咸水滴灌补灌对土壤水盐分布和棉花产量的影响

Effects of Supplementary Irrigation with Saline Water under Drip Irrigation on Soil Water and Salt Distributions and Cotton Yield

通过田间小区试验，以不补灌为对照，研究成水滴灌补灌对棉花农田土壤水盐分布和产量的影响。结果表明，咸水滴灌补灌主要影响棉花对40-100cm土层水分的吸收，土壤水分动态受灌溉水盐分和降水的综合影响。在鲁北平原淡水灌溉出苗水的前提下，补灌1次矿化度在6g／L以下的成水不会造成棉花根系分布层土壤盐分的明显积累。成水滴灌补灌能明显增加棉花产量，增幅为15．7％-52．8％，增产幅度随着灌水矿化度的增加而降低。

Field experiments were carried out to research the effects of supplementary irrigation with saline water under drip irrigation on soil water and salt distributions and cotton yield with no-supplemental irrigation as the control. The results showed that supplemental irrigation with saline water under drip irrigation mainly had an impact on cotton absorbing soil water in 40-100 cm, and the dynamics of soil water were affected by irrigation water salinity and rainfall. After emergence water irrigated with fresh water in Northern Shandong plain, supplemental ir rigation once with mineralization degree below 6 g/L would not cause soil sah to be obviously accumulated in cotton root zone. Supplemental irrigation with saline water under drip irrigation could significantly increase cotton yield by 15.7 %-52.8%, and the increasing rate of yield decreased with the increase of mineralization degree of irrigation water.