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ABSTRACT
A hybrid anion resin was tested for in situ phosphorus (P) availability measurement in soils of two stands recovering from acidification and having different P-sorption characteristics. The phosphate (P-PO4) sorption capacity of the resin (before saturation) was 48 µmol g−1. Sorption and elution were tested under P-PO4 concentrations common in acidic soils (0–0.42 mmol l−1) either with or without the presence of sulfate (0.2 mmol l−1). The efficiency of P-PO4 sorption was independent of the sulfate and was 100 ± 0.2% (n = 56, ± SD). The P-PO4 recovery stabilized after six elution steps (each: 50 ml of 0.5 M sodium hydroxide, resin/solution 5:1). The efficiency of P-PO4 recovery was 80 ± 7% and was used to evaluate field measurements. We determined the amount of P-PO4 in the field using resin bags in three consecutive years. The results indicate that bioavailable P is negatively related to the soil ability to retain P.
Acknowledgments
We thank to Paul Sylvester for his advice about the resin, Gabriela Scott Zemanová and Ryan Ainsley Scott for the language corrections, and Jiří Bárta and Daniel Vaněk for the field assistance. We thank also the authorities of the National Park and Protected Landscape area, who enabled us to perform the measurements.
Funding
Financial support was provided by Czech Science Foundation (GAP504/12/1218, data evaluation).