Distribution of Soil Nutrients and Heavy Metals in Rhizosphere versus Non-rhizosphere Area of Different Landscape Plants in Nanjing
Six landscape plants,Lonicera maackii,Cercis chinensis,Chimonanthus praecox,Syzygiurn aromaticum,Hibiscus syriacus,and Chaenomeles speciosa in Nanjing were selected.However,the distribution of soil nutrients and soil heavy metals in the rhizosphere and non-rhizosphere areas of these six landscape plants in this region had been largely unknown.The results were as follows:(1)The soil nutrients and heavy metals of different landscape plants of rhizosphere and non-rhizosphere had the same change,also with the main control factors,and the content of soil nutrients and heavy metals in rhizosphere was higher than that of non-rhizosphere,while pH was lower than that of non-rhizosphere.(2)The soil nutrients and heavy metals of different landscape plants showed significant enrichment and pH showed significant loss,while soil total phosphorus in rhizosphere had no significant difference to non-rhizosphere soil (p＞0.05).(3)The contents of available heavy metals extracted by TCLP correlated with total contents of heavy metals,which showed the total soil heavy metal was one of the important sources of the available soil heavy metal.(4)Correlation analysis showed that,as for the rhizosphere soil,soil organic carbon and total nitrogen had the larger influence on soil heavy metals,as for the non-rhizosphere soil,soil organic carbon and total nitrogen had the larger influence on soil available heavy metals.pH had the significant or extremely significant negative correlation relationship with soil heavy metals,while soil total phosphorus had no correlation relationship with soil heavy metals.It indicated that the rhizosphere enrichment effect occurred for different landscape plants,rhizosphere enrichment effect was found to increase soil nutrients by reducing soil pH,and the content of soil available heavy metals was more sensitive than that of soil heavy metals.
landscape plantsrhizospherenon-rhizospheresoil nutrientsoil heavy metals
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