设施黄瓜膜下滴灌土壤中无机阴离子的运移和分布规律

试验在黄瓜定植后的不同时期分别从水平方向和垂直方向取土样并测定土壤中的无机阴离子含量,研究膜下滴灌方式下无机阴离子NO3-、SO42-和Cl-在土壤中的运移和分布规律。结果表明:在追肥时期,土壤中NO3-、SO42-和Cl-呈上升趋势,定植后40天测得土壤各层阴离子含量为整个生长期最高。定植40天以后不再向土壤中追施肥料,不同土层中的阴离子含量呈下降趋势。垂直方向,NO3-较快,最终3个土层中的NO3-含量基本相同;SO42-和Cl-开始下降幅度大,后变得缓慢。水平方向,距离滴头较远(10~15cm)土层中的阴离子含量较高。

Movement and Distribution of Anions in Cucumber Greenhouse Soil with Drip Irrigation under Film

Soil samples were got from vertical and horizontal directions in each section after the cucumber was planted.The content of soil anions was measured with different methods.The movement and distribution of NO-3,SO2-4 and Cl-were studied in drip irrigation soil under film.The results showed that the contents of NO-3,SO2-4 and Cl-were increasing during the fertilization time,and arrived at the highest after the cucumber was planted 40 days.The anions contents were decreasing when the fertilizer was not put into soil.The content of NO-3 reduced rapidly and its contents in the three soil levels were nearly the same finally.The contents of SO2-4and Cl-decreased fast at the beginning of growth,and then decreased slowly.The contents of anions were higher in the soil far away from the drip(10～15 cm) at horizontal direction.