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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Nitrogen removal efficiencies in a free water surface constructed wetland in relation to plant coverage
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Nitrogen removal efficiencies in a free water surface constructed wetland in relation to plant coverage

机译：自由水面人工湿地中除草效率与植物覆盖率的关系

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摘要

Vegetation coverage is considered to be a key factor controlling nitrogen removal in wetlands. We describe the use of newly designed stainless steel incubation chambers to detect shifts in the in situ nitrate reduction activities associated to areas covered with common reed {Phragmites australis) and cattail (Typha latifolia) in the sediment of a free water surface constructed wetland (FWS-CW). Activities were measured at six different positions and times of the year and were related to physicochemical and hydraulic variables. Mean nitrate + nitrite reduction activities varied from 11.1 to 69.4 mg N/m~2 /h and showed a high variability within sediment types. Ammonification rates accounted for roughly 10% of the total nitrate reduction and were especially relevant in vegetated areas. Measured activities were highly above total nitrogen removal efficiencies estimated in the three parallel treatment cells of the Empuriabrava FWS-CW, indicating the potentiality of the system. In situ nitrate reduction activities correlated well with physi-chochemical characteristics such as pH and temperature. Additionally, differences in the total nitrogen removal efficiencies were detected between the three treatment cells and were related to changes in the water retention time. The plant species effect was detected in treatment cells of comparable hydraulic loads in which vegetation belts dominated by Typha latifolia were shown to have greater nitrogen removal efficiencies.
机译：植被覆盖被认为是控制湿地氮去除的关键因素。我们描述了使用新设计的不锈钢培养箱来检测与自由水面人工湿地（FWS）沉积物中的普通芦苇（芦苇）和香蒲（香蒲）覆盖的区域相关的原位硝酸盐还原活动的变化-CW）。在一年中的六个不同位置和时间测量活动，这些活动与理化和水力变量相关。硝酸盐和亚硝酸盐的平均还原活性在11.1至69.4 mg N / m〜2 / h之间变化，并且在沉积物类型中显示出很大的变化性。氨化率约占硝酸盐总减少量的10％，在植被覆盖地区尤为重要。测得的活性远高于Empuriabrava FWS-CW的三个平行处理池中估计的总氮去除效率，表明该系统具有潜力。原位硝酸盐还原活性与诸如pH和温度等物理化学特征密切相关。另外，在三个处理池之间检测到总氮去除效率的差异，并且与保水时间的变化有关。在相当水力负荷的处理单元中检测到植物物种的影响，其中以香蒲为主的植被带显示出更高的脱氮效率。

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