Phosphate sorption in aluminum- and iron-rich humus soils

摘要: Groundwater discharge areas in boreal forest ecosystems can potentially be where Fe and Al accumulate the floor affect solubility of P. This study was conducted to determine phosphate sorption properties using humus soils containing high native amounts Fe. Humus were collected from two different forested groundwater varying pH amount distribution At species. The capacities 265 216 mmol P kg(-1) dry wt. soil, respectively, for soils. Pyrophosphate extractable dominated first 738 concentration pyrophosphate second soil 317 wt.. whereas citrate-dithionite (CD) extracted 548 Using 0.1 mol dm(-3) NaCl as ionic medium gave a higher compared with deionized water at midrange additions, but no difference highest addition. Phosphate independent when used, minimum approximately 6. Dissolved organic carbon (DOC) release solution positively correlated sorption, especially medium. However, dissolved (DOP) unaffected by sorption. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) indicated that precipitation phosphates additions mainly organically bound Fe, both surface occurs larger CD-extractable