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|標題:||Environmental Sensitivity Analysis and Recovery Efficiency at the Wasabi Cultivation in Alishan Forest Watershed|
Environmental Sensitivity area
Vegetated Buffer Strips
野溪配置寬度40m之植生緩衝帶，雖可顯著改善集水區泥砂產量至約70%，惟需收回44.32 ha，佔整個集水區葵園面積之 30.57%，因收回面積過大，在執行上有其困難。依現行法令，陡峭區位及濱水區等環境敏感區位應收回造林，阿里山陡峭區之山葵園皆分佈於濱水區環境敏感區位內，建議宜將野溪區位之山葵園約75.2ha分年分區收回造林，並詳加管理以防止葵農於環境敏感區位施作山葵，而衍生相關之水土保持問題。|
Wasabi (Wasabi Japonica Matsum), a cross-flowering and perennial plant, is usually cultivated under the fir forest in Alishan areas. Watershed of Tseng-Wen reservoir is suitable to grow Wasabi, and area of Wasabi plantation is already up to 178.57 ha in the watershed till August 2000. It's very important to understand the effect of Wasabi mix-cultivated with forest on the forestry watershed conservation.Watershed scale was used in this study for realizing spatial distribution and environmental impact of Wasabi plantation through the analysis of nutrient attenuation and environmental sensitive area in the watershed. The recovery efficiency of Wasabi cultivated at the environmental sensitivity areas and the placement efficiency of vegetated buffer strips were calculated by applying the linkage of GIS technology with AGNPS model. Results showed that the recovery of steep and/or gully site has the same benefit in sediment control with the dynamic vegetated buffer strips placement for safety depth 10m, 20m, and 30m along the riparian zone. Recovery efficiency of gully sites is about 57.62 % and 19.28 % in sediment reduction at the outlet of No.1 and No.8 sub-watershed. Placement efficiency of 40m-width riparian vegetated buffer strips is about 74.44 % and 69.41% in sediment reduction at the outlet of No.5 and No.8 sub-watersheds. There are about 25.12 ha (17.32%) of Wasabi cultivation located at the environmental sensitive areas of No.1 and No.8 sub-watershed. A field demonstration experiment is highly recommended for further detail observation in recovery efficiency of Wasabi cultivated at the site of gully. There are about 70 % sediment reduction efficiency at the scenario of 40m-width placement of riparian vegetated buffer strips for the No.5 and No.8 sub-watershed. The Wasabi plantation areas are up to 44.32 ha (30.57%) located at the site of above scenario, and are hardly to execute due to larger scale recovery. According to the related law and/or regulations, the site of steepness (slope>55%) and riparian should be protected for soil conservation. A total areas of 75.2 ha of Wasabi plantation located at the environmental sensitive areas should be recovery in sequence of zoning and/or timing consideration to prevent soil loss.
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