不同植物下湿地土壤磷状况与植物脱磷效应

生态湿地作为一种新型污水处理系统日益受到人们的重视。文章以镇江北固山湿地为研究对象,研究了不同植物下土壤总磷的变化、速效磷变化、植物根构型以及不同植物脱磷的能力。结果表明,该湿地的土壤具有较好的同源性。芦苇由于每年收割,致使它的土壤总磷含量低。虉草的根系发达,植株含磷量大,总生物量大,因此,它的脱磷能力强。这些结论为湿地的修复和重建提供了理论依据。

PHOSPHORUS CONDITION OF SOIL WITH DIFFERENT PLANTS IN WETLAND AND THE ABILITY OF DEPHOSPHORIZATION OF WETLAND PLANTS

The ecological wetland,a kind of new-type sewage disposal system,is paid attention by people day by day.With the natural wetland on the riverside in Zhenjiang as a research object,this paper studied the changes of total phosphorus in soil with different plants,available phosphorus,root architectural characteristics and potential of dephosphorization of different plants.The result indicates that the soil of this wetland is of good homology.Because the reed is reaped in every year,there are lower contents of total phosphorus in the soil.The root system of Phalaris arundinacea is developed well,the phosphorus content of the plant is higher,and the total biomass is great.Therefore Phalaris arundinacea ‘s dephosphorization ability is strongest.These conclusions have offered a theoretical foundation for wetland remediation and reconstruction.