植物和基质在生态浮床去除农村地表径流氮磷中的作用

To study the role of plants and substrates in floating treatment wetland(FTW)on nitrogen and phosphorus removal from rural surface runoff, a comparative experiment was conducted by setting two concentration levels and constructing four groups. The results show that plants and substrates are effective for the removal of different forms of nitrogen and phosphorus in FTW. The removal rate of NH+₄-N is increased by 17.7% to 28.1% and 21.9% to 43.6% by plants and substrates, respectively. The removal rate of total phosphorus(TP)is increased by 33.0% and 1.9% by substrates at high and low concentrations, while the removal rate of TP is increased by 40.5% and 18.0% by plants at high and low concentrations. The removal of soluble reactive phosphorus(SRP)by plants is more stable than that by substrates. Plant roots and substrates enhance the microbial-mediated transformation of soluble nonreactive phosphorus(SNRP). The combination of plants and substrates shows stable and efficient nitrogen and phosphorus removal performance with high concentration treatment, while the nitrogen and phosphorus removal efficiency of the plant is better than that of the substrate at the low concentrations. In addition, the plant harvesting temporarily reduces the removal efficiency of nitrogen and phosphorus. In conclusion, the combined FTW with plants and substrates is suitable for in-situ treatment of rural surface runoff due to its high adaptability to water quality.