Effects of plant physiological responses under nitrogen stress on pollutant removal in subsurface constructed wetlands
Effects of plant physiological responses under nitrogen stress on pollutant removal in subsurface constructed wetlands
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氮胁迫下植物生理反应对地下人工湿地污染物去除的影响
DOI：
10.1016/j.jwpe.2022.103351
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发表时间：
2023-02
影响因子：
7
通讯作者：
Yanbin Chi
中科院分区：
文献类型：
--
作者：
Zihui Yao;Yongxiang Ren;Bin Li;Ge Bai;Siqi Zhao;Lei Yang;Yanbin Chi
氮负荷直接影响植物代谢、形态发生和根际效应，进而影响人工湿地的污染物去除性能。然而，在世界上许多设计规范中，氮负荷标准有很大差异。研究了潜流人工湿地植物（美人蕉）在不同氮胁迫下的生理反应及污染物去除特性。在120 mgN/L的适宜环境下，美人蕉的抗逆性增强和细胞结构稳定是可持续的。然而，当NSs超过0、300和600 mg /L时，细胞结构被永久性破坏。适宜的氮肥处理可通过持续提高叶片的产氧（光合作用）和输氧（根通气组织发育）能力，使叶片径向氧损失和溶解氧浓度分别提高40.33%和43.11% （p< 0.01）。同时，氮转化细菌的丰度和多样性显著增加（p < 0.01），氨单加氧酶、质周硝酸盐还原酶活性和NH4+−N和NO3−−N的去除率几乎提高了一倍。控制氮素负荷是非常重要的，因为氮素会导致植物整个生长时期根系通气组织发育的有机和不可逆差异，从而持续影响SFCWs中污染物的去除效率和稳定性。
Nitrogen loading directly affects plant metabolism, morphogenesis and rhizosphere effect, and then the pollutant removal performance of constructed wetlands. However, the nitrogen loading standards are significantly different in many design specifications around the world. The physiological responses of plants (Canna indica) and pollutant removal characteristics under different nitrogen stresses (NSs) in subsurface flow constructed wetlands (SFCWs) were investigated. Under appropriate NS of 120 mgN/L, the enhancement of stress resistance and the stabilization of cell structures ofCanna indicawere sustainable. However, with excessive NSs of 0, 300 and 600 mgN/L, the cell structure was damaged permanently. Appropriate NS could significantly increase the radial oxygen loss and dissolved oxygen concentration in SFCWs by 40.33 % and 43.11 % by persistently enhancing oxygen production (photosynthesis) and delivery capacity (root aerenchyma development) (p< 0.01). Simultaneously, the abundance and diversity of nitrogen-transforming bacteria significantly increased (p < 0.01), the activities of ammonia monooxygenase, periplasmic nitrate reductase and the removal rate of NH4+− N and NO3−− N almost doubled. Controlling nitrogen loading is very important since NS would lead to the organic and irreversible difference in aerenchyma development in roots throughout the whole growth period of plants, which could persistently affect the removal efficiency and stability of pollutants in SFCWs.
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影响因子：
7.7
作者：
Maryam Salehi Pourbavarsad;Behnaz Jalili Jalalieh;N. Landes;W. Jackson
通讯作者：
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8.7
作者：
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3.8
作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
8.9
作者：
X. Mei;Zhihong Ye;M. H. Wong
通讯作者：
X. Mei;Zhihong Ye;M. H. Wong