Changs in the soil physical property and the topographic condition derived from
agricultural activities like as farming activities, land clearance and cutting down
resulted in environmental and economic problems including the outflow of nutrient from
farms and the water pollution. Several theories on the soil conservation have been
developed and reviewed to protect soil erosion in the regions having a high risk of
erosion. This study was done using the USLE model developed by Wischmeier and Smith
(1978),and model for the slope length and steepness made by Desmet and Govers(1996),
and Nearing (1997)to evaluate the potential of the soil erodibility. There, several results were obtained as follows.
First, factors affecting the soil erosion based on the USLE could be extracted to
examine the erosion potential in farms. Soil erodibility (K), slope length (L), and
slop steepness (S) were used as main factors in the USLE in consideration of the soil,
not by land use or land cover.
Second, the soil erodibility increased in paddy soils where it is low in soil content,
and the very fine sandy loam exists. Analysis of the slope length showed that the
value of a flat ground was 1, and the maximum value was 9.17 appearing on the steep
mountain. Soil erodibility showed positive relationship to a slope.
Third, the potential soil erodibility index (PSEI)showed that it is high in the PSEI
of the areas of steep upland and orchard on the slope of mountainous region around
Dokjigol mountain, Dunji mountain, and Deummit mountain. And the PSEI in the same land
cover was different depending on the slope rather than on the physical properties in
soil.
Forth, the analysis of land suitability in soil erosion explained that study area had
3,672.35ha showing the suitable land, 390.88ha for the proper land, and 216.54ha for
the unsuitable land. For unsuitable land, 8.71ha and 6.29ha were shown in fallow
uplands and single cropping uplands,respectively.