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Assessment of Arable Soil Erosion Risk in Seonakdong River Watershed using GIS, RS and USLE  

Ko, Jee-yeon (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Lee, Jae-saeng (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Jung, Ki-yul (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Yun, Eul-soo (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Choi, Yeong-dae (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Kim, Choon-shik (National Institute of Crop Science, Yeongnam Agricultural Research Institute)
Kim, Bok-jin (School of Biological Resource, Yeungnam University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.39, no.3, 2006 , pp. 173-183 More about this Journal
Abstract
Purpose of this study was to estimate of soil erosion, which is related with crop productivity and water quality in watershed, in Seonakdong river watershed using USLE. The data set for USLE estimation were derived from detailed digital map(K factor), satellite imagery(C and P factors) and DEM(LS factor). The R factor was calculated by AWS data from Kimhae agricultural technology center. The soil loss from arable land was equivalent of 31.5% of total soil loss in Seonakdong river watershed. The soil loss amount of paddy field and upland were 2.8% and 97.2% of arable land, respectively, even in the area where paddy field was occupied much largely as 76.3%. The reason of large amount of soil loss from upland was that 30.4% of upland was distributed at "severe" and "very severe" soil erosion grade in watershed. The distribution of soil erosion grade during cropping season(May-Sept.) was similar to the annual soil loss. Soil erosion of non-cropping season(Oct.-Apr.) was small due to a low R factor. But, soil erosion grade of near mountain footslope areas showed severe and very severe even in non-cropping season.
Keywords
Soil erosion; USLE; GIS; RS; Seonakdong river watershed;
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