One rainfall event exceeded the highest maximum precipitation probability (750 mm) for a 500 yr period. After this event, changes in soil properties, including macro morphological and physical characteristics, were observed at the research sites, including fire-damaged forest areas. Soil erosion, burying, and flooding were observed after this storm.
Similar amounts of soil loss were observed between estimated and measured values for erosion events of grades 2-4. For a grade 5 erosion event (land slide), the measured soil loss was significantly higher than the estimated soil loss. Severe soil loss was found at lower soil-depths, greater slopes, longer slope lengths, and concave landscapes. Land slides were often found at areas having coarser textures, higher bulk densities, lower water retention contents, and lower rates of soil aggregation. Crop growth stagnation was found at the forest restoration site because of lower soil fertility and poor drainage caused by the abrupt textural changes. In conclusion, steep-slope agricultural areas are easily eroded, and need to be managed carefully.
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