title: The use of 137Cs to establish longer-term soil erosion rates on footpaths in the UK.
abstract: There is increasing awareness of the damage caused to valuable and often unique sensitive habitats by people pressure as degradation causes a loss of plant species, disturbance to wildlife, on-site and off-site impacts of soil movement and loss, and visual destruction of pristine environments. This research developed a new perspective on the problem of recreational induced environmental degradation by assessing the physical aspects of soil erosion using the fallout radionuclide caesium-137 ((137)Cs). Temporal sampling problems have not successfully been overcome by traditional research methods monitoring footpath erosion and, to date, the (137)Cs technique has not been used to estimate longer-term soil erosion in regard to sensitive recreational habitats. The research was based on-sites within Dartmoor National Park (DNP) and the South West Coast Path (SWCP) in south-west England. (137)Cs inventories were reduced on the paths relative to the reference inventory (control), indicating loss of soil from the path areas. The Profile Distribution Model estimated longer-term erosion rates (ca. 40 years) based on the (137)Cs data and showed that the combined mean soil loss for all the sites on 'paths' was 1.41 kg m(-2) yr(-1) whereas the combined 'off path' soil loss was 0.79 kg m(-2) yr(-1), where natural (non-recreational) soil redistribution processes occur. Recreational pressure was shown to increase erosion in the long-term, as greater soil erosion occurred on the paths, especially where there was higher visitor pressure.
authors.affiliation: Department of Geography, University of Exeter, Amory Building, Rennes Drive, Exeter, Devon EX4 4RJ, UK. s.j.rodway-dyer@exeter.ac.uk
authors.forename: S J
authors.initials: SJ
authors.lastname: Rodway-Dyer
authors.forename: D E
authors.initials: DE
authors.lastname: Walling
mesh_terms: D002586:Cesium / Q000737:chemistry*; D002588:Cesium Radioisotopes; D003247:Conservation of Natural Resources; D004784:Environmental Monitoring / Q000379:methods*; D005843:Geography; D011847:Radioactive Fallout; D012987:Soil; D006113:United Kingdom
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D012987:Soil; D002586:Cesium