秸秆心土还田改良沼泽化土壤排涝效果的研究

Effect of Returning the Crop Stack into Subsoil on Improving The Marsh Bog Soil and Drainage

由于地势低洼、土质粘重 ,沼泽化土壤自身排水不畅 ,土壤内涝严重。“九五”期间 ,我们开展了向心土中施入秸秆的改土排涝试验 ,试验表明 ,表土位置不变 ,在 2 0～ 50cm心土内沟施或混施秸秆以后 ,第一年作物增产率为 - 5.6%～ 19.5% ;第二年为 1.4 %～ 13.7%。室内饱和透水测定结果说明 ,向心土混入秸秆以后 ,土壤透水能力提高。机械模拟处理区水分渗透速度约是对照区的10倍。

As a kind of low-lying clay soil, meadow boggy soils often suffer from excessive moisture. In order to improve its physical properties, a three-stage soil layer mixing plough was envisaged and designed, which can return the soybean stalk or wheat straw into the subsoil to achieve longer sustainability of drainage for the improvement of meadow boggy soil. The results of the manmade plots showed that the treatments with returning soybean stalks or wheat straws into the subsoil ditch, or mixed with the subsoil at the depth of 20～50 cm, meanwhile leaving the top soil undisturbed, gave a good performance on crop yields. The yield-increasing rate was -5.6～19.5% in the first year, and 1.4～13.7% in the next year. The saturated permeability of the soil in the manmade treatments was increased. The water permeability in the treatment tilled by the prototype plough was 10 times higher than that of the control.