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Published online 21 June 2006
Published in Soil Sci Soc Am J 70:1349-1358 (2006)
DOI: 10.2136/sssaj2005.0300
© 2006 Soil Science Society of America
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A Comparison of Four Methods of Measuring Gross Phosphorus Mineralization

Laurie E. Kellogga,*, Scott D. Bridghamb and Danilo López-Hernándezc

a Dep. of Ecology, Evolution, and Behavior, Univ. of Minnesota, 100 Ecology, Saint Paul, MN 55108
b Center for Ecology and Evolutionary Biology, 5289 Univ. of Oregon, Eugene, OR 97403-5289
c Laboratorio de Estudios Ambientales, Instituto de Zoología Tropical, Facultad de Ciencias, Universidad Central de Venezuela, Apartado 47058, Caracas 1041-A,Venezuela


Figure 1
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  		Fig. 1. Specific activity for (a) bicarbonate-extracted Pi, (b) water-extracted Pi, and (c) Pm pool for all four soil types. Values are mean ± SD.

 

Figure 2
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  		Fig. 2. Concentrations for (a) bicarbonate- and (b) water-extracted Pi and (c) microbial P (Pm). Values are mean ± SD.

 

Figure 3
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  		Fig. 3. Concentrations of 32P for (a) bicarbonate- and (b) water-extracted Pi and (c) microbial (Pm). Values are mean ± SD.

 

Figure 4
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  		Fig. 4. E(t) for the sterilized incubations and the simulation model for three of the four soil types: (a) Histosol, (b) Entisol, and (c) Ultisol. Values are mean ± SD.

 

Figure 5
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  		Fig. 5. Fraction of added 32Pi found in the adsorbed pool in the sterile versus the nonsterile soil incubations with bicarbonate or water extractants in the four soil types: (a) Alfisol, (b) Histosol, (c) Entisol, and (d) Ultisol. Values are mean ± SD.

 




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