论文部分内容阅读
应用土壤入渗性能自动测量装置,采用无压点源入流测量方法,在4种不同水质条件下(蒸馏水;钠吸附比为5(mmol/L)0.5,电导率分别为2.5、5.0、10.0ds/m),研究灌溉水矿化度对盐碱土壤入渗性能的影响规律。结果表明:1)点源入流方法可以避免雨滴打击以及快速湿润土壤所引起的土壤物理结构破坏,完整地测量出灌溉水质单因素下的土壤入渗率。2)提高灌溉水的矿化度可以增加土壤入渗能力,但随着灌溉水矿化度的增加,土壤入渗能力提高的速率逐渐降低。3)入渗初期,最大湿润深度和累积入渗量均随时间呈幂函数增长,随着入渗趋于稳定二者均随时间近似呈直线关系增长,且最大湿润深度和累积入渗量均随着矿化度的提高而增加。4)连续入渗4h后,3种含盐水的累积入渗量均大于蒸馏水,最多约达蒸馏水的2倍。试验结果对盐碱地水盐管理具有指导意义。
Under the four different water quality conditions (distilled water; sodium adsorption ratio of 5 (mmol / L) 0.5, conductivity of 2.5, 5.0 and 10.0 d, respectively) were applied to measure soil infiltration performance automatically. / m) to study the effect of irrigation water salinity on the infiltration capacity of saline soils. The results show that: 1) The method of point source inflow can avoid the raindrop strike and soil physical structure damage caused by rapidly wetting soil, and measure the soil infiltration rate under single factor of irrigation water quality completely. 2) Increasing the salinity of irrigation water can increase the infiltration capacity of soil, but with the increase of salinity of irrigation water, the rate of soil infiltration capacity gradually decreases. 3) At the initial stage of infiltration, both the maximum depth of wetting and the cumulative infiltration increased exponentially with time, both of them increased linearly with time as the infiltration tended to be stable, and both the maximum wetting depth and the cumulative infiltration With the degree of salinity increased. 4) After 4h of continuous infiltration, the cumulative infiltration capacity of the three kinds of salt-containing water is larger than that of distilled water, up to about twice as much as that of distilled water. The result of the experiment is instructive to the management of salt and alkali water and salt.