[目的]明确不同绿肥作物对土壤理化性状的影响,为滨海盐渍土改良利用提供理论依据.[方法]通过田间种植豆科绿肥田菁、草木樨,分析了绿肥生长季滨海盐渍土容重、孔隙度、pH、养分、有机质及盐离子总量的动态变化.[结果]与种植前相比,一个生长季后,种植田菁、草木樨土壤容重减轻6.72％～8.82％,孔隙度增加6.90％～9.43％;土壤有机质、有效氮含量分别较种植前增加4.56％～6.80％和9.49％～10.7％,且含量最高的是1月和3月;土壤速效磷含量降低,降幅范围为2.17％～35.6％;0～ 20 cm土层pH降低,可溶性盐离子总量及氯离子含量分别由种植前的3.36 ～5.92和1.12～ 1.89 g/kg降低到种植后的1.44～2.08和0.178～0.247 g/kg,脱盐效果显著.[结论]种植豆科绿肥田菁、草木樨可明显改善土壤物理结构,降低土壤pH与盐分水平,提高土壤有机质与有效氮含量.%[Objective] In order to provide a theoretical basis for improvement and utilization of coastal saline soil by using green manure,the effects of planting different species of green manure on saline-soil physical and chemical properties were analyzed.[Method] Two species of leguminous green manure,Sesbania cannabina and Melilotus suaveolens,were used in field experiments.Changes of soil properties,like soil bulk density,porosity,pH,nutrients,organic matter and soluble salt ions contents,were tested in one growing season of green manure.[Result] Compared to without planting,soil bulk density and contents of soil available phosphorus of soil collected from planting field was decreased from 6.72 ％ to 8.82 ％ and 2.17 ％ to 35.6 ％,respectively.In the meanwhile,the contents of soil available nitrogen and organic matter increased by 4.56 ％-6.80 ％ and 9.49 ％-10.7 ％,respectively,of which the highest periods were in January and March.And the soil porosity increased from 6.90 ％ to 9.43 ％.Besides,pH of 0-20 cm soil-layer decreased,the contents of soluble salt ions and chloride ion were significantly reduced from 3.36-5.92 and 1.12-1.89 g/kg to 1.44-2.08 and 0.178-0.247 g/kg,respectively.[Conclusion] Planting S.cannabina and M.suaveolens could improve saline soil physical and chemical properties,such as pH,organic matter,available nitrogen,as well as has obvious effects on desahing effects.
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