Investigation into ammonia stress on Cyperus alternifolius and its impact on nutrient removal in microcosm experiments.
Investigation into ammonia stress on Cyperus alternifolius and its impact on nutrient removal in microcosm experiments.
复制标题
DOI：
10.1016/j.jenvman.2015.08.028
复制
发表时间：
2015-11
影响因子：
8.7
通讯作者：
Wendong Tao;Jianqiu Han;H. Li
中科院分区：
文献类型：
--
作者：
Wendong Tao;Jianqiu Han;H. Li
已在人工湿地的离散氨浓度下研究了植物的氨胁迫。本研究引入高斯模型来模拟氨胁迫动力学，并研究了湿地微观世界中莎草的可逆和不可逆氨胁迫。氨胁迫对植物重量增加和氧释放潜力的影响在每周氨浓度为 27 和 28 mg N/L 时开始，在 178 和 158 mg N/L 时达到 50% 抑制，并分别在 311 和 303 mg N/L 时产生致死作用。一次性氨浓度高达 400 mg N/L 的压力是可逆的。氨浓度持续高于 219 mg N/L 会产生不可逆的压力。在氨浓度高于 50% 抑制水平的微观世界中，植物在脱氮方面发挥的作用较小。氨胁迫对脱氮性能影响不大。由于植物吸收较少，氨胁迫抑制了正磷酸盐的去除。人工湿地的设计和运营应考虑废水氨浓度，以保持人工湿地生态系统的完整性。
Ammonia stress on plants has been investigated at discrete ammonia concentrations in constructed wetlands. This study introduced a Gaussian model to simulate the kinetics of ammonia stress and investigated reversible and irreversible ammonia stress onCyperus alternifoliusin wetland-like microcosms. Ammonia stress on plant weight increase and oxygen release potential started at weekly ammonia concentrations of 27 and 28 mg N/L, reached 50% inhibition at 178 and 158 mg N/L, and resulted in lethal effects at 311 and 303 mg N/L, respectively. The stress of one-time ammonia concentrations up to 400 mg N/L could be reversible. Ammonia concentrations constantly above 219 mg N/L exerted irreversible stress. In the microcosms with ammonia concentrations above the 50% inhibition levels, plants played a minor role in nitrogen removal. Nitrogen removal performance was not affected considerably by ammonia stress. Orthophosphate removal was suppressed by ammonia stress due to less plant uptake. Design and operation of constructed wetlands should consider wastewater ammonia concentration so that the integrity of constructed wetland ecosystems can be maintained.