Hi Steve,
here are some references about soil derived CO2 sampling for d13C
analysis and the related theoretical background:

Bertolini T., I. Inglima, M. Rubino, F. Marzaioli, C. Lubritto, J.-A.
Subke, A. Peressotti, M. F. Cotrufo. Sampling soil-derived CO2 for
analysis of isotopic
composition: a comparison of different techniques.  Isotopes in
Environmental and Health Studies, Vol. 42, No. 1, 57–65 (2006)

K.E. Anders Ohlssona, Bhupinderpal–Singhb, Soren Holmc, Anders Nordgrena,
Lars Lovdahla, Peter Hogberg. Uncertainties in static closed chamber
measurements of the carbon isotopic ratio of soil-respired CO2. Soil
Biology & Biochemistry 37  2273–2276, (2005).

A.Amundson, L. Stern, T. Baisden,Y.Wang. The isotopic composition of
soil and soil-respired CO2. Geoderma, 82, 83–114 (1998).

THURE E. CERLING, D. KIP SOLOMON, JAY QUADE, and JOHN R. BOWMA. On the
isotopic composition of carbon in soil carbon dioxide. Geochimica and
Cosmochimica Acta Vol. 55, pp. 3403-3405 (1991)

If you would  like pdf copies as well as further details, please feel
to contact me.

Cheers
Teresa



On 7/6/06, Yit Arn Teh <[log in to unmask]> wrote:
> 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
>
> [log in to unmask]
> Office: (510) 643-6984
> FAX: (510) 642-3370
>



-- 
_______________________________
Teresa Bertolini
PhD

CNR ISAFoM
Via Patacca, 85
80056 Ercolano (Na)
[log in to unmask]
phone: +39 081 7717325 fax: +39 081 7718045