Erosion risk map in a 2x2-meter grid (ERM2) | Carte à haute résolution du risque d'érosion au raster 2x2m (CRE2)
2011
Gisler, S. | Liniger, H. P., Centre for Development and Environment (CDE), NCCR North-South, Universität Bern, Bern (Switzerland) | Prasuhn, V.
The high-resolution erosion risk map (ERM2) of Switzerland's utilised agricultural area shows potential erosion risk based on the locational factors of relief, soil and precipitation _ irrespective of particular land use (arable land, permanent grassland or vines) or crop management. Areas at high risk of erosion within a plot or on a hillside, such as talwegs for example, are easy to identify on the map. Erosion damage mapping in the field, comparisons with other erosion risk maps and discussions with farmers have confirmed the validity of the map. Altogether, 44 % of the utilised agricultural area in the valley region was classified as a potential erosion risk on the basis of a 2×2-meter grid. 38 % of all the land in the valley region is used as permanent grassland, however, and to this extent poses no real erosion risk. A digital map of arable land is not currently available, so the land could not be broken down into arable and permanent grassland. ERM2 now provides a standard basis for assessing the potential erosion risk on plot scale for the whole of Switzerland. It enables farmers and cantonal advisors to identify in advance the land at risk of potential erosion, assess it jointly in situ and plan the requisite action. It remains essential, however, to carry out a field inspection of the erosion risk modelled.
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