坡地果園山邊溝裸露溝面土壤流失量之研究

本研究自2017年4月~8月於國立屏東科技大學水土保持系戶外教室之坡地芒果園，選擇1.5 %、5 %、7 %、9 %、11 %、13 %等不同溝面坡降之初設山邊溝為試驗區，進行土壤沖蝕量觀測，以不同雨型探討裸露山邊溝溝面於不同坡降下之土壤沖蝕量探討，同時嘗試建立山邊溝於不同溝面坡降下之土壤沖蝕量與降雨量間之相關性分析，獲致結果如下:果園山邊溝之溝面坡降1.5%~5%，僅造成微量的水土流失，能有效的減少水土流失的情形，當山邊溝溝面坡降增至5 %，仍可有效地減少土壤沖蝕，而溝面坡降為7 %者於降雨量達35 mm時之土壤沖蝕量，與溝面坡降1.5%~5 %之土壤沖蝕量相似。

關鍵字

坡地果園；土壤沖蝕；降雨量；山邊溝

並列摘要

The mainly objective of this study was to realize soil erosion after created preliminarily hillside ditch with various longitudinal section slopes in slopeland orchard. The plot was a slopeland mango orchard, and located at the outdoor classroom of Soil and Water Conservation, National Pingtung University of Science and Technology. There were several slopes of longitudinal section on hillside ditch included as: 1.5 %, 5 %, 7 %, 9 %, 11 % and 13 %. The measurement was conducted from April to August, 2017. All the performance had shown as, there were small amount of soil loss within the slopes of longitudinal section on hillside ditch were 1.5%~5%, it means that could mitigate happening of erosion. The slope of longitudinal section was increased to 5% and then soil loss maintained still small amount. The soil erosion of slope of longitudinal section with 7% were similar to that of slopes with 1.5%~5% under 35 mm rainfall.