Dataset Information


Speciation and sorption of phosphorus in agricultural soil profiles of redoximorphic character.

ABSTRACT: Controlled drainage is considered as a soil management tool to improve water supply to crops and reduce nutrient losses from fields; however, its closure may affect phosphorus (P) mobilization in soil. To assess the P mobilization potential, three soil profiles with redoximorphic features were selected along a slight hill in Northern Germany. Soil samples from three depths of each profile were characterized for basic properties, total element content, oxalate- and dithionite-extractable pedogenic Al, Fe and Mn (hydr)oxides, P pools (sequential extraction), P species [P K-edge X-ray absorption near-edge structure (XANES) spectroscopy] and P sorption behavior. In topsoil (~?10 cm depth), labile P (H2O-P?+?resin-P?+?NaHCO3-P) accounted for 26-32% of total P (Pt). Phosphorus K-edge XANES revealed that up to 49% of Pt was bound to Al and/or Fe (hydr)oxides, but sequential fractionation indicated that?>?30% of this P was occluded within sesquioxide aggregates. A low binding capacity for P was demonstrated by P sorption capacity and low Kf coefficients (20-33 [Formula: see text]) of the Freundlich equation. In the subsoil layers (~?30 and?~?65 cm depth), higher proportions of Al- and Fe-bound P along with other characteristics suggested that all profiles might be prone to P mobilization/leaching risk under reducing conditions even if the degree of P saturation (DPS) of a profile under oxic conditions was?


PROVIDER: S-EPMC7518995 | BioStudies | 2020-01-01

REPOSITORIES: biostudies

Similar Datasets

2018-01-01 | S-EPMC6262845 | BioStudies
2011-01-01 | S-EPMC3113541 | BioStudies
2020-01-01 | S-EPMC7288697 | BioStudies
2010-01-01 | S-EPMC2976553 | BioStudies
2020-01-01 | S-EPMC7599965 | BioStudies
2020-01-01 | S-EPMC7081404 | BioStudies
1000-01-01 | S-EPMC4446526 | BioStudies
1000-01-01 | S-EPMC4329151 | BioStudies
2020-01-01 | S-EPMC7386901 | BioStudies
1000-01-01 | S-EPMC5976659 | BioStudies