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针对甘肃白银碱化盐土质地黏重、透水性差、难以改良利用等瓶颈问题,在统一施用有机肥30 t hm-2的基础上,采用灌溉淋洗及施用脱硫石膏、糠醛渣进行改良。通过室内土柱入渗试验,研究施用改良剂对碱化盐土的入渗率、累积入渗量、湿润锋随时间的变化规律及盐分离子的影响。试验结果表明:改良措施对土壤入渗和盐分离子动态影响显著,在统一施用脱硫石膏30 t hm-2、糠醛渣7.5 t hm-2和有机肥30 t hm-2的条件下,处理后土壤任意时刻入渗率、湿润锋推进距离、累积入渗量与入渗时间呈幂函数关系;pH值、碱化度、全盐含量显著降低,Na+、CO32-、HCO3-含量显著降低。
Aiming at the bottleneck of sticky weight, poor water permeability, difficult to improve and utilization of Gansu silver alkaloids, Gansu Baiyin improved the leaching gypsum and furfural residue on the basis of uniform application of 30 t hm-2 organic fertilizer. Through indoor soil column infiltration test, the infiltration rate, cumulative infiltration rate, wetting front variation with time and influence of salt ions on alkalinity saline soil were studied. The results showed that the improvement measures had significant effects on soil infiltration and salt ion dynamics. Under the conditions of uniform application of 30 t hm-2 gypsum, 7.5 t hm-2 furfural residue and 30 t hm-2 organic fertilizer, The infiltration rate at any time, the advancing distance of wetting front, the cumulative infiltration capacity and the infiltration time showed a power function relationship. The content of Na +, CO32- and HCO3- decreased significantly in pH, alkalinity and total salt content.