Measurement of \kur{in situ}Phasporus Availability in Acidified Soils using Iron-Infused Resin soils.

Mgr. Petr ČAPEK

Rigorózní práce

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 mol 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.

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 12. 10. 2016

Obhajoba závěrečné práce

• Obhajoba proběhla 14. 10. 2016

JIHOČESKÁ UNIVERZITA V ČESKÝCH BUDĚJOVICÍCH

Přírodovědecká fakulta

Rigorózní řízení / obor:
Biologie / Biologie ekosystémů