碱茅属植物草地后作物地土壤盐分调控研究

The Studies on Controlling Soil Salt Contents for the After-cropping Rotation Following Establishment of Puccinellia Grassland

本试验结果表明，硫酸盐为主的盐渍地，种植碱茅属植物建植草地３年后，耕层土壤全盐的脱盐率达９４．７％，大部分盐分离子也大幅度降低。将３年生草地改种农作物后，后作物地耕层土壤中全盐和盐离子含量仍保持在３年生草地期水平，未发现明显积盐与回升。后作小麦与甜菜的产量达当地中产水平。种植碱茅属植物能将全盐量２．４０％以内的盐渍地改良为全盐含量为０．１３～０．１８％农业用他。可进行盐渍地─碱茅属植物（３年生）─农作物─草食家畜的草地农业模式化生产。

The studying results indicated that for three years after the establishment of Puccinellia Grassland on sulphate dominated Saline soil ,the salt content decline in cropping land soil has reached 94.7%,including alarge amount of reduction in salt ion for the most part,when the after crops were planted ,the total salt contents together with salt ion contained in the soil still maintained to a constant level in the three years’established pastureland,until then, not any significant salt accumulation was found.Wheat and sugar beets were the after crop plants,which had a medium level of productivity for the local.It was suggested by the authors that for establishing grassland, the planting of Puccinellia in this respect could improve the salinized soil with total salt contents lower than 2.40%,being equivalent to a mediuium productivity in cropping land with salt containts maintaining to only 0.13～0.18%in all,thus creating a certain socalled‘pratacultural Production Modelling,with the Puccinellia three years,grassland establishment-routine for cropping-domestic animal raising industry system as a fine example for future scientific study accordingly。