Phosphorus solubilization in rewetted soils

Changing climate and nutrient transfers: Evidence from high temporal resolution concentration-flow dynamics in headwater catchments

“…Withers and Hodgkinson (2009) also recorded high soluble reactive P and TP in low flow volumes entering an agriculturally dominated headwater stream during dry summer conditions. Higher P concentrations released to soil solution following drying and rewetting have been observed in laboratory experiments (Blackwell et al, 2009;Turner and Haygarth, 2001) and the same phenomenon may be what is observed here, similar to the flush of P observed after rewetting of soils after a dry summer (Dupas et al, 2015). Other outliers, with lower than expected event TP load for any given event rainfall could be attributed to exhaustion flushing of P when several events followed in quick succession (i.e.…”

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

“…For example, water-extractable phosphorus is markedly influenced by even mild drying of soil. It has been known for some time that soil drying can render considerable concentrations of organic carbon soluble in water [54] and a similar effect was recently reported for phosphorus in a wide range of pasture soils from England and Wales [55]. In the latter study, 7 days air drying from approximate field moisture capacity at 30 • C increased concentrations of water-extractable organic phosphorus by up to 1900%.…”

The phosphorus transfer continuum: Linking source to impact with an interdisciplinary and multi-scaled approach

“…These findings indicate that soil test P concentrations and the degree of saturation can be used to predict the risk of transfer by surface or subsurface hydrological flow paths. Other studies suggest that organic P has an important, but little understood role in determining solubilisation, especially in soils with low fertility (Chardon et al, 1997;Ron Vaz et al, 1993;Turner, 2005;Turner and Haygarth, 2001).…”