Field Notes

<--2022-04-12 11:00:00 | 2022-05-10 13:10:00-->
Other sites visited today: Vaira | Bouldin Alfalfa

Tonzi: 2022-04-27 11:00:00 (DOY 117)
Author: Joe Verfaillie
Others: Beckman crew

Summary: Beckman inspected the tower - sounds like it is in good shape, Added two soil matrix potential sensors, reinstalled Tree1 FD chamber, Moved IRTs for cal, midday water potential

Tonzi
2022-04-27

I arrived at about 11:00am PDT. It was clear and sunny with a light cool breeze. Many more flowers here than last time. Some puddles on the road, but I don’t think it rain since about two weeks ago. The grasses and trees look good.

A crew from Beckman Tower (Carl Jr., Matt, Lauren?) arrived at about noon in two trucks. I had quickly grabbed the data from the tower before they arrived so I could stay out of their way while they inspected the tower. They cleaned off the guy wire anchors, adjusted all the guy wires to about 700lbs, cleaned, inspected and sealed all the fittings. They used two survey instruments to inspect the tower plumb – it was nearly perfect with only one corner being half the width of the post out of line. They climbed the tower and inspected all the structure. In general they were impressed with how good of condition it was in for standing 22 years. I’ll get a report from them later.

I added two TEROS21 soil matrix potential probes to the Floor Met 23x. Both probes were installed near the Tower Moisture Point probe. Probe sn G20007112 went near the drip line on the trees 3.84m WSW (260deg) from the Moisture Point probe. Probe sn G20010035 went near the trees (roots in the hole) 0.7m W (90deg) from the Moisture Point probe. Both were installed at -10cm by digging a small hole, cutting a groove in the side, packing some wetted soil around the probe and inserting it in the groove per instructions. On the data logger they have good temps (18.4, 16.8) and matrix potential readings of -54.8kPa and -218.1kPa (-5kPa wet soil, -100,000kPa dry air). The installation video shows them inserted in a vertical plane but I inserted then in the horizontal plane – written instructions don’t specify orientation so maybe okay. In the Data logger table MP_A is sn G20007112 (drip line) and MP_B is sn G20010035 (under tree). The soil under the tree seemed a bit dryer to me.

The ground IRT by the small tree was out of its mount. I fixed it then some cows came to inspect it. I yell at them and clapped my hands and told they can't touch it.

I collected the met, flux, cameras, well and FD data. I read the dendrometers, did the manual well and soil moisture measurements. I did midday tree water potential – kind of a mix of numbers from -10 to -25Bar.
Tower 7500 read: 414.6ppm CO2, 453.0mmol/m3 H2O, 99.0kPa, 16.1C, 103.7SS
Floor 7500 read: 417.5ppm CO2, 464.2mmol/m3 H2O, 99.0kPa, 22.0C, 100.1SS

I reinstalled the Tree1 FD chamber sn FD20180048. I had removed it because I thought it was broken but it might have been reading funny because it was lying on its side. It seemed okay in the lab. I installed it in a slightly different location with more litter on the soil surface.

I did a rough job of rearranging the IRTs near the Floor solar panels to all point at the cal panel. One of the cables of an IRT point at the tree had been chewed by the cows. I cut its end off, stripped it and rewired it to the CR10X. I dragged the CR10X box over the to the cal panel and mounted the two tree IRTs and the one grass IRT on stakes in front of the cal panel. I didn’t have time to check their readings with the laptop.

I left for Vaira at about 16:10 PDT

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2022-04-27	TZ_floor	24.95
2022-04-27	TZ_road	33.5
2022-04-27	TZ_tower	28.6
2022-04-27	VR_well	54.25
2022-04-27	VR_pond	17.75

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

Date	DOY	Rep	Depth	Tower	Floor_South	Soil_Transect_3	Soil_Transect_2	Soil_Transect_1	SoilCO2_West_A	SoilCO2_West_B	SoilCO2_West_C	Soil_Transect_4	Avg	Spacial Count	Measurement Count
2022-04-27	117	0	0-15cm	15.3	8.6	12.4	14.1	6.5	23.2	15.6	7.8
2022-04-27	117	0	15-30cm	18.2		25.2	24.9	7.2	18.8	9	22.8
2022-04-27	117	0	30-45cm	19	21.5	17.9	25.4	18.7	20.1	23.2	15.4	17
2022-04-27	117	0	45-60cm	27.4	20.2	20.5	41.7	17.9	25.4	16.2	19.3	16.8
2022-04-27	117	1	0-15cm	15.6	13	13.5	12.7	6.8	22.6	15.3	8.3	13
2022-04-27	117	1	15-30cm	17.6	7.7	24.9	24.3	7.2	18.2	9.3	23.4	10.3
2022-04-27	117	1	30-45cm	19.3	21.5	17.9	25.1	19	20.9	22.9	15.6	17.3
2022-04-27	117	1	45-60cm	25.9	19.9	20.2	36	18.2	25.6	17	18.8	17
2022-04-27	117	2	0-15cm									12.7
2022-04-27	117	2	15-30cm									16.8
2022-04-27	117	2	30-45cm									16.2
2022-04-27	117	Avg	0-15cm	15.45	10.8	12.95	13.4	6.65	22.9	15.45	8.05	12.85	13.17	9	18
2022-04-27	117	Avg	15-30cm	17.9	7.7	25.05	24.6	7.2	18.5	9.15	23.1	13.55	16.31	9	17
2022-04-27	117	Avg	30-45cm	19.15	21.5	17.9	25.25	18.85	20.5	23.05	15.5	16.83	19.84	9	19
2022-04-27	117	Avg	45-60cm	26.65	20.05	20.35	38.85	18.05	25.5	16.6	19.05	16.9	22.44	9	18

No VR Moisture Point data found

No TZ grass heigth found

Grass Height VR 13

Date	Height reps (cm)													Location	Average	Samp	STDEV
2022-04-27	40	23	42	13	50	30	15	20	35	22	50	26	20	GH_ALL	29.69	13	12.12

Tree DBH

Date	Tag#	Reading (mm)
2022-04-27	1	21.3
2022-04-27	102	18.9
2022-04-27	2	18.1
2022-04-27	245	5.4
2022-04-27	3	21.1
2022-04-27	4	18.2
2022-04-27	5	10.2
2022-04-27	6	20.9
2022-04-27	7	12.0
2022-04-27	72	15.4
2022-04-27	79	13.8