Abstract
Organic phosphorus (OP) serves as a significant pool of phosphorus (P) in Ferrasol, and OP adsorption strongly affects soil P bioavailability and mobility. However, little is known on how OP adsorption is affected by P accumulation, which occurs in many ferrasols. Here, we examined the adsorption characteristics of representative compounds of seven P forms on ferrasol with and without P accumulation by conducting adsorption experiments followed by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and selective extraction. Four OP compounds (2-phosphonobutane-1, 2, 4-tricarboxylic acid [PBTCA], β-glycerol phosphate [BGP], DNA, and adenosine 5′-triphosphate [ATP]) and three inorganic P compounds (disodium hydrogen phosphate [OrthoP], tetrasodium pyrophosphate [TSPP], and sodium tripolyphosphate [TPP]) were used to represent phosphonates, monoesters, diesters, organic polyphosphate, orthophosphate, pyrophosphate, and inorganic polyphosphate, respectively. Ferrasol strongly adsorbed all seven P compounds with the adsorption capacity being ranked in order as follows: PBTCA > BGP > OrthoP and TPP > ATP, DNA, and TSPP. Oxalate-extractable iron (Feox) and aluminum (Alox) positively correlated with the adsorption of BGP, OrthoP and PBTCA and were conducive to Fe/Al-bound P in ferrasols as evaluated by selective extraction. Soil total P had no significant relationship with P adsorption capacity, but P accumulation reduced the adsorption capacity of ATP and TPP. In contrast, Ca had a greater effect on the increase of the adsorption of PBTCA, BGP, DNA, TSPP, and ATP. FT-IR and XRD analysis showed that kaolinite may contribute to the adsorption of all seven P compounds while montmorillonites and quartz were the primary minerals for the adsorption of BGP and DNA, respectively. It can be concluded that the effect of P accumulation is less pronounced than the soil physicochemical properties in ferrasol.
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