Soil and Plant Analysis for Forest Ecosystem Characterization by Vogt Daniel John Tilley Joel P. Edmonds Robert L

Author:Vogt, Daniel John,Tilley, Joel P.,Edmonds, Robert L.
Language: eng
Format: epub
Publisher: De Gruyter
Published: 2015-03-09T04:00:00+00:00

At equilibrium the ratio of the two isotopes in a portion of the solid phase is equal to their ratio in the solution, and the equilibrium constant equals 1 (e.g., Talibudeen [106]). Therefore, the 31P solid can be calculated from Equation (6.17):

(6.17)

The total P in the system that undergoes isotopic dilution has been termed labile 31P, or from Equation (6.17) it equals the sum of 31P solid and 31P solution [107].

Since available P is a functional concept rather than a measurable quantity, no simple direct measurements are available. However, depending upon the question being asked or the problem being solved, one can choose a method of analysis which may more closely represent the “available P” pool that the plants (or microbes) perceive under the given soil conditions.

Caution: Even small deviations from recommended procedures without careful evaluation may cause serious errors.

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