Field Notes

<--2015-05-06 10:00:00 | 2015-05-20 11:00:00-->
Other sites visited today: Vaira | Tonzi

Tonzi: 2015-05-06 11:15:00 (DOY 126)
Author: Joe Verfaillie
Others: Siyan, Dennis, Ana

Summary: Standard fieldwork, midday water potential, added power converter to Tower sonic, changed Tower CR1000 program, installed two IRT sensors, broken power converter at soil CO2 23X.

Tonzi
2015-05-06

I arrived about 11:15 with Siyan, Dennis and Ana. It was a beautiful, warm day with a nice breeze. The ground is dry, but the grass is still green in the low spots and there are lots of flowers.

I worked on the tower sonic again. The computer and winflux were running but the CR1000 was locked up. Winflux recorded the sonic data but not the 7500 data because the new sonic cable did not have the correct pins for the analog channels. I think the CR1000 was locked up due to changes I made for the diffuse PAR sensor â€“ the differential voltage command was using 60Hz rejection which was taking more than 16ms to run, the scan interval was only 20ms. I change the CR1000 program to do the differential reading using 250us instead. I also added a power converter to the sonic to keep its supply voltage at 12V even when the solar voltage drops to 10V.

I made measurements of the rotating shadow band to calculate how much of the sky is blocked. I also made notes of the wiring of the solar panels for possible upgrade of the solar system to 24V.

Ana set up a tripod with two IRT sensors on a small tree to the east just north of the road. One sensor, sn 1965, is point down on top of the tree from about 30cm away. The other sensor, sn 1964, is pointed at the ground from about 50cm on a spot cleared of vegetation. The system is running on a CR1000 sn 66249, small solar panel and a sealed 9Ah battery with a charge controller.

Dennis did moisture point measurements. He also discovered that the power converter on the soil CO2 CR23X seemed to be dead. He stole the one from the soil CO2 CR10X for the time being. We will get the open and tree 1 data, but not the tree 2 data. Dennis also serviced the zcams. The window on zcam 1 came off. We put it back on ans sealed it with some grease, but it needs new glue next time.

Siyan did the standard fieldwork including midday water potential.

We check the wind profile system. All sensors were reporting reasonable numbers. We took apart the bottom sensor that was reading bad last time and it was dry inside, but there was a water stain in the plastic connecter. We put a small desiccant pack inside the body when we reassembled it. We did not check the other sensors.

Field Data

CO2 Profile Tanks

Date	Tank	Pressure (psi)	ppm
2015-05-06	CO2	1500	405
2015-05-06	N2	950	0

Well Depth

Date	Location	Depth (feet)
2015-05-06	TZ_floor	27.6
2015-05-06	TZ_road	36.3
2015-05-06	TZ_tower	31.3

mode = both
Moisture Point Probes TZ
Array ( [0] => Tower [1] => Floor_South [2] => Floor_East [3] => Floor_West [4] => SoilCO2 [5] => Soil_Transect_4 [6] => Soil_Transect_3 [7] => Soil_Transect_2 [8] => Soil_Transect_1 [9] => SoilCO2_West_A [10] => SoilCO2_West_B [11] => SoilCO2_West_C )

Date	DOY	Rep	Depth	Tower	Floor_South	Floor_East	Floor_West	SoilCO2	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
2015-05-06	126	0	0-15cm	8.3	6.8	39.9	13.8	11.1	4.7	9.7	8.6	7.7	13.2	7.7	6.2
2015-05-06	126	0	15-30cm	10.9	14.8	14.5	9	14.5	12.1	16.7	16.4	6.3	12.4	2	14.8
2015-05-06	126	0	30-45cm	15.6	14.5	39.6	19.8	16.5	11.5	18.2	20.9	16.5	20.4	18.4	16.5
2015-05-06	126	0	45-60cm	11.9	13.6	41.4	25.6	88.7	13	21.6	31.9	13.3	24.5	21.3	25.1
2015-05-06	126	1	0-15cm	8	6.8	39.9	13.2	11.1	4.5	10	2.1	8.6	14.4	8	6.5
2015-05-06	126	1	15-30cm	11.2	15.5	14.5	10.3	14.2	12.4	16.4	17	6	12.7	2.3	14.5
2015-05-06	126	1	30-45cm	16.5	14.8	39.6	19	18.7	11.2	18.2	20.4	16.5	20.4	18.4	17.3
2015-05-06	126	1	45-60cm	12.5	14.5	41.4	25.6	11.1	14.2	22.2	32.5	13.3	25.4	20.5	25.9
2015-05-06	126	2	0-15cm	8	6.5	39.9	11.1	11.1		9.7	8.8	7.4	13.8	8	5.6
2015-05-06	126	2	15-30cm	10.9	15.2	14.8	9.7	14.8		17.3	16.7	6	12.7	2	14.5
2015-05-06	126	2	30-45cm	16.5	14.5	39.6	19.8	16.5		18.4	20.7	16.8	19.8	18.4	17
2015-05-06	126	2	45-60cm	11.6	14.5	41.4	25.6	22.4		22.8	32.2	13.6	24.8	20.5	25.9
2015-05-06	126	Avg	0-15cm	8.1	6.7	39.9	12.7	11.1	4.6	9.8	6.5	7.9	13.8	7.9	6.1	11.26	12	35
2015-05-06	126	Avg	15-30cm	11	15.17	14.6	9.67	14.5	12.25	16.8	16.7	6.1	12.6	2.1	14.6	12.17	12	35
2015-05-06	126	Avg	30-45cm	16.2	14.6	39.6	19.53	17.23	11.35	18.27	20.67	16.6	20.2	18.4	16.93	19.13	12	35
2015-05-06	126	Avg	45-60cm	12	14.2	41.4	25.6	40.73	13.6	22.2	32.2	13.4	24.9	20.77	25.63	23.89	12	35

