围栏草原与放牧草原对苏打盐碱土理化性状的影响

目的]探明苏打盐碱化土壤在不同利用方式下土壤的物理特性及化学特性的变化趋势,为其改良利用和生态恢复提供理论依据。方法]采集围栏草原与放牧草原2个剖面的8个分层土样,并测定土壤容重、电导率、pH值、碱化度及土壤孔隙度。结果]围栏草原土壤各层容重、电导率、碱化度及总碱度均低于放牧草原;围栏草原土壤除表层的pH值明显低于退化草原外,其他各层pH值与放牧草原无明显差异;围栏草原土壤孔隙度明显高于放牧草原。结论]该研究结果表明放牧草原的盐渍化程度较围栏草原严重。

Effects of Grassland Fence and Grazing Grassland on the Physical and Chemical Properties of Soda-saline Soil

Objective]The research aimed to study the trends of physical and chemical properties of soda-saline soil under different utilization patterns,and to provide theory evidence for its improve use and ecological restoration.Method]Soil samples were collected from 8 layers of two sections of grassland fence and grazing grassland.And the indices such as volume weight of soil,conductivity,pH value,basicity and soil porosity were determined then.Result]The volume weights of each layer soil,conductivity,basicity and total basicity of grassland fence were lower than that of grazing grassland.The pH value of the surface soil of grassland fence was lower than that of grazing grassland obviously.While there was no obvious difference among other layers of the two utilization patterns.The soil porosity of grassland fence was much higher than that of grazing grassland.Conclusion]The results showed that,the degree of salinization of grazing grassland is higher than that of fence grassland.