浅埋滴灌不同灌溉定额对玉米田土壤盐分运移的影响

Effects of Different Irrigation Quotas on Soil Salt Transport in Maize Field under the Shallow Buried Drip Irrigation

2019-2020年,设传统畦灌常规灌量的40%(W1)、50%(W2)、60%(W3)3个灌溉定额,在西辽河平原研究玉米浅埋滴灌下灌溉定额对0~60 cm土层土壤盐分分布的影响。结果表明,玉米浅埋滴灌下0~10 cm土层土壤盐分含量,随着灌溉定额的增加而降低,随着生育时期的推移处理间差异逐渐增大。垂直滴灌带方向,距离滴头25 cm处,处理间差异均达到显著水平;平行滴灌带方向,在两个滴头中间,W1与W2、W3处理间差异均达到显著水平。土壤盐分垂直分布,0~30 cm各土层随着生育期的推移呈先升高再降低趋势,随着灌溉定额的增加而降低;40 cm以下土层随着灌溉定额的增加而升高。玉米浅埋滴灌下,30 cm以上土层盐分容易上移至地表聚集,增加灌溉定额使表层盐分水平方向上运移更远,垂直方向上运移更深。

The effects of irrigation quota on soil salt distribution in 0-60 cm soil layer under shallow buried drip irrigation of maize were studied in Xiliaohe plain between 2019 and 2020,the irrigation quotas were established at 40%(W1),50%(W2)and 60%(W3)of the conventional border irrigation amount.The soil salt content in 0-10 cm soil layer under shallow buried drip irrigation decreased with the increase of irrigation quota,and the differences between treatments increased with the development of growth period.In the vertical direction of drip irrigation belt,the difference between treatments reached a significant level at 25 cm away from the drip head.In the parallel direction of drip irrigation belt,the difference between W1,W2 and W3 reached a significant level in the middle of two drops.In the vertical direction of soil salt distribution,the content of soil salt in 0-30 cm soil layer increased first and then decreased with the increase of irrigation quota,and the content of soil salt in soil below 40 cm soil layer increased with the increase of irrigation quota.Under shallow buried drip irrigation,the salt in the soil layer above 30 cm tended to migrate upward to the surface and accumulate.Increasing irrigation quota caused the surface salt to migrate further in the horizontal direction and deeper in the vertical direction.