Hi Steve,

I have done this extensively. Here's a paper that I published last year 
with some of my data:
*
*Teh, Y.A., Silver, W.L., Conrad, M.E. 2005. "Oxygen effects on methane 
production and oxidation in humid tropical forest soils." /Global Change 
Biology,/ 11, 1283-1297, doi: 10.1111/j.1365-2486.2005.00983.

If you'd like specific details of my methods and techniques, please feel 
free to contact me at the email listed in my signature.

Cheers
Yit

Steve Nelson wrote:
> If anyone has any experience/recommendations/references  for:
>
> 1) sampling soil gas for d13C, and
> 2) measuring pCO2 in situ
>
> I'd love to hear about it.
>

-- 
"...I do not believe totality can be contained in language; my problem is what remains outside, the unwritten, the unwritable. " - Italo Calvino, If On a Winter's Night a Traveller

Yit Arn Teh, Ph.D.
Postdoctoral Scholar
Rhew Laboratory
Department of Geography
507 McCone Hall
University of California
Berkeley, CA 94720-4740

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Office: (510) 643-6984
FAX: (510) 642-3370