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Estimating landscape susceptibility to soil erosion using a GIS-based approach in Northern Ethiopia

International Soil and Water Conservation Research 2017年第3期5卷 221-230页

作者： Lulseged Tamene Zenebe Adimassu Ermias Aynekulu tesfaye yaekob International Center for Tropical Agriculture(CIAT) Chitedze Agricultural Research StationP.O.Box 158LilongweMalawi International Water Management Institute(IWMI) PO.Box 5689Addis AbabaEthiopia Agroforestry Center UN AvenueGigiriNairobiKenya Ethiopian Institute of Agricultural Research(EIAR) P.O.Box 2003Addis AbabaEthiopia

Soil erosion is a very critical form of land degradation resulting in the loss of soil nutrients and downstream sedimentation of water storages in the highlands of *** it is technically and financially impossible to conserve all landscapes affected by erosion,identification of priority areas of intervention is *** distributed erosion models can help map landscape susceptibility to erosion and identify high erosion risk *** of erosion models with geographic information systems(GIS)enables assessing evaluate the spatial variability of soil erosion and plan implementing conservation measures at landscape *** this study,the Revised Universal Soil Loss Equation adjusted for sediment delivery ratio was used in a GIS system to assess landscape sensitivity to erosion and identify *** approach was applied in three catchments with size being 10–20 km^(2) and results were compared against quantitative and semi-quantitative *** model estimated mean soil loss rates of about 45 t ha^(−1) y^(−1) with an average variability of 30%between *** estimated soil loss rate is above the tolerable limit of 10 t ha^(−1) y^(−1).The model predicted high soil loss rates at steep slopes and shoulder positions as well as along *** results of the study demonstrate that knowledge of spatial patterns of high soil loss risk areas can help deploy site-specific conservation measures.

关键词： Revised universal soil loss equation Sediment delivery ratio Hot-spot areas Watershed Sediment deposition

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