干旱区大田膜下滴灌对土壤盐分的影响

为研究干旱区大田膜下滴灌土壤盐分运移特征,在新疆石河子炮台试验站进行连续4年的试验研究。结果表明,膜下滴灌条件下,边行盐分偏高,棵间土壤盐分上升;耕作层土壤盐分下降,耕作层以下则增加,但由于滴灌灌水频繁,作物根系分布层内(0～40cm)土壤盐分始终处于较低值;利用膜下滴灌可以明显降低盐荒地土壤盐分,加速盐荒地改良和弃耕地的收复。

Influence of Drip Irrigation with Plastic Mulch on Soil Salinity of Cropland in Arid Regions

To study the characteristics of soil salt movement under drip irrigation with plastic mulch in arid regions,experiments for 4 consecutive years were carried out in Paotai Experiment Station in Xinjiang.The results showed that high salinity appeared in border rows and soil salinity between rows increased under drip irrigation with plastic mulch;salinity in arable layer decreased,but increased below the arable layer under different soils.However,due to the frequent drip irrigation,the soil salinity in the layer(0~40 cm) where crop roots spread was always low.Drip irrigation with plastic mulch could significantly reduce soil salinity of salt wasteland,accelerate the improvement of salt wasteland and recover the abandoned farmland.