Effect of parent materials and land use on soil phosphorus characteristics in Southern Belgium

摘要: Appropriate management of soil phosphorus fertility should rely upon sound knowledge about phosphorus (P) reserve and bioavailability. The fate of P in the soil-plant-water system depends on both soil characteristics and agronomic practices. The evaluation of soil P compartments can be a tool for the assessment of P susceptibility to migrate to other compartments of ecosystems. In this study, twelve parent materials were selected according to their spatial representativity. Surface (0-25 cm) and deeper (80-120 cm) horizons have been sampled in ten crop or pasture fields for each parent material. Total (HNO3+ HClO4+ HF), inorganic (H2SO4), organic (Total minus inorganic) and available (CH3COO-NH4+ EDTA) P pools were measured in the laboratory.A large range of P content was observed among results under significative influence of both parent material and land use. Evidence of parent material influence was found for surface as well as deeper horizons for available, total, organic but also inorganic P. Highly significative differences have been shown for these parameters. As a result, a North-South gradient can be observed in Walloon Region.