College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Bioresour Technol. 2016 Feb;202:198-205. doi: 10.1016/j.biortech.2015.11.049. Epub 2015 Dec 5.
Four plant species, Typha orientalis, Scirpus validus, Canna indica and Iris tectorum were selected to assess their physiological response and effects on nitrogen and COD removal to high total ammoniacal nitrogen (TAN) in constructed wetlands. Results showed that high TAN caused decreased relative growth rate, net photosynthetic rate, and leaf transpiration. C. indica and T. orientalis showed higher TAN adaptability than S. validus and I. tectorum. Below TAN of 200 mg L(-1), growth of C. indica and T. orientalis was less affected or even stimulated at TAN range 100-200 mg L(-1). However, S. validus and I. tectorum was obviously suppressed when TAN was above 100 mg L(-1). High TAN generated obvious oxidative stress showing increased proline and malondialdehyde contents, and superoxide dismutase was inhibited. It indicated that the threshold for plant self-bioremediation against high TAN was 200 mg L(-1). What's more, planted CWs showed higher nitrogen and COD removal. Removal rate of C. indica and T. orientalis was higher than S. validus and I. tectorum.
四种植物物种，香蒲、水葱、美人蕉和鸢尾，被选来评估它们对高总氨氮（TAN）人工湿地的生理响应和脱氮除 COD 的效果。结果表明，高 TAN 导致相对生长率、净光合速率和叶片蒸腾速率下降。美人蕉和香蒲比水葱和鸢尾表现出更高的 TAN 适应性。在 TAN 低于 200mg/L 时，在 TAN 为 100-200mg/L 范围内，美人蕉和香蒲的生长受 TAN 的影响较小，甚至受到刺激。然而，当 TAN 高于 100mg/L 时，水葱和鸢尾受到明显抑制。高 TAN 产生明显的氧化应激，导致脯氨酸和丙二醛含量增加，超氧化物歧化酶受到抑制。这表明植物自身对高 TAN 进行生物修复的阈值为 200mg/L。此外，种植的人工湿地表现出更高的氮和 COD 去除率。美人蕉和香蒲的去除率高于水葱和鸢尾。
