几种牧草对河西走廊盐渍化土壤改土培肥的效应研究

在河西走廊盐渍化土地上种植老芒麦、扁穗冰草、碱茅和紫花苜蓿4种优质牧草,对盐渍化程度均有一定的改良效果.其中碱茅对盐渍化土壤的改土培肥效果最好,建植3年后的碱茅,与对照比较,0～20 cm土层中自然含水量增加125.99 g/kg,总孔度增加16.14%,容重降低0.27 g/cm3,pH值由8.43降到8.10,全盐含量降低52.90 g/kg,脱盐率达到76.12%,有机质增加3.67 g/kg,碱解氮含量增加18.63 mg/kg,速效磷和钾亦随之增加.

The effects on forage to ameliorate and fertilize saline-alkali soil in the Hexi area

After planting the forage species: Elymus sibiricus,Agropyron cristatum,Puccinellia spp.and Medicago sativa,significant soil amelioration and fertilizing effects were shown to occur in the saline-alkali soil of the Hexi area.The effects of alkali-grass was shown to be significant,as after P.spp.had been established for 3 years,the pH value of the soil profile at 0-20 cm decreased from 8.43 to 8.10,and the total salt content decreased by 52.90 g/kg.Further,the desalinization ratio reached up to 76.12%,the soil organic matter increased by 3.67 g/kg,available N increased by 18.63 mg/kg,and further,there were also significant increases in both available P and available K.