Gas sampling

June 30, 2006

Collected gas samples in all sites.



With Nathan, Coral and Ozden

Fig. 1 Gas sampling in JWB

Fig. 2 JWG site

Fig. 3 Gas sampling in LWB.

Fig. 4 LWG site

Fig. 5 RCF site

Fig. 6 Gas collecting in RCF

N mineralization experiment

July 27, 2006

Collected the buried bags which was installed April, 2006 in RWG, RWB and RCG and took out the soil from the bags.

Placed subsoil of the soil into bottles containing 100 ml 2M KCl and some subsoil transported to the lab and determined soil moisture.

Sampled 3 of 10cm intact soil cores in gas chambers of each site and placed it into poly-bags and buried again. Placed the subsoil into bottles containing 100ml 2M KCl and some subsoil transported to the lab to determine soil moisture.

Shanked the bottles about 1hr and allowed it to settle about 1hr and filterate the solution.

The solution was freezed and storaging in the freezer.

With Coral

Gas sampling

June 23, 2006

Collected gas samples in all sites.

A soil moisture sensor was broken in LWB site, so there is only one site (LWG) soil moisture data.


By Zack, Coral, Odzon, and Grant

C2H2 treatment previous experiment

June 22-23, 2006


Produced pure C2H2 gas from reaction of CaC2 and water.

Treated C2H2 10 K Pa to intact soil cores.

Sampled gas 3hr, 6hr, 12, 18hr and 24hr later after C2H2 treatment.



With Tom, Leigh Ann, and Nathan

Fig. 1 Materials for C2H2 gas producing- CaC2, 3 jars, 2 tubes, 1 gas bag and a syringe.

Fig. 2 Inserted C2H2 gas inside Mason jars containing intact soil cores (L=8cm, D=2cm).

Fig. 3 6 intact soil cores (0-10cm n=3, 90-100 cm n=3) treated C2H2 (10 K Pa) are incubated in room temperature (22oC).

Intact soil core sampling

June 21, 2006

Sampled intact soil cores (1 m depth, n=3) using a jack hammer and a jack in the first gas sampling point of John Risdal farm site.

Moved to lab and top 0-10cm and bottom 90-100 cm soils were seperated.

Put the seperated soil into Mason jars and storaged in the lab cooler.


With Leigh Ann, Zack, Grant and Coral

Ground water sampling

June 20, 2006

Collected groundwater for nitrate and dissolved nitrous oxide and measured pH of groundwater in site.

With Jessi and Paul

Gas sampling

June 15, 2006

We (Grant and Coral) collected gas samples in all sites.

Fig. 1 Ron Risdal North site (a crop field, a warm season grass filter and a woody buffer).

Fig. 2 Woody buffer in Ron Risdal North site.

How to measure the headspace of a bottle containning soil core?

June 13, 2006

Conduct pressure transducer test to know headspace volume using tubes (known volume) and made several equations to estimate headspace of bottles containning soil core.

Fig. 1 Tubes (known volume) and pressure transducers for the experiment to make equation - relation between haedspace and pressure change after adding air.

Gas sampling

June 8, 2006

Collected gas samples in all sites.


With Grant and Coral

Fig. 1 Warm season grass filter in Lonnie Strum farm site.

Fig. 2 Woody buffer in Lonnie Strum farm site.

Gas sampling

June 1, 2006

Collected gas samples in all sites.

With Jess, Coral and Nathan

Fig.1 Nathan in a crop field, trees in riparian area and cloudy sky.

Fig.2 Nathan is collecting gas sample in the crop field of Ron Risdal farm site.

Fig. 3 A warm season grass filter in John Risdal farm site.

Fig. 4 A woody buffer in John Risdal farm site.

Fig. 5 A woody buffer in Ron Risdal site.

Fig.6 A warm season grass filter in Ron Risdal farm site.

Fig. 7 A cool season grass filter in Ron Risdal site.

Fig. 8 Coral and Jess are collecting gas sample in the cool season grass filter in Ron Risdal site.

Gas sampling and montly inorganic N analyzing

May 25, 2006

Collected gas samples in LWB, LWG, JWB and JWG.

Sampled intact soil cores in all sites (5cm depth, 5 points x 3 replicates x 8 sites).

Put the sampled soil into the bottles containing 2 M Kcl extact solution.

Moved residual soils to lab and stored in 4oC for measuring soil moisture



With Zack and Jess

Test result of Dr. Loynachan's incubator

May 19, 2006

Downloaded temperature data from a data logger which was installed inside Dr. Loynachan's incubator.

Temperature data showed that the incubator keep 12~13 oC.

Fig. 1 Variation of air temperature inside Dr. Loynachan's incubator. The incubator are adjusted to about 13oC .

