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草业学报  2015 

景电灌区次生盐渍化土地枸杞林的土壤特征研究

DOI: 10.11686/cyxb20150508, PP. 66-74

Keywords: 次生盐渍化土壤,枸杞种植,土地利用方式,土壤性状

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Abstract:

为评价种植枸杞对改良次生盐渍化土壤的效果,实现次生盐渍化土地资源的持续利用,对次生盐渍化土地不同利用方式的弃耕地、不同种植年限枸杞地和小麦地的土壤理化性质进行了调查研究。结果表明,与弃耕地相比,枸杞地土壤有机质、全氮、碱解氮含量显著增加;水溶性盐离子除HCO3-显著增加、Ca2+降低不明显外,K+、Na+、Mg2+、Cl-、SO42-、全盐量、电导率均显著降低,离子组成中Na+降幅最大,达70.1%~82.9%,全盐量降低70.9%~82.8%;砂砾含量降低、粉粒和粘粒含量升高,CaCO3含量升高,pH值降低,容重先降低后升高,孔隙度先升高后降低。枸杞地Na+和全盐量比小麦地分别高118.1%~282.3%和84.0%~211.5%,其他土壤理化指标和小麦地没有差异。这些说明种植枸杞改善了次生盐渍化土壤质量,除占盐分主导地位的Na+含量明显较高外,其他土壤性状恢复至与盐渍化程度低的传统农耕地相当。种植枸杞的前4年间土壤理化性质发生了迅速变化,之后变化速度很缓慢。土地利用方式的变化对次生盐渍化土壤性状具有重要影响。

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