Have a look at this article, the main focus is on 13C signatures but it might still be useful to you:
Reservations about preservations: storage methods affect delta C-13 signatures differently even in closely related soil fauna
By:Krab, EJ (Krab, Eveline J.)[ 1 ] ; Van Logtestijn, RSP (Van Logtestijn, Richard S. P.)[ 1 ] ; Cornelissen, JHC (Cornelissen, Johannes H. C.)[ 1 ] ; Berg, MP (Berg, Matty P.)[ 2 ]
METHODS IN ECOLOGY AND EVOLUTION
Volume: 3 Issue: 1 Pages: 138-144
DOI: 10.1111/j.2041-210X.2011.00126.x
Published: FEB 2012
__________________________________________
Frida Keuper, postdoc
Climate Impacts Research Centre (Umeå university)
Abisko naturvetenskapliga station
Vetenskapens väg 38
901 07 Abisko
Sweden
Phone (work):+46 980 40 218
Phone (mobile):+46 72 739 75 52
________________________________________
From: Plants, Soils, Ecosystems [[log in to unmask]] On Behalf Of Peter Shaw [[log in to unmask]]
Sent: 30 July 2014 12:11
To: [log in to unmask]
Subject: Q about P,K, Mg analyses of stored soils
Dear All
I would value feedback on the way forward with getting chemical covariates for some soil faunal data (from Wisley, a sandy heathy soil). A PhD student collected soil cores for Tullgren extraction of fauna, then kept the dried (105C) soil samples at -20C, to get what chemical data may be obtained. We got pH at the time so that’s OK, and I’m not too worried about the LOI. We know that the handling has made determination of Nitrogen species simply worthless. The question is about analyses of P, K and Mg - whether to get total or extractable? One normally chooses extractable as this is more biologically meaningful, but the analytical lab queried whether extractable values would be worthwhile when the soil had been dried so hard. The alternative is getting total P, K and Mg, which I am confident will have changed little during drying and storage. The intention is to seek covariates to explain inter-sample and inter-plot differences, not to get exact determinations for nutrient budgets etc.
What do people recommend here? All thoughts welcomed.
Many thanks
Peter Shaw
Dr Peter Shaw
Reader in Zoology
Whitelands College, University of Roehampton
Holybourne Ave.
London SW15 4JD
+44 208 392 3457
Work page:
http://www.roehampton.ac.uk/staff/Peter-Shaw/
Personal Pages:
http://www.chezshaw.demon.co.uk/work/pjasacad.htm
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