24hr gas sampling in riparian buffers and a crop field

May 18~19, 2006

Collected gas samples (3 replicates) and measured air temperature and soil temperature and moisture (soil depth 10cm, 3 replicates) every 3hr (10 am to next day 7 am).


* Sampling site
A woody buffer, a warm season and cool season grass filter and a crop field in Ron Risdal farm

* Time schedule for gas sampling (8 times)
10:00, 13:00, 16:00, 19:00, 22:00, 1:00, 4:00, 7:00

* Participant ( 4 persons)
Zack, Nathan, Grant, and Dong-Gill

Fig. 1 Gas sampling in the crop field (May 18, 13:00)

Fig. 2 Gas sampling in the crop field (May 19, 01:00 AM)

Fig. 3 Measuring soil moisture at soil depth 5 cm in the woody buffer (May 18, 13:00)

Fig. 4 Gas sampling in the warm season grass filter (May 18, 13:00)

Fig. 5 Collecting gas samples in the cool season grass fitler (May 18, 13:00)

Checking an Incubator and groundwater sampling

May 17, 2006

Installed a temperature data inside an incubator of Dr. Loynachan to check the incubator abaility to keep constant temperature (13~15 0C).

Collected ground water samples for dissolved N2O analyzing in Ron Risdal North and South sites.


Wiht Dr. Tom Loynachan, Jenny and Jessi

Fig. 1 Installed one data logger to check inside temperature variation.

Reinstall anchors, a data logger and mesh bags

May 16, 2006

1. Reinstalled 5 anchors, a data logger with a soil moisture sensor and a soil temperature sensor (5cm soil depth) and 15 mesh bags containing soybean residuals. GPS helped to find original spots where the anchors were located before we removed them.

2. Downloaded rain data from a rain guage data logger in Ron Risdal farm and then changed batterires of the rain guage data logger.


With Zach and Grant

Fig. 1 Crop field in Ron Risdal farm (before reinstalling)

Fig. 2 Find installing points using GPS unit

Fig. 3 Install a data logger with a soil moisture sensor and a soil temperature sensor

Fig. 4 Installed an anchor and mesh bags containing soybean residuals

Fig. 5 Crop field after reinstalling

Fig. 6 Downloaded rainfall data in Bear Creek

Fig. 7 Great job MEN!! (Left, zack; right, Grant)

N decomposition experiment_drying step

May 8, 2006

Took out all decomposed materials from mesh bags and dried at a oven (75oC).

* samples information

5 above ground vegetation samples from each of RWG, RCG, RWB
5 soy bean residues samples from RCF
5 litter fall samples from RWB
3 root samples from each of RWG, RCG, RWB

with Zack

Fig. 1 Take out decomposed materials (fine roots) from a mesh bag.

Fig.2 Put the materials (fine roots) on weigh dishes.

Fig. 3 Put the materials (above ground vegetation) on weigh dishes.

Fig. 4 Dry at a electric oven (75oC) for 48hrs.

Gas sampling

Apirl 28, 2006

Collected gas samples in JWB and JWG.



With Lindsey and Phil

Fig. 1 A woody buffer in Jon Risdal farm (JWB)

Fig. 2 A warm season grass filter in John Risdal farm (JWG)

Gas sampling

April 27, 2006

Collected gas samples in LWB, LWG, RCG, RWB and RWG.

with Lindsey and Phil

Fig. 1 A warm season grass filter in Ron Risdal farm (RWG)

Fig.2 A cool season grass filter in Ron Risdal farm (RCG)

Fig. 3 A woody buffer in Ron Risdal farm (RWB)

Fig. 4 A crop field in Ron Risdal farm (RCF)

Groundwater sampling for dissolved N2O gas

March 24, 2006

Collected groundwater samples (10ml, 3 replicates) and storaged in the He evacuated vials (20ml, 4oC) in North and South Ron Risdal farm site.

With James Gilbert

Gas sampling and collecting litter and root bags

April 20, 2006

Collected gas samples in all sites but a crop field.

Collected litter and root bags in a woody buffer, a warm season grass filter and a cool season grass filter in Ron Risdal farm.

Fertilizers were sprayed in a crop field and tilled again.




With Lindsey and Andy


Fig.1 Andy is collecting gas sample in cool season grass fitlter, Ron Risdal farm.

Fig. 2 A litter bag (buried last fall) was collected in cool season grass fitler, Ron Risdal farm.

Fig. 3 A root bag (buried last fall) was collected in cool season grass fitler, Ron Risdal farm.

Fig. 4 Fertilizers were sprayed in a crop field, Ron Risdal farm.

Fig. 5 A trator is tilling in crop field after sparying fertilizers