陡坡地果園土壤沖蝕量及保育方法之研究(四)

Abstract

本研究包括二個試驗：(一)坡地土壤沖蝕量推估之研究；(二)陡坡地覆蓋作物對土壤性質及水土流失影響之研究，本年度試驗結果列述如下： 1.以人工模擬降雨裝置，模擬不同之降雨強度、坡度及延時下，探討敷蓋處理對逕流與沖蝕所產生之機制及對逕流及土壤沖蝕所產生的影響。證實逕流率隨降雨強度及延時、坡度的增加而增加，在坡度55%時降雨強度100mm/hr，延續50分鐘後達到最大之逕流率(30.2%)而土壤沖蝕卻只在不同強度及坡度下第一次採樣中，有少許之土壤外，均未再發現有土壤沖蝕發生。 The purpose of this study is to find out the soil losses and soil conservation practices for the steep slopeland orchard. The results obtained are summeriged as follows: 1.The first experiment was carried out under rainfall simulator factility with different intensity of precipitations, degree of slops and delay condition. The mechanism and effectiveness of runoff and soil erosion under mulching treatment condition were investigated. The results indicated that the rnoff trat was going up according to the increase of intensity of preciptation, delay and degree of slope.