Field Notes

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Tonzi/Vaira: 2003-07-17 10:00:00 (DOY 198)
Author: LiuKang Xu
Others: Jianwu, Qi Chen

Summary: Standard fieldwork, installed two more soil co2 sensors at -24cm, leaf samples for CASI image - 9 plots

When: July 17, 2003 D198
Where: Tonzi/Vaira Ranches
Who: Liukang Xu, Jianwu Tang, Qi Chen
Weather Sunny, little windy, temperature 106oF (at Sacramento). At the site temperature was 42.09oC at 15:30 from the floor met station.

Trip Purpose: check 3 flux systems and download data, soil moisture probe reading, Soil CO2 flux measurement, install two additional soil CO2 probe, sample leaf sample at 9 locations in Mr. Tonzi’s ranch for CASI image.

Tower system: was running good, but again we are still missing lot of data. We captured only 60% of data in last 10 days, while Floor and Vaira had much higher data capturing percentage for the same period.

Percentage of data capturing for three flux systems during the period of d188.65-198.65.

percentage (%)
Tower 60.1
Floor 88.9
Vaira 100

Download data, after reboot pc, gillsonic outputs:

Tower mean std mean std
w 1.01 0.756 Ts 45.63 0.76
u 3.97 1.855 q 1.683 0.02
v 0.22 0.308 CO2 1.381 0.013

Problem: the pump for the CO2 profile was broken.

Floor system: System running good, we got more than enough solar power, PV reading 13.5, 7.5 and 2.5. All data loggers working good. Replaced battery for Nancy’s sapflow (the one near the floor tower).

Floor mean std mean std
w 0.58 0.245 Ts 45.934 1.151
u 0.8 0.441 q 1.93 0.009
v 0.66 0.383 CO2 1.447 0.013

Vaira site: Arrived 6:35, fence and flux system running great. But the watchdog program quit working, fortunately we didn’t miss any single data points. PV reading 12.7, 1.5 and 3.0.

Vaira mean std mean std
w 0.3 0.335 Ts 42.172 0.391
u -1.1 0.484 q 1.83 0.009
v -1.22 0.541 CO2 1.161 0.003

Soil moisture probe reading

7/17/2003 7931AFE 402165 574B4B 402FF3 57632 7A432E 7A3C6E 7A3B40 7A4AAA
198 canopy canopy open drip line open
tower understory solar panel sap flow resp trans Jianwu's transect
0-15cm 6.73 3.97 10.40 1.30 6.73 7.20 5.70 4.83 1.33
15-30cm 12.60 14.60 13.60 12.27 14.60 6.33 14.30 10.90 2.00
30-45cm 17.50 6.50 14.47 13.60 1.60 9.07 15.43 16.23 13.07
45-60cm 13.73 6.87 12.20 11.73 10.93 10.27 6.00 17.77 8.60
I noticed one pin (the top one) was broken for 7931AFE
573FAA 7933FDE
open open
solar panel flux tower Operator
0-15cm 1.83 1.87 Liukang, Jianwu. Qi
15-30cm 6.03 10.20
30-45cm 11.20 14.90
45-60cm 19.23 21.33

Jianwu’s Note

CO2 efflux measurements are averaged 2 micro mol s-1 m-2 under the tree, and 0.5 micro mol s-1m-2 in the open area. The stem respiration is about 1.5-2 micro mol s-1m-2. I installed two more CO2 sensors in soil, one in the open at 24cm, and one under the tree at 24cm. The concentrations in the open are about 350ppm (2cm), 800ppm(8cm), 1400 ppm(16cm), and 1700ppm (24cm); under trees are 1700ppm (2cm), 4300ppm(8cm), 7800 ppm(16cm), and 11200ppm (24cm), much more than those in the open.

Qi Chen’s Note

We arrived the field site at around 10:00am, and Liukang and I then began to collect the leaf samples.

As planned, we sampled two trees in nine study plots. In each trees, we got 6 leaf samples at the top, east, south, west, north and center portions of trees, respectively. The leaf samples are put in Ziplocs and stored in the cooler.

When sampling, there are several issues:
1)It is difficult to locate the plots with dense trees.
We located the study plots with GPS and IKONOS imagery. For the sparse area where there are few trees, it is easy to locate the plots; however for areas with dense trees like the north and east-north direction to the tower, it took us long time to locate the plots.

2)It is hard to get the top leaf samples for some tall trees.
Even we got a ladder, but the ladder and pruner are not tall enough to sample leaves at the top of some tall trees. Consequently, we don't have sample leaves for some tall trees.

At the same time, we measured the tree locations with GPS.

When finished, it was around 6:00pm already. Besides samples for 18 oak trees, I also sampled one gray pines.

Around 8:00pm, we arrived home.

Around 9:30pm, I began to measure the leaf reflectance for all leaf samples with ASD spectroradiometer and weighted each samples. Each leaf samples are measured for ten times. After weighting, I transfer all samples into paper bags.


7/18/2003.

In the afternoon, I helped Jianwu to measure the CO2 flux for soil samples and we finished around 7:00pm

In the evening, I began to measure the leaf area for all samples in the lab. After done, I put all leaf samples in oven to dry it.

July 24, ppt in am in Oakland and Davis. Check the ranch

0 photos found

Graphs display:
16 sets found

No data found for TZ_Fenergy.
11 TZ_tmet graphs found

Explore the graph:Tonzi Tower Met: Temperature and Power in a new window

Explore the graph:Tonzi Tower Met: Solar Radiation in a new window

Explore the graph:Tonzi Tower Met: IRT Sensors in a new window

Explore the graph:LED Sensor Incoming in a new window

Explore the graph:LED Sensor Outgoing in a new window

Explore the graph:4-Band Solar Radiation in a new window

Explore the graph:Air Temperature Profile in a new window

Explore the graph:Relativity Humidity Profile in a new window

Explore the graph:Tonzi Tower PRI in a new window

Explore the graph:SRS PRI/NDVI in a new window

Explore the graph:SRS NDVI in a new window

No data found for TZ_soilco2.
Can't check TZ_mixed
3 TZ_mixed graphs found

Explore the graph:Tonzi PPT in a new window

Explore the graph:Tonzi CO2 and H2O Densities in a new window

Explore the graph:Air Pressure in a new window

No data found for TZ_fflux.
8 TZ_fmet graphs found

Explore the graph:Soil Heat Flux in a new window

Explore the graph:Tonzi Soil Temperature Set A in a new window

Explore the graph:Tonzi Soil Temperatures Set B in a new window

Explore the graph:Tonzi Soil Temperatures Set C in a new window

Explore the graph:Tonzi Soil Temperature Set D in a new window

Explore the graph:Well Level in a new window

Explore the graph:Well Water Temperature in a new window

Explore the graph:Soil Water Potential in a new window

No data found for TZ_tram.
No data found for TZ_co2prof.
No data found for TZ_irt.
No data found for TZ_windprof.
No data found for TZ_tflux.
2 TZ_sm graphs found

Explore the graph:Floor Solar Radiations in a new window

Explore the graph:TZ Soil Moisture in a new window

Can't check TZ_met
1 TZ_met graphs found

Explore the graph:Floor and Tower RH in a new window

Can't check TZVR_mixed
No data found for TZ_osu.
No data found for TZ_fd.