Spring is the most serious season of soil salification in Hetao Inner Mongolia .A field experiment was conducted on top soil mulched by Medicago sativa ,Leymus chinensis , Puccinellia distans , Panicum virgatum ,Melilotus Mill , Salsola collinag and Avena sativa in Hetao Inner Mongolia to assess effects of residues from different plant specie on pH and saline during winter and spring for selecting appropriate winter and spring mulching vegetation vegetation in the area .The results indicated that the EC value of top soil decreased 42％ ～73％ , averagely reduced 61％ by plant residue mulched in winter and spring . It might be related to decreased contents of Na+ 、K+ 、Ca2+ 、Mg2+ and Cl- . However ,the pH value ,CO32- and HCO3 - content increased .In general ,the perennial plants residue mulching have better effect on alleviating soil salinization .In addition ,Medicago sativa L ,Leymus chinensis and Panicum virgatum are suitable to be used as the regional mulching vegetation in winter and spring .%春季是内蒙古河套地区土壤返盐和积盐最严重的季节.本研究在内蒙古河套地区典型盐渍化土壤上设置田间试验,比较紫花苜蓿、羊草、碱茅、柳枝稷、草木樨、猪毛菜和燕麦植株残体冬春季地表覆盖下,表层土壤pH及盐分含量的差异,以期筛选出合适的冬春季植被.结果表明,冬春季植被残体地表覆盖抑盐效果明显,表层土壤EC值降低了42％ ～73％,平均为61％,这可能是由于Na+、K+、Ca2+、Mg2+及Cl-含量降低所致;但土壤pH值、CO32-和HCO3-含量有所升高.总体来看,多年生植被残体覆盖抑制盐分表聚的效果更好一些,其中紫花苜蓿、羊草和柳枝稷,较适于用作本地区冬春季地表覆盖植被.
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