【摘要】 通过室内试验测定新疆昌吉地区盐碱土在不同滴灌施钙时间的入渗运动过程,研究不同施钙时间(前期施用Ca-W、后期施用W-Ca、中间施用W-Ca-W、前后期施用Ca-W-Ca)的盐碱土土壤盐分运移和水分运动。结果表明不同施钙方式对滴灌盐碱土土壤水分分布具有影响,对盐碱土盐分运移影响明显,随着湿润锋水平、垂直运移距离的增加,不同滴灌施钙方式的土壤含盐量、钠离子含量和钠吸附比均在不断增加,Ca-W-Ca方式的达标脱盐区评价系数和脱钠区深度系数均大于其他方式,钠吸附比均小于其他方式,脱盐效果均优于其他方式,说明Ca-W-Ca方式更有利于作物根系生长,改良盐碱土效果最明显。更多还原

【Abstract】 Based on indoor experiments,the movement of soil water in drip irrigation was measured in saline-alkali soil of Changji region in Xinjiang province for different drip irrigation calcium-using time.Soil water movement and salt transport in saline-alkali soil for different drip irrigation calcium-using time(in the beginning of the irrigation cycle(Ca-W),at the end(W-Ca),in the middle(W-Ca-W),and in the beginning and end of the irrigation cycle(Ca-W-Ca)) were studied.The results show that distributions of water in soil is influenced for different calcium-using modes.The salt transport of saline-alkali soil is significantly influenced for different calcium modes.With the increase of the horizontal and vertical advance distance of soil wetted front increasing,soil salinity and sodium content and sodium absorption ratio increase for different calcium treatments in drip irrigation.Coefficients of controlled desalinization zone and the depth of the sodium desalinization zone coefficients of Ca-W-Ca mode are higher than that of other modes,but the sodium absorption ratio of Ca-W-Ca mode is less than that of other modes,and the desalinization effect of Ca-W-Ca is also superior to that of other modes.It can be concluded that the crop root grow better in the Ca-W-Ca mode and improvement effect of saline-alkali soil of this mode superior to that of other modes.更多还原