不同灌水处理对盐渍土壤中玉米生长发育 及水盐热变化的影响

通过盐渍土壤盆栽玉米种植试验,对常规灌溉、固定灌溉、交替灌溉3种灌水方式下玉米的生长发育及水分、盐分、温度的变化情况进行了研究。结果表明:不同的灌溉处理对玉米生长发育及水分、盐分、温度变化的影响较大。株高和叶面积的长势是常规灌溉>交替灌溉>固定灌溉;生育期水分利用率和主根生长条数是交替灌溉>常规灌溉>固定灌溉,根冠比是交替灌溉>固定灌溉>常规灌溉;随着土层深度的增加温度呈减小的趋势,且对3种灌水方式都有A灌水水平的温度低于B灌水水平的温度;随着土层深度的增加体积含水率呈增大的趋势;由于蒸发和灌水交替进行,电导率在土层深度上呈现出多变的特点。

Effects of Different Irrigation Treatments on Corn Growth and Change of Water, Salt and Temperature in Saline Soil

In the method of pot cultivating, the corn growth and change of water, salt and temperature were studied in saline soil under normal irrigation, fixed irrigation and alternate irrigation. The results showed: It was prominent that the effect of different irrigation treatments on corn growth and change of water, salt and temperature. In the course of growth, plant length and leaf area of normal irrigation were the biggest, fixed irrigation were the smallest in 3 treatment; water use efficiency and taproot of alternate irrigation were the biggest, fixed irrigation were the smallest in 3 treatment; the ratio of root to crown of alternate irrigation was the biggest, normal irrigation was the smallest in 3 treatment; soil temperature was more and more low with the increasing of soil depth, and the temperature of A irrigation treatment was lower than B treatment ; volumetric water content was more and more high with the increasing of soil depth; because of the reciprocity of evaporation and irrigation, soil electrical conductivity was irregular with the increasing of soil depth.