A framework model for investigating the export of phosphorus to surface waters in forested watersheds: Implications to management.

摘要: The present study was developed in four sub-basins of rivers Cavado and Douro, located the North mainland Portugal. goal to identify main stressors as well driving attenuating processes responsible for presence phosphorus masses surface water those catchments. To accomplish goal, basins were selected where a quality station at outlet, forest occupation greater than 75% concentrations have repeatedly exceeded threshold good ecological status period 2000-2006. Further, two installed lotic (free-flow water) environment whereas other placed lentic (dammed environment. ArcMap GIS-based software package used spatial analysis processes. yields vary widely across studied basins, from 0.2-30 kg·ha(-1)·yr(-1). results point post-fire soil erosion hardwood clear cuttings leading factors exports watersheds, with precipitation intensity being key variable erosion. However, can be attenuated by sediment deposition along pathway burned or managed areas masses. observed high encompass serious implications resources management amplified cases potential release lake sediments especially during summer season. Therefore, number measures proposed regards wildfire combat, reduction after tree cuts, attenuation improvement riparian buffers, all purpose preventing go beyond regulatory status.