Field Notes

<--2021-07-13 11:50:00 | 2021-08-11 10:50:00-->
Other sites visited today: Vaira
Phenocam link: Searching...

Tonzi: 2021-07-29 10:00:00 (DOY 210)
Author: Joe Verfaillie
Others:

Summary: Cleaned and sealed tower battery terminals, standard data collection, midday water potential, brown leaves on the trees, left most of the met data in the field

Tonzi
2021-07-29

I arrived at about 10:00 PDT. It was clear sunny and hot with an occasional breeze from the west. Poor air quality was forecast for Sacramento due to smoke from the fires and I thought the sunlight had a slightly orange cast, but I couldnâ€™t smell any smoke. Some of the trees had a lot of brown leaves and most of the trees had some brown leaves. There seemed to be a lot of fresh brown leaves on the ground in places.

At the tower battery bank sn BB-TT I cleaned the battery terminals, replaced the affected battery cables and sealed all the connections. Power was down for a short time while I did the last pair of batteries. I collected data afterwards and everything seemed to have rebooted okay. All the Phenocam image had the correct date but I did not check the camera after the power outage â€“ itâ€™s probably okay after all it goes all night without power.

I collected the flux data.
The Tower 7500 read: 422.4ppm CO2, 556.4mmol/m3 H2O, 98.8kPa, 31.0C, 100.4SS
The Floor 7500 read: 419.5ppm CO2, 572.6mmol/m3 H2O, 98.8kPa, 33.8C, 96.7SS
I lowered the Tower eddy post to clean the 7500 windows.

I measured the soil moisture and wells, read the dendrometers and serviced the zcams. I still need to reset the dendrometer on tree 7 â€“ bring a new screw and WD-40 next time.

I did the midday water potential measurements. The measurements started out much like I expected being about 5bar higher than last time. But then I got some 5 to 10bars less than last time too. Iâ€™m wondering if the trees are stopping supplying water to some of their leaves, pressures are reducing and leaves are turning brown.

I collected and cleared the FD data and then did a performance check on FD chamber sn FD20180048 under the tree. The chamber was unfastened and set on its side. It checked out okay and its concentrations were reset to 400ppm.

I managed to leave the USB stick with most of the met data plugged into the Tower computer â€“ so no met data until next visit.

I left at about 13:45

Field Data

No tank data

Well Depth

Date	Location	Depth (feet)
2021-07-29	VR_well	59
2021-07-29	TZ_floor	31.7
2021-07-29	TZ_road	39.4
2021-07-29	TZ_tower	36.25

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower_1 [1] => Soil_Transect_3_1 [2] => Soil_Transect_2_1 [3] => Soil_Transect_1_1 [4] => SoilCO2_West_A_1 [5] => SoilCO2_West_B_1 [6] => SoilCO2_West_C_1 [7] => Tower_2 [8] => Soil_Transect_3_2 [9] => Soil_Transect_2_2 [10] => Soil_Transect_1_2 [11] => SoilCO2_West_A_2 [12] => SoilCO2_West_B_2 [13] => SoilCO2_West_C_2 [14] => Tower_3 [15] => Soil_Transect_4_3 [16] => Soil_Transect_3_3 [17] => Soil_Transect_2_3 [18] => Soil_Transect_1_3 [19] => SoilCO2_West_A_3 [20] => SoilCO2_West_B_3 [21] => SoilCO2_West_C_3 [22] => Tower_4 [23] => Soil_Transect_4_4 [24] => Soil_Transect_3_4 [25] => Soil_Transect_2_4 [26] => Soil_Transect_1_4 [27] => SoilCO2_West_A_4 [28] => SoilCO2_West_B_4 [29] => SoilCO2_West_C_4 [30] => Soil_Transect_4_1 [31] => Soil_Transect_4_2 )

0000

Date	DOY	Rep	Depth	Tower_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_3_2	Soil_Transect_2_2	Soil_Transect_1_2	SoilCO2_West_A_2	SoilCO2_West_B_2	SoilCO2_West_C_2	Tower_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	Soil_Transect_4_1	Soil_Transect_4_2	Spacial Count
2021-07-29	210	0	nan	3.3	0.6	3	3	8.3	3	3	11.5	12.7	11.5	4.2	5.7	1.7	10.9	14	9.2	11.7	16.2	13.4	14.3	14.8	10.9	19.6	10.7	21.6	27.6	13.3	17	8.2	12.5
2021-07-29	210	1	nan	3.9	0.6	4.5	3	7.4	2.7	2.7	10.6	12.1	11.8	4.2	6.3	1.7	11.2	14.3	9.8	11.7	15.9	12.9	14.8	14.8	10.9	19.1	10.5	21.6	28.2	13.9	17.6	8.2	12.5	2.2	4.5
2021-07-29	210	2	nan																9.8								11							0.7	5.1
2021-07-29	210	Avg	0-15cm																																	0
2021-07-29	210	Avg	15-30cm																																	0
2021-07-29	210	Avg	30-45cm																																	0
2021-07-29	210	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
2021-07-29	210	0	nan	0.1	0.4	6.3	2.9	3.1	11.7	11.6	15.9
2021-07-29	210	1	nan	1.6	0.1	6.3	2.6	3.9	12	11.3	15.9
2021-07-29	210	Avg	0-15cm									0
2021-07-29	210	Avg	15-30cm									0
2021-07-29	210	Avg	30-45cm									0
2021-07-29	210	Avg	45-60cm									0

No TZ grass heigth found

No VR grass heigth found

Tree DBH

Date	Tag#	Reading (mm)
2021-07-29	1	12.9
2021-07-29	102	7.9
2021-07-29	2	11.2
2021-07-29	245	3.5
2021-07-29	3	17.2
2021-07-29	4	11.9
2021-07-29	5	7.6
2021-07-29	6	19.4
2021-07-29	7	23.8
2021-07-29	72	11.5
2021-07-29	79	11.6