幾種土壤團粒促成劑影響土壤沖蝕性之研究

Abstract

為探究Polyvinyl alcohol（PVA），有機物（魯冰粉）與石灰（CaCO3）之施用，對土壤沖蝕性之影響，將不同質地之坡地土壤，即砂質壤土，壤土及粘土各加不同量之PVA（0.1%，0.2％及0.4%），風乾魯冰粉（0.2%，0.4％及0.6%）及純碳酸鈣（石灰需要量之1/3，1/2及全量），測各處理土壤之分散率，團粒安定度及水分滲透率， Upland soils of different textures, sandy loam, loam and clay, were treated with different amounts of polyvinyl alcohol (PVA: 0.1%, 0.2% and 0.4%), organic matter (air dried lupine powder: 0.2%, 0.4% and 0.6%) and lime (pure CaCO3: 1/3, 1/2 and total of lime requirements of the soils). The results of laboratory study on their effects on dispersion ratio, aggregate stability and initial hydraulic con-ductivity of the soils indicated that: