不同改良剂对滨海盐渍土水盐特性的影响

针对滨海盐渍土盐分含量高和土壤导水性能差的问题,采用禾康盐碱土改良剂、康地宝盐碱土改良剂、金满田生物菌剂、腐殖酸和石膏5种土壤改良剂,通过田间小区试验,分析测定了土壤含水量、土壤盐分含量、pH值、容重和饱和导水率等指标,并测定了作物收获产量,筛选适宜于改良研究区滨海盐渍土水盐特性的改良剂.试验结果表明:(1)土壤水分含量变化极大地影响着土壤的含盐量,土壤含水量与土壤含盐量呈极显著线性负相关关系.(2)腐殖酸在抑制滨海盐渍土盐分和降低土壤容重方面效果最佳,经腐殖酸(300 kg/hm2)处理后,0-5,5-20和20-40 cm土层盐分含量较CK分别减少了29.2％,32.6％和25.9％,土壤容重较CK减少了10.2％,土壤孔隙度和饱和导水率较CK也相对提高.(3)5种改良剂不同程度提高了作物的产量,以腐殖酸处理作物增产效果最为明显,玉米和油菜产量较CK分别增加了104.8％和41.6％.

Effects of Different Amendments on Water and Salt Characteristics of Coastal Saline Soil

The effects of five soil amendments were studied in view of the high salt content and poor hydraulicconductivity in coastal saline soils.Soil moisture,soil salt content,soil pH value,soil bulk density and soilsaturated hydraulic conductivity were analyzed by a field plot experiment in order to select the most suitableamendment to improve the water and salt characteristics in coastal saline soil area.Results are as follows:(1)The change of the soil salt content was greatly influenced by the soil moisture.There was a very remarkably negative linear relationship between the soil salt content and soil moisture.(2)Compared with CK,thesoil salt content was decreased by 29.2%,32.6% and 25.9%at the soil depths of 0-5,5-20and 20-40cm,respectively,after the treatment of humic acid(300kg/hm²),and the soil bulk density was decreased by10.2%,while the soil porosity and soil saturated hydraulic conductivity increased.(3)The five soil amendments increased crop yield differently,and the effect of humic acid was the best.Corn and rape yields afterthe treatment of humic acid was increased by 104.8% and 41.6%,respectively,as compared with CK.