Effect of labile inorganic phosphate status and organic carbon additions on the microbial uptake of phosphorus in soils
Date
1981-05
Authors
Chauhan, B. S., author
Stewart, J. W. B., author
Paul, E. A., author
NRC Research Press, publisher
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Abstract
The effect of labile inorganic phosphate (Pi) status of the soil on the decomposition of added cellulose and on the immobilization, mineralization, and redistribution of native and added P in soils was studied in a greenhouse incubation experiment. Cellulose was added at 765 μg C∙g−1 soil with and without P (9 μg∙g−1 soil) every 30 days under adequate N, H2O, and constant temperature to two soils of different available P status. Lack of P eventually slowed down decomposition of added C, but this effect was partially compensated for by increased mineralization of organic P (Po) forms. Added P was redistributed to both P, (58–69%) and Po (42–31%) forms; higher amounts of Po were found in the soil with the highest Pi status. The correlation between microbial P uptake and solution P values was significant, and microbial C:P ratios ranged from 12:1 under high available P conditions to 45:1 where P was in low supply.
Description
Abstract in English and French.
Rights Access
Subject
soil
organic C
soil biomass
microbial P
lysing
P cycle