不同改良剂对保护地次生盐渍化土壤改良效果的研究

研究旨在提高保护地次生盐渍化土壤肥力,探索建立适宜当地的次生盐渍化土壤改良模式。选择宿豫区典型保护地次生盐渍化土壤,以不施处理为对照,研究施用有机肥、土壤调理剂、米糠对土壤有机质、碱解氮、有效磷以及水溶性盐的影响。结果表明：各处理均能不同程度对次生盐渍化土壤进行改良,增加土壤养分,降低土壤含盐量。与对照相比,施用有机肥处理较对照土壤有机质、有效磷、速效钾分别提高41.6%、68.3%、121.6%,米糠处理较对照土壤有机质、速效钾显著增加41.4%、48.6%,土壤调理剂处理也有增加土壤有机质、碱解氮和速效钾含量的趋势。此外,各处理还对土壤水溶性盐分有降低效果。其中米糠处理较对照土壤电导率、水溶性盐总量、水溶性钙离子、水溶性镁离子、硫酸根离子含量分别显著降低43.3%、23.5%、28.9%、34.6%、23.2%。米糠、有机肥、土壤调理剂对次生盐渍化土壤改良效果依次递减,其中米糠改良效果较为显著。

Improvement Effects of Different Soil Amendments on Secondary Salinized Soil in Protected Field

To improve the fertility of the secondary salinized soil in the protected field and establish a suitable secondary salinized soil improvement model, the effects of applying organic fertilizer, soil conditioner and rice bran on soil organic matter, available nitrogen, available phosphorus and water-soluble salt were studied in Suyu. The results showed that all treatments could improve the secondary salinized soil and increase soil nutrients and reduce soil salt content. Compared with the control, the organic matter, available phosphorus and available potassium in the treatment of organic fertilizer were increased by 41.6%, 68.3% and 121.6%; the organic matter and available potassium in the treatment of rice bran were significantly increased by 41.4% and 48.6%; the organic matter, available nitrogen and available potassium were also increased in the treatment of soil conditioner. In addition, the treatments reduced the water-soluble salinity of soil as well. Compared with the control, the soil conductivity, total water-soluble salt, water-soluble calcium, water-soluble magnesium and sulfate ion in the treatment of rice bran were significantly reduced by 43.3%, 23.5%, 28.9%, 34.6% and 23.2%, respectively. The improvement effects of rice bran, organic fertilizer and soil conditioner on secondary salinized soil decrease successively, and the improvement effect of rice bran is more significant.