隔盐层处理对地下水浅埋区盐渍土盐分及养分变化的影响——以定边县白土岗子村土地开发项目区为例

Effect of salt layer treatment on salt and nutrient change of saline soil in shallow buried area of groundwater——Taking Baitugangzi Village land development project area in Dingbian County as an example

针对定边县地下水浅埋区蒸降比高、盐分表聚明显、农作物产量差等问题,以定边县堆子梁镇白土岗子村土地开发项目为研究对象,设置秸秆隔层、砾石隔层和对照组三组试验,分析比较了1a时间内不同土层深度(0~10、10~20、20~40cm)条件下,土壤盐分(电导率、水溶性盐总量)和土壤养分(速效K、全N及有机质)含量的变化情况。结果显示:土壤盐分含量指标中,隔层处理较对照组均有显著减少;土壤养分含量指标中,隔层处理较对照组均有显著升高;土壤盐分含量随土层深度的增加呈逐层减少的趋势,土壤养分含量随土层深度的增加呈逐层递增的趋势。因此,采用秸秆隔层和砾石隔层进行根区隔盐处理能抑制盐分表聚,降低耕作层盐分含量,提高养分含量,可为地下水浅埋区盐渍化土地开发利用的机制探讨和技术路线制订提供理论依据和参考。

In order to investigate the problems of high evaporation rate,obvious concentration of salinity and poor crop yield in shallow buried area of groundwater in Dingbian County,taking land development project of Baitugangzi village of Dingbian County as the research object,changes of soil salinity(conductivity,total water-soluble salt)and soil nutrients(quick-impact K,total N and organic matter)under different soil depth(0~10,10~20,20~40 cm)between straw partition,gravel partition and control groups during 1 year were analyzed and compared.The results showed that:Compared with the control group,the salt content of the treated soil decreased significantly.Compared with the control group,the soil nutrient content of the interlayer treatments increased significantly.The soil salt content decreased gradually with the increase of soil depth.Soil nutrient content increased gradually with the increase of soil depth.The above results showed that straw partition and gravel compartment treatment can inhibit salt accumulation,reduce the salt content and increase the nutrient content of soil tillage layer,which provide a theoretical basis and reference for exploration of the mechanism of land development and utilization and the formulation of technical routes of saline land in shallow groundwater.