mode = both
Moisture Point Probes VR
Array ( [0] => Solar_Panels [1] => Flux_Tower [2] => Gate [3] => Biomass_Cage )

Date	DOY	Rep	Depth	Solar_Panels	Flux_Tower	Gate	Biomass_Cage	Avg	Spacial Count	Measurement Count
2015-05-06	126	0	0-15cm	39.9	39.9	4.7	39.9
2015-05-06	126	0	15-30cm	50	50	6.3	50
2015-05-06	126	0	30-45cm	16.8	39.6	39.6	39.6
2015-05-06	126	0	45-60cm	41.4	13	41.4	14.5
2015-05-06	126	1	0-15cm	39.9	39.9	4.7	39.9
2015-05-06	126	1	15-30cm	9.7	50	6.9	50
2015-05-06	126	1	30-45cm	17	39.6	39.6	39.6
2015-05-06	126	1	45-60cm	41.4	12.6	41.4	14.2
2015-05-06	126	2	0-15cm	39.9	39.9		39.9
2015-05-06	126	2	15-30cm	7.2	50		50
2015-05-06	126	2	30-45cm	15.9	39.6		39.6
2015-05-06	126	2	45-60cm	41.4	12.8		14.8
2015-05-06	126	Avg	0-15cm	39.9	39.9	4.7	39.9	31.1	4	11
2015-05-06	126	Avg	15-30cm	22.3	50	6.6	50	32.23	4	11
2015-05-06	126	Avg	30-45cm	16.57	39.6	39.6	39.6	33.84	4	11
2015-05-06	126	Avg	45-60cm	41.4	12.8	41.4	14.5	27.53	4	11

No TZ grass heigth found

Grass Height VR 22

Date	Height reps (cm)																						Location	Average	Samp	STDEV
2015-05-06	50	40	37	42	48	62	40	50	68	75	50	54	45	53	25	37	33	33	44	36	78	40	GH_ALL	47.27	22	13.32

Tree DBH

Date	Tag#	Reading (mm)
2015-05-06	102	12.0
2015-05-06	2	14.5
2015-05-06	245	21.5
2015-05-06	3	15.3
2015-05-06	4	11.5
2015-05-06	5	14.2
2015-05-06	7	11.8
2015-05-06	72	21.0
2015-05-06	79	17.5
2015-05-06	8	15.5

Water Potential - mode: raw

Time< h>	Species	Tree	readings (bar)
2015-05-06 12:00:00	OAK	102	-13	-12	-14
2015-05-06 12:00:00	OAK	35	-20	-23	-12
2015-05-06 12:00:00	OAK	92	-22	-20	-24
2015-05-06 12:15:00	PINE	OLD	-20	-23	-4
2015-05-06 12:15:00	PINE	YNG	-4	-5	-2

OAK_102	Whole Study	20150506	12:00:00	twig/leaf cluster	-1.3	0.1	3
OAK_35	Whole Study	20150506	12:00:00	twig/leaf cluster	-1.8	0.57	3
OAK_92	Whole Study	20150506	12:00:00	twig/leaf cluster	-2.2	0.2	3
PINE_OLD	Whole Study	20150506	12:15:00	twig/leaf cluster	-1.6	1.02	3
PINE_YNG	Whole Study	20150506	12:15:00	twig/leaf cluster	-0.4	0.15	3