植物对绿地土壤吸附性能的改良

Improvement of soil adsorption performance of green space by plants

为探究植物对绿地土壤污染物吸附性能的影响,选取4种性质的绿地土壤,并栽培萱草(Hemerocallis fulva L.)、鸢尾(Iris tectorum Maxim.)、八仙花[Hydrangea macrophylla(Thunb.)Ser.]和酢浆草(Oxalis corniculata L.)4种植物,培养完成后分析不同绿地土壤对氮、磷、COD(化学需氧量)的吸附能力。结果表明,植物可以显著提高绿地土壤对氮、磷、COD的吸附能力。植物对绿地土壤氮、磷、COD吸附能力的贡献率分别为33.12%、10.45%、17.63%。且植物与绿地土壤性质对污染物质的吸附存在明显的交互作用。氮、磷、COD吸附能力相对较好的配比分别是土∶砂∶生物质炭(4∶4∶2)+1%PAM+萱草、土∶砂∶椰糠(4∶4∶2)+1%PAM+八仙花、土∶砂∶椰糠(4∶4∶2)+1%PAM+酢浆草。

In order to explore the influence of plants on the adsorption performance of green space soil pollutants,green space soil with four properties was selected.And four plants of Hemerocallis fulva L.,Iris Tectorum Maxim.,Hydrangea macrophylla(Thunb.)Ser.,and Oxalis corniculata L.were cultivated,and the adsorption capacity of soil to N,P and COD(chemical oxygen demand)was analyzed in different green space after cultivation.The results showed that plants could significantly improve the adsorption capacity of soil to N,P and COD.The contribution rate of plants to the adsorption capacity of N,P and COD were 33.12%,10.45% and 17.63%,respectively.There was an obvious interaction between plant and soil properties on the adsorption of pollutants.The relatively good ratio of nitrogen,phosphorus and COD adsorption capacity was soil mixed with sand and biochar(volume ratio of 4∶4∶2)and 1% PAM and Hemerocallis fulva,soil mixed with sand and coir(volume ratio of 4∶4∶2)and 1% PAM and Hydrangea macrophlla,soil mixed with sand and coir(volume ratio of 4∶4∶2)and 1% PAM and Oxalis corniculata L.,respectively.