北京地区人工湿地植物活力及污染物去除能力

研究了北京地区常见9种水生植物在水平流潜流型人工湿地中的污染物去除能力和生活力.结果表明，前边湿地单元对COD、TP、TN等污染物的去除贡献大于后边湿地单元.供试植物均可在人工湿地中正常生长，稳定生长112 d后，不同植物的氮磷含量和生物量差异显著（P<0.05），多数植物氮磷含量地下部高于地上部，地下地上部生物量比（U/A）接近或大于1.植物体内的氮磷累积量为1.36～7.89 g·m^-2和0.19～1.07 g·m^-2.植物生物量对氮磷累积量的影响力大于氮磷含量对氮磷累积量的影响力.水生鸢尾应为北京地区首选人工湿地植物，菖蒲、香蒲和荻等次之.泽泻和芦竹在人工湿地中不能越冬成活.

Growth vitality and pollutants-removal ability of plants in constructed wetland in Beijing region

Nine aquatic plant species commonly found in northern China were transplanted in a horizontal subsurface flow constructed wetland in Beijing region to study their growth vitality in the wetland and their removal ability to the pollutants in domestic sewage. The results showed that the wetland's front unit had greater contribution to the COD, TN and TP removal than the rear ones, and all test plant species could grow well in the wetland. After growing for 112 days, different plant species had significant differences in their N and P contents and total biomass (P <0.05). For most species, the N and P contents were higher in underground than in aboveground part, and the biomass ratio of under-/aboveground part (U/A) was close to or exceeded 1. The accumulated N and P in the plants ranged from 1.36 to 7.89 g m(-2) and from 0.19 to 1.07 g m(-2), respectively, and the N and P accumulation in plants were more affected by plant biomass than by its N and P contents. Among the test plant species, Iris pseudacorus ranked the first in setting up the constructed wetland, followed by Typha angustifolia, Acorus calamus, and Triarrhena sacchariflora, whereas Alisma plantago-aquatica and Arundo donax were not recommended due to their sensitivity in cold winter in northern China.