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Phosphorus Dynamics in a Highly Weathered Soil as Revealed by Isotopic Labeling Techniques

^a Univ. of Adelaide, Soil and Land Systems, Glen Osmond, SA 5064, Australia
^b Inst. of Plant Sciences, Swiss Federal Inst. of Technology Zurich (ETH), Eschikon 33, CH-8315 Lindau, Switzerland
^c Berea College, CPO 2064, Berea, KY 40404, USA

View larger version (34K): [in a new window]   Fig. 1. Amount of P, recovery of 33P and relative specific activity (rel. SA) in (a–c) resin-extractable phosphorus (Presin) and (d–f) microbial phosphorus (Phex) after addition of 6 mg P kg–1 soil as plant residue or inorganic phosphorus (added Pi), both labeled with 33P, or after carrier-free labeling of isotopically exchangeable phosphorus (soil IEP) in soils with continuous maize (COM) and maize-crotalaria fallow rotation (MCF); bars show Tukey's honestly significant difference (0.05).

View larger version (35K): [in a new window]   Fig. 2. Source of microbial phosphorus (Phex) after plant residue amendment or addition of inorganic phosphorus (added Pi) in (a) soil from crop rotation continuous maize (COM) and (b) soil from crop rotation maize-crotalaria fallow rotation (MCF); error bars show SD of Phex in the respective treatment; dotted line indicates average level of Phex after carrier-free labeling of isotopically exchangeable soil P.

View larger version (33K): [in a new window]   Fig. 3. Recovery of 33P during sequential extraction of soils continuous maize (COM) and maize-crotalaria fallow rotation (MCF) after addition of 6 mg P kg–1 soil as plant residue or inorganic phosphorus (added Pi), both labeled with 33P, or after carrier-free labeling of isotopically exchangeable phosphorus (soil IEP). Resin-extractable phosphorus (Presin) determined separately; phosphorus extracted with resin membranes in the presence of hexanol (Pfum) and inorganic and organic phosphorus extracted with 0.1 M NaOH separated by acidification-centrifugation (NaOH-Pi and -Po) extracted sequentially. Bars show SD of the sum of 33P recovered in Pfum, NaOH-Pi, and Na-OH-Po.