Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33527
標題: 阿公店水庫集水區植生緩衝帶配置之研究
A Study on the Vegetated Buffer Strips at A-Kung-Ten Reservoir Watershed
作者: 王小燕
Wang, Shao Yunn
關鍵字: Vegetated Buffer Strips;植生緩衝帶;A-Kung-Ten Reservoir Watershed;Agricultural Nonpoint Source;阿公店水庫集水區;農業非點源模式;泥岩
出版社: 水土保持學類
摘要: 
Mudstone is one of the problem soils regarding soil
and water conservation in Taiwan. The components of soil
texture in mudstone area are mainly silt and/or clay
which result in poor infiltration and soil erosion occurs
frequently at the bare slopeland in the area. Vegetated
buffer zones need to be established as a Best Management
Practice(BMP) for water quality improvement in
agricultural areas. This study is to find out the optimal
width and placement of vegetated buffer strips by
applying the linkage of GIS technology with AGNPS model in
A-Kung-Ten reservoir watershed which locates at
mudstone areas.
A lower NDVI sub-watershed is extracted from the
watershed to further study. Placement of vegetated buffer
strips at the areas with low NDVI and no more than 30%
slope, a 80% of sediment yield from upland could be
decreased and a maximum placement efficiency of 7.8
tons/ha can be expected. However a 18.52% of sediment
yield decreased and 9.6 tons/ha maximum placement
efficiency is derived at the areas of slopes which ranges
from 30% to 60%. As far as bare steeplands (greater than
60%) are concerned, it is not necessary to set up the
buffer strips at the places of slope changes abruptly
because of high NDVI in the places already.
A 40m width of riparian buffer strips will be enough at the
areas of slopes less than 30%, and topographic maps with
larger scale are needed if try to find out the economical
width. The plain areas are the right places for placement
of riparian buffer strips because there is no significance
of placement efficiency at the areas of slopes range 30%
to 60%.

泥岩為台灣水土保持問題土質之一,其質地細緻、入滲率差 ,裸露
之坡面易受沖蝕,集水區內配置植生緩衝帶改善水質為最 佳管理措施之
一。本研究以農業非點源污染模式(AGNPS) 配合 地理資訊系統,分析
泥岩分布區阿公店水庫集水區植生緩衝帶之 最適配置寬度及抑砂效果。
經萃取阿公店水庫集水區常態化差異植生指數(NDVI)較低之 子集水
區做進一步研究,於平均坡度小於30% 處配置植生緩衝帶 後,坡面之泥
砂產量減少率約為 80%,配置效益為每公頃最大可 減少7.8公噸,而平
均坡度介於30%~60%之地區,配置後之泥砂產 量減少率則為 18.52%,配
置效益為每公頃最大可減少9.6公噸。 唯平均坡度大於 60%之陡坡裸地
,由於植物已能於配置區內自然 入侵生長,已毋需於坡度劇烈變化點處
設置植生緩衝帶防堵泥砂 。
溪流濱水區植生緩衝帶之配置結果顯示平均坡度小於30%之地 區,只
需配置40m之緩衝帶寬度即已足夠,由於分析網格之解析度 為 40m×40m
,若欲找出最經濟之配置寬度,宜採用較大比例尺之 地形圖進一步分析
;平均坡度介於30%~60%之地區,配置效果並不 顯著,故濱水區植生緩衝
帶之配置宜以緩坡地為主要考量。
URI: http://hdl.handle.net/11455/33527
Appears in Collections:水土保持學系

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