【摘要】 为了明确掺沙措施对河套灌区盐碱地耕层土壤结构和盐离子含量的影响,采用田间试验和室内分析的方法进行研究。结果显示:掺沙利于大直径土壤微粒的形成。掺沙后0~40cm耕层土壤的容重明显减小,中重度盐碱地的孔隙度已接近于轻度。全盐含量总体表现为20~40cm略高于0~20cm土层。轻度盐碱地Na+含量为阳离子总量的41.6%,Mg2+为26%;Cl-含量为阴离子总量的50%,SO42-为29.5%;中度盐碱地Na+含量为阳离子总量的46.3%,Ca2+为27.5%;Cl-含量为阴离子总量的37.7%,SO42-为30.6%;重度盐碱地Na+含量为阳离子总量的43.3%,Ca2+为37.2%;Cl-含量为阴离子总量的40.1%,SO42-为27.0%。中重度盐碱地中Ca2+取代Mg2+成为主要的致盐离子,Na+、Mg2+、Cl-、SO42-为主要致盐离子,掺沙能显著改善盐碱地耕层土壤的性状。更多还原

【Abstract】 In order to definitude the effect of doping sand on the soil structure and the salt ions content of the arable layer of salinized-alkalinized lands in Hetao irrigation areas,the field experiments and laboratory analysis were carried out in this study.The results showed that doping sand on arable layer of the salinized-alkalinized lands was benefit to the formation of major diameter soil particles.The capacity of the surface soil from 0 to 40 cm reduced significantly and the porosity of the moderately severe salinized-alkalinized lands became mild after doping sand.The total salt content of 20-40 cm soil layer was little higher than that of 0-20 cm soil layer.The content of Na+,Mg2 +,Cl-and SO42-of the mild salinized-alkalinized accounted for 41.6%,26%,50% and 29.5% of the total anion,respectively.The content of Na+,Ca2 +,Cl-and SO42-of the moderately severe salinized-alkalinized lands accounted for 46.3%,27.5%,37.3% and 30.6% of the total anion, respectively.In severe salinized-alkalinized lands,the content of Na+,Ca2+,Cl-and SO42-accounted for 43.3%,37.2%,40.1% and 27.0% of the total anion, respectively.In the moderately severe salinized-alkalinized lands,Ca2+has replaced Mg2+and become the main ion to lead to salty.The main ions to make the land salty were Na+,Mg2 +,Cl-and SO42-. It was indicated that mixing sand could improve the soil properties of the arable layer of salinized-alkalinized lands.更多还原