【摘要】 通过室内均质土柱试验,以Br-为示踪剂,研究了90 mm/15 d和30 mm/5 d两种灌水频率下,1.7,1.2,0.8 m地下水埋深土壤中溶质(Br-)的运移规律。结果表明:不同地下水埋深或同一地下水埋深条件下,高、低灌水频率土壤中溶质运移快慢的趋势是变化的。地下水埋深由深变浅,高灌水频率土壤中溶质(Br-)运移由慢于低灌水频率逐渐转变为快于低灌水频率;高灌水频率土壤中Br-较集中地向下运移,低灌水频率土壤中地下水埋深越大,Br-分布越均匀分散;高灌水频率不利于土壤溶质(Br-)积聚于土表。更多还原

【Abstract】 Solute(Br-) transport in soils with 1.7,1.2 and 0.8m groundwater table(GWT) under 90mm/15d and 30 mm/5 d irrigation frequencies was investigated through disturbed soil columns in lab.Results show the downward tendency of solute transport changes in soils with different GWT or same GWT under high and low irrigation frequencies.Solute(Br-) transport rates in soils with high irrigation frequency is converted gradually which is from originally slower to quicker than the ones in soils with low irrigation frequency as GWT varies from deep to shallow.Br-movement in soils with high irrigation frequency is concentrated downward.Br-distributions in soils with low irrigation frequency become more uniform and wider as GWT get deeper.The accumulation of soil solute(Br-) at soil surface is abated by high irrigation frequency.更多还原