Field Notes

<--2021-07-29 10:00:00 | 2021-09-01 12:00:00-->
Other sites visited today: Vaira

Tonzi: 2021-08-11 10:50:00 (DOY 223)
Author: Joe Verfaillie
Others:

Summary: Dry and hot. Removed Arable, under canopy PAR, Tree2 soil CO2 profile, reset tree 7 denrometer, Road well logger down until next visit, portable toilet service canceled, midday water potential

Tonzi
2021-08-11

I arrived at 10:50 PDT. It was hot and dry. The pond is still hanging in there but just. The trees donâ€™t look any worse â€“ maybe they have lost some of their brown leaves. I could not smell any smoke but the sunlight seemed a little dim and yellow at times. There was a strong breeze most of the day.

I canceled the portable toilet contract since we have hardly used the toilet in the last year and I donâ€™t see that changing soon. The porta-potty has already been removed.

I did all the standard fieldwork collecting the eddy, met, camera, FD, soil moisture, zcam, DBH, and well data. Mostly all seemed well.
The Tower 7500 read: 419.2ppm CO2, 464.0mmol/m3 H2O, 98.8kPa, 30.8C, 99.2SS
The Floor 7500 read: 413.8ppm CO2, 525.3mmol/m3 H2O, 98.9kPa, 33.9C, 96.4SS

I ran another performance check on the FD chamber sn FD20180026 in the open location. It still had a difference in co2 concentration between chambers. Iâ€™m talking to Eosense about it.

I reset the dendrometer on tree 7.
I replaced the Allen set screw with a stainless Philips screw. The head of the screw is close to touching the body of the gauge but seems okay. I think the Philips head will make it easier to reset the gauge in the future. I also gave the gauge a dose of WD40 to improve the slide.

I removed the under canopy PAR sn 110340 from the Floor met system and updated the program after downloading all the data. I have decided that the under canopy PAR is noisy and questionably useful in this broken canopy. If someone wants to make a study of it, there is some preliminary data to help design a new experiment.

I removed the Arable Mark I unit sn A000251 â€“ this is the first unit we got by way of Joe Berry. I have not been able to get data from the Arable servers for a while. The unit looks bad due to solar degradation and the woodpeckers have removed one of the incoming sensors I think. Arable pretty much stopped supporting these units anyway.

The lithium battery pack in the Road well was dead. I bought a fresh one to swap but its status lights were not working or I couldnâ€™t see them in the bright sunlight. I thought it was dead too and did not install it. Back in the lab its status lights showed a full charge though. I should get a small power pack and solar panel for this well.

I did midday oak leaf water potential. I took twigs from LiuKangâ€™s tree and tree #251 next to the water potential table. Usually we use tree #102 but most of its leaves already had some brown on them. I tried to choose all green leaves as I think stems with leaves beginning to turn brown have already backed off the max water potential. Last time some of the stems had lower pressures (-28, -30s). This time they were all in the -40s and -50s.

I removed most of the soil CO2 profile next to LiuKangâ€™s tree (Tree2). The system has not been running for a long time due to a break in the power line. I found the break when I pulled the power line out of the ground near where it passed the solar panels. The SDI-12 line from the main data logger was too difficult to get out of the hard soil so I left it until it rains â€“ whenever that might be. I also left the PVC tubes and their thermocouples to mark the spot and to be used again it needed. I removed the box, data logger, GMT boxes and GMP probes:

CR10X sn 13214
2cm sn Z2720014
4cm sn K1350103
8cm sn F4960020
16cm sn Y0850004

The probes seemed to be in pretty good condition but need to be tested before being used again.

I left at about 14:40

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-08-11	VR_well	59.35
2021-08-11	VR_pond	13.38
2021-08-11	TZ_floor	31.82
2021-08-11	TZ_road	39.5
2021-08-11	TZ_tower	36.45

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
2021-08-11	223	0	0-15cm	3	3.4	0.1	2.4	3.3	6.8	0.1	3.3
2021-08-11	223	0	15-30cm	11.2	4.5	12.4	11.8	3.9	5.7	3.5	11.5
2021-08-11	223	0	30-45cm	12.9	9.8	12	15.9	12.9	15.4	16.5	11.3
2021-08-11	223	0	45-60cm	18.5	10.7	20.5	27.1	12.8	17	7.9	12.5
2021-08-11	223	1	0-15cm	3.9	3.4	0.3	2.4	3.6	6.2	0.6	2.7
2021-08-11	223	1	15-30cm	11.2	4.5	12.4	11.8	4.2	6.6	2	11.2
2021-08-11	223	1	30-45cm	14	9.8	11.2	16.2	12.9	15.1	17.3	10.3
2021-08-11	223	1	45-60cm	19.9	10.5	20.5	27.1	13.6	16.5	6.7	12.2
2021-08-11	223	Avg	0-15cm	3.45	3.4	0.2	2.4	3.45	6.5	0.35	3	2.84	8	16
2021-08-11	223	Avg	15-30cm	11.2	4.5	12.4	11.8	4.05	6.15	2.75	11.35	8.03	8	16
2021-08-11	223	Avg	30-45cm	13.45	9.8	11.6	16.05	12.9	15.25	16.9	10.8	13.34	8	16
2021-08-11	223	Avg	45-60cm	19.2	10.6	20.5	27.1	13.2	16.75	7.3	12.35	15.88	8	16

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
2021-08-11	223	0	0-15cm	0.3	0.4
2021-08-11	223	0	15-30cm	6.3	2.9
2021-08-11	223	0	30-45cm	3.4	11.5
2021-08-11	223	0	45-60cm	12.2	15.6
2021-08-11	223	1	0-15cm	0.1	0.7
2021-08-11	223	1	15-30cm	6	2.3
2021-08-11	223	1	30-45cm	3.9	11.7
2021-08-11	223	1	45-60cm	11.9	16.2
2021-08-11	223	Avg	0-15cm	0.2	0.55	0.38	2	4
2021-08-11	223	Avg	15-30cm	6.15	2.6	4.38	2	4
2021-08-11	223	Avg	30-45cm	3.65	11.6	7.63	2	4
2021-08-11	223	Avg	45-60cm	12.05	15.9	13.98	2	4

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2021-08-11	1	12.7
2021-08-11	102	7.8
2021-08-11	2	11.3
2021-08-11	245	3.4
2021-08-11	3	17.1
2021-08-11	4	11.9
2021-08-11	5	7.2
2021-08-11	6	19.5
2021-08-11	7	23.8
2021-08-11	7	6.1
2021-08-11	72	11.2
2021-08-11	79	11.5

Water Potential - mode: raw

Time	Species	Tree	readings (bar)
2021-08-11 12:44:00	OAK	251	-55	-56	-53
2021-08-11 12:44:00	OAK	92	-44	-45	-43

No TZ Grass Biomass data found

No TZ OakLeaves Biomass data found

No TZ PineNeedles Biomass data found

1 photos found

20210811TZ_AntSuperHighway.jpg ( 2021-08-11 13:17:01 ) Full size: 1440x1920
Thereâ€™s a cleared path about 10cm wide running between two ant mounds.