請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/34079
標題: Environmental Sensitivity Analysis and Recovery Efficiency at the Wasabi Cultivation in Alishan Forest Watershed
阿里山山葵園環境敏感區位分析及收回效益之研究
作者: Liu, Chia-Fang
劉佳芳
關鍵字: Wasabi
山葵
AGNPS
Environmental Sensitivity area
Vegetated Buffer Strips
GIS
Recovery Efficiency
農業非點源污染模式
環境敏感區位
植生緩衝帶
地理資訊系統
收回效益
出版社: 水土保持學系
摘要: 山葵是一種喜陰濕環境的十字花科多年生作物,通常栽植於高冷地之杉林下,因曾文水庫集水區內之阿里山地區頗適合山葵生長,截至2000年8月止,阿里山山葵種植面積已達約178.57ha。林地種植山葵之混農經營,其對水土資源污染之影響及其改善之道極為重要。本研究以集水區為分析單元,針對阿里山地區山葵園之空間分布,取樣分析土壤剖面污染源之分布與衰減,探討集水區環境敏感區位,利用農業非點源污染模式結合地理資訊系統,分析林地山葵園集水區之環境敏感區位及收回效益。 研究結果顯示陡峭區位山葵園收回對集水區泥砂產量並無顯著效益;野溪區位葵園收回以1號與8號集水區之效益較佳,泥砂產量分別減少為57.62%與19.28%;濱水區緩衝帶動態配置,各處理寬度之泥砂產量與野溪區位收回之處理差異不大。野溪配置40m寬植生緩衝帶之效益以5號與8號集水區較佳,泥砂產量分別減少為74.44%與69.41%。1號與8號集水區野溪區位之葵園面積25.12ha,約佔整個集水區葵園面積之17.32%,可於上述區位篩選一收回示範區,實際觀測山葵園之收回效益。 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.
URI: http://hdl.handle.net/11455/34079
顯示於類別:水土保持學系

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