Field Notes

<--2002-11-06 15:25:00 | 2002-12-06 14:57:00-->

Tonzi/Vaira: 2002-11-14 13:30:00 (DOY 318)
Author: LiuKang Xu
Others: Jianwu

Summary: Soil respiration measurements, tower hmp fan dead, problems with Vaira key board, losing power at Vaira?

When: Nov 14, 2002 D318 Thursday.
Where: Tonzi/Vaira Ranches
Who: Liukang Xu & Jianwu Tang
Weather Sunny, temperature lower 60s

Trip Purpose: check 3 flux systems and download data, soil moisture probe reading, dendrometer reading, Jianwu did soil respiration measurements

Problem: The keyboard of laptop at Vaira seems to have some problems, I can not turn off the gillsonic.exe by punching alt+x, Ctrl+Alt+Del also didn’t work , I have to turn off the pc manually.

Overall: Floor flux system back to normal operation since Ted’s last visit on 11/6 (d310).

Fig_20021114a.png

Tower system running good. The fan for T/RH at the top of tower was broken, need to replace it. Vaira site, we started to miss some data (see the watchdog below), need talk to Ted. It is due to the solar power or something else?

Fig_20021114b.png

About 1/3 of oak leaves still hang on the trees after the last storm. Grass at both sites already started to germinate.

Tonzi Ranch: arrived at 1:30 pm. Clear sky, little windy temperature mid 60s.

Soil moisture reading:

Tonzi Vaira
7931AF 402165 574B4B 402FF3 57632 573FAA 7933FDE
11/14/2002 canopy canopy open drip line open open open
Xu tower understory solar panel sap flow resp trans solar panel flux tower
0 to 15 cm 21.70 19.40 31.50 14.70 27.03 11.87 13.27
15 to 30 cm 21.40 20.70 29.40 28.40 26.30 17.40 23.80
30 to 45 cm 14.53 10.50 13.93 13.43 4.43 15.37 17.07
45 to 60 cm 12.53 7.10 16.90 10.93 8.80 17.93 17.83

All data were averaged from three readings

Dendrometer reading: The oak trees expanded lot since the last storm.

date 11/5/2002 11/4/2002
jday
time_pst 0:00 14:50
treetag
tree71 6 10
tree72 7.7 9.6
tree77 11 13.7
tree78 20 20.3
tree79 7.9 11.2
tree245 3.7 5.6
tree248 5.5 9
tree250 5.7 10.6
tree252 11.3 15.4
tree255 6.5 9.7
ddb Xu

Floor system: flux system and fence working well. PVC reading 13.2, 2.9 and 2.4 at 2:30 pm. Battery fully charged. HD 0.97 GB left. After reboot laptop, flux program running properly.

mean std
w -0.15 0.143
u -0.25 7:39
v 0.12 0.197
Tsonic 27.31 0.18
Q 2.59 0.006
CO2 2.145 0.005

Note the high values of CO2 channel due to the recent rain and warm weather.

Tower system: fence OK. PV reading 13.4, 13.0 and 2.11 at 15:20. battery fully charged. HD has 2.4 GB left. After downloaded data, reboot PC, w, u, v, Tsonic, q and CO2 outputs on scale.

mean std
w 0.24 0.151
u -0.04 0.26
v 0.21 0.58
Tsonic 24.19 0.207
Q 1.934 0.037
CO2 2.065 0.028

Jianwu’s Notes

Soil CO2 profile measurements work well after a rain. The highest concentration reaches 5000ppm. I add three gortex sacs for them and hope they can survive the coming rains.

Soil respiration measurements read about 2 micro mol/m2/sec. The stem respiration has the similar reading.

In order to quantify the relationship of soil respiration between trees and non-trees, I installed more soil collars (6 collars) on ground, each with 1m apart. It seems soil respiration gradually decreases with the distance from the tree.

Vaira ranch: arrived around 4:00 pm, flux system and fence running well. PVC reading 12.9, 2.4and 2.4 at 4:30. 1.32 GB left on HD. All communication with data loggers is good. Download data and soil moisture reading.

mean std
w 0.06 0.138
u 0.33 0.31
v 0.92 0.286
Tsonic 19.93 0.093
Q 2.472 0.027
CO2 2.36 0.024

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.