Transfer of phosphorus from small agricultural basins with variable soil types and land use

摘要: Three small rural basins in England with different soil types and farming systems were monitored from November 1994 to July 1998 determine the amounts, forms, timing pathways of diffuse phosphorus (P) transfer land runoff. Annual loads total (TP) measured two lowland one upland basin ranged up 4.2 1.4 kg ha -1 , respectively heavily dependent on flow. In all three basins, most P was transported particulate (PP) form during high flow rates winter when stream biological activity is low. However, comparison monitoring programmes also indicated elevated soluble under lower intensity storms. Monitoring individual field tile drains that much agriculturally derived. The amount needed generate greater, concentration runoff equivalent flows lower, grass than arable or mixed arable/grass cropping.