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)