Average annual NH4
þ removal rates ranged from 55 to 80%, with the highest removal rate from C. flabelliformis wetland
and the lowest removal rate from V. zizanioides wetland. C. flabelliformis wetland had a significantly higher annual average
NH4
þ removal rate than V. zizanioides wetland (P < 0.01) and P. australis wetland (P < 0.05), and the NH4
þ removal rate from A.
calamus wetland was higher than that from V. zizanioides wetland