_2	Tower_3	Floor_South_3	Soil_Transect_4_3	Soil_Transect_3_3	Soil_Transect_2_3	Soil_Transect_1_3	SoilCO2_West_A_3	SoilCO2_West_B_3	SoilCO2_West_C_3	Tower_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	Floor_South_2	SoilCO2_West_B_2	Spacial Count
2021-05-19	139	0	nan	5.3	8.6	7.7	4.5	5.3	10	4.7	3	12.7	8.4	13.6	12.7	5.1	7.8	13	15.1	29	11.7	16.8	18.2	15.1	16.5	17	11.5	23.1	13.3	22.5	31.4	15.6	22.8	13.9	16.5
2021-05-19	139	1	nan	5	3.6	8.3		6.2	9.7	4.5	2.7	12.7	6.6	13.3	12.7	4.8	8.4	12.4	16.2	29.6	11.2	17.3	17.9	15.4	15.9	17	11.7	22.2	14.8	22.8	30.8	15.3	22.5	14.2	16.8	2.2
2021-05-19	139	2	nan	5	0.9	8.3	4.5	6.2	9.4	4.5	2.7	13	6.3	13.6	12.7	5.1	8.1	12.1	16.2	28.5	11.7	17	17.9	14.8	15.9	17	12	21.9	13.6	23.4	32.3	15.6	21.9	14.2	16.8	7.5	0.5
2021-05-19	139	Avg	0-15cm																																			0
2021-05-19	139	Avg	15-30cm																																			0
2021-05-19	139	Avg	30-45cm																																			0
2021-05-19	139	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
2021-05-19	139	0	nan	0.1	0.3	7.8	4.5	4.5	10.6	11.6	13.3
2021-05-19	139	1	nan	0.1	0.1	7.6	4.8	3.7	11.5	11	13.9
2021-05-19	139	2	nan	0.7	0.1	7.8	3.9	3.5	11.7	10.7	13.9
2021-05-19	139	Avg	0-15cm									0
2021-05-19	139	Avg	15-30cm									0
2021-05-19	139	Avg	30-45cm									0
2021-05-19	139	Avg	45-60cm									0

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2021-05-19	1	12.9
2021-05-19	102	8.5
2021-05-19	2	13.6
2021-05-19	245	14.0
2021-05-19	3	17.9
2021-05-19	4	11.9
2021-05-19	5	6.2
2021-05-19	6	17.0
2021-05-19	7	20.0
2021-05-19	72	12.4
2021-05-19	79	12.3