Sedimentation in small constructed wetlands. Retention of particles, phosphorus and nitrogen in streams from arable watersheds

aquatic plants arable soils arcilla argile azote barrage bassin versant bioremediation clay conception cours d'eau cursos de agua dams design erosion escorrentia forecasting fosforo losses from soil modele modelos models motte de terre muestreo nitrogen nonpoint pollution noruega norway nutrientes nutrients perte par le sol phosphore phosphorus plantas protectoras plante aquatique plante de protection pollution by agriculture pollution diffuse pollution par l'agriculture protective plants represas rivers ruissellement runoff sampling sedimentation soil clods soil water retention sol arable substance nutritive suelos cultivables terre humide terrones velocidad velocity vitesse watersheds wetlands