Growth and nutrient removal of three macrophytes in response to concentrations and ratios of N and P |
| |
Authors: | JianXiong Liao DeNan Zhang Azim Mallik ChengXin He GuangPing Xu |
| |
Institution: | 1. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, P.R. China;2. Department of Biology, Lakehead University, Thunder Bay, Ontario, Canada |
| |
Abstract: | 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. |
| |
Keywords: | Coix lacryma-jobi Iris wilsonii Arundo donax N and P removal biomass relative growth rate |
|
|