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Riparian buffers can trap sediment and nutrients sourced from upper cropland,minimizing the eutrophication risk of water quality. This study aimed toinvestigate the distributions of soil inorganic phosphorus (Pi) forms amongprofile and particle-size fractions in an established riparian buffer andadjacent cropped area at the Dian lake, southwestern China. The Ca-boundfraction (62 %) was the major proportion of the Pi in the riparian soils.After 3 years' restoration, buffer rehabilitation from cropped area had alimited impact on total phosphorus (TP) concentrations, but has contributedto a change in Pi forms. In the 0–20 cm soil layer, levels of the Olsen-P,non-occluded, Ca-bound, and total Pi were lower in the buffer than the croppedarea; however, the Pi distribution between the cropped area and the bufferdid not differ significantly as depth increased. The clay fractioncorresponded to 57 % of TP and seemed to be both a sink for highlyrecalcitrant Pi and a source for labile Pi. The lower concentration of Piforms in the silt and sand particle fraction in the surface soil wasobserved in the buffer area, which indicated that the Pi distribution incoarse particle fraction had sensitively responded to land use changes

solid earth

Distribution of inorganic phosphorus in profiles and particle fractions of Anthrosols across an established riparian buffer and adjacent cropped area at the Dian lake (China)