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)

Abstract

Abstract. Riparian buffers can trap sediment and nutrients sourced from upper cropland, minimizing the eutrophication risk of water quality. This study aimed to investigate the distributions of soil inorganic phosphorus (Pi) forms among profile and particle-size fractions in an established riparian buffer and adjacent cropped area at the Dian lake, southwestern China. The Ca-bound fraction (62 %) was the major proportion of the Pi in the riparian soils. After 3 years' restoration, buffer rehabilitation from cropped area had a limited impact on total phosphorus (TP) concentrations, but has contributed to 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 cropped area; however, the Pi distribution between the cropped area and the buffer did not differ significantly as depth increased. The clay fraction corresponded to 57 % of TP and seemed to be both a sink for highly recalcitrant Pi and a source for labile Pi. The lower concentration of Pi forms in the silt and sand particle fraction in the surface soil was observed in the buffer area, which indicated that the Pi distribution in coarse particle fraction had sensitively responded to land use changes.

Soil phosphorus fractions in aggregate size classes in southwestern China

“…This study found that the average amount of TP (0–10 cm) in the Nitisols and Gleysols was up to 1.1 g/kg (Table ), which is several‐fold greater than that reported for the average topsoil TP level in the tropical and subtropical region of China (Zhang et al ., ). Our results also showed that the greatest portion of P was present in the calcium‐bound Pi fraction both of Nitisols and Gleysols in the region, which suggested that some of the soil's alluvial parent material probably originated from the limestone bedrock in the area above the catchment (Zhang & Li, ). Compared with Gleysols, Nitisols had greater amounts of calcium‐bound Pi on both an absolute and relative basis and smaller Po fractions on a relative basis.…”