Phosphate oxygen isotope ratios in vegetated riparian buffer strip soils

The oxygen isotopic composition of phosphate (?18OP) in soils and surface water bodies has been used to trace terrestrial P inputs into aquatic ecosystems. However, enhanced biological activity vegetated riparian buffer strips (VBSs) may lead an alteration ?18OP values. objective this study was assess whether cycling VBS can be identified using For purpose, we sampled temperate grassland at various depths along a transect. Here, combined sequential soil extracts with analysis Soil pool concentrations tended decrease significantly the transect from soils; strength relationship varied extract, sample depth, inorganic or organic bonding form. values 1 M HCl-extractable observed significant negative trend transect, indicating tendency for accelerated rates within profile compared upslope soils. We conclude that isotope-based assessments source contributions freshwater should consider turnover