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Growth and nutrient removal of three macrophytes in response to concentrations and ratios of N and P

Liao, JianXiong, Zhang, DeNan, Mallik, Azim, Huang, YuQing, He, ChengXin, Xu, GuangPing
International journal of phytoremediation 2017 v.19 no.7 pp. 651-657
Arundo donax, Coix lacryma-jobi, macrophytes, phytoremediation, wastewater
Wastewater from different sources shows great differences in concentrations and ratios of N and P. In order to choose suitable plant species to remove excess N and/or P from polluted waters, it is important to know the performances of these plants under different N and P concentrations. In this study, we investigated the growth and N and P removal rate of three macrophytes, Coix lacryma-jobi, Iris wilsonii , and Arundo donax under six N and P combination treatments. C. lacryma-jobi preferred higher N and P concentrations (16 mg N L ⁻¹ and 3.2 mg P L ⁻¹), and increasing N supply could increase its P removal rate. I. wilsonii exhibited a growth preference at a combination of moderate N and P concentrations (8 mg N L ⁻¹ and 0.8 mg P L ⁻¹). A. donax could grow well at all combinations of N and P and had significantly higher relative growth rate and N and P removal rates than the other two species. These results showed A. donax is a promising species to treat various polluted waters and the other two species can be used specifically to treat certain types of wastewater.