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首页> 外文期刊>Frontiers of environmental science & eng >Decontamination efficiency and root structure change in the plant-intercropping model in vertical-flow constructed wetlands
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Decontamination efficiency and root structure change in the plant-intercropping model in vertical-flow constructed wetlands

机译：垂直流人工湿地间作模型间的去污效率和根系结构变化

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摘要

Subtropical climatic conditions can contribute to the death of the aerial parts of constructed wetland plants in winter. This presents a barrier to the widespread application of constructed wetland and is an issue that urgently needs to be solved. Three contrasting experiments, the plant-intercropping model (A), the warm-seasonal plant model (B), and the non-plant model (C), were studied in terms of their efficiency in removing pollutants, and the change in root structure of plants in the plant-intercropping model within the vertical-flow constructed wetlands. The results indicate that model A was able to solve the aforementioned problem. Overall, average removal rates of three pollutants (COD_(Cr), total nitrogen (TN) and total phosphorous (TP)) using model A were significantly higher than those obtained using models B and C (P＜0.01). Moreover, no significant differences in removal rates of the three pollutants were detected between A and B during the higher temperature part of the year (P＞0.05). Conversely, removal rates of the three pollutants were found to be significantly higher using model A than those observed using model B during the lower temperature part of the year (P ＜ 0.01). Furthermore, the morphologies and internal structures of plant roots further demonstrate that numerous white roots, whose distribution in soil was generally shallow, extend further under model A. The roots of these aquatic plants have an aerenchyma structure composed of parenchyma cells, therefore, roots of the cold-seasonal plants with major growth advantages used in A were capable of creating a more favorable vertical-flow constructed wetlands media-microenvironment. In conclusion, the plant-intercropping model (A) is more suitable for use in the cold environment experienced by constructed wetland during winter.
机译：亚热带气候条件可能导致冬季人工湿地植物的空中部分死亡。这为人工湿地的广泛应用提供了障碍，并且是迫切需要解决的问题。就植物间作模型（A），暖季植物模型（B）和非植物模型（C）进行了三个对比实验，研究了它们的去除污染物效率以及根系结构的变化。垂直流人工湿地植物间作模型中的植物数量结果表明模型A能够解决上述问题。总体而言，使用模型A的三种污染物（COD_（Cr），总氮（TN）和总磷（TP））的平均去除率显着高于使用模型B和C的去除率（P ＜0.01）。此外，在一年中的高温部分，A和B之间的三种污染物的去除率没有显着差异（P＞ 0.05）。相反，在一年的较低温度部分，使用模型A观察到的三种污染物的去除率明显高于使用模型B观察到的（P ＜0.01）。此外，植物根的形态和内部结构进一步表明，在模型A下，许多白根（通常在土壤中分布较浅）进一步延伸。这些水生植物的根具有由薄壁组织细胞组成的气孔结构，因此， A中具有主要生长优势的冷季植物能够创造出更有利的垂直流人工湿地介质-微环境。总之，植物间作模式（A）更适合在冬季人工湿地所经历的寒冷环境中使用。

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  • 来源
    《Frontiers of environmental science & eng》 |2013年第6期|906-912|共7页
  • 作者

    Yonghua CHEN; Xiaofu WU; Mingli CHEN; Kelin LI; Jing PENG; Peng ZHAN;

  • 作者单位

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

    Research Center of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;

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  • 正文语种 eng
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  • 关键词

    vertical-flow constructed wetlands; plant intercropping model; warm seasonal plant model;

    机译：垂直流人工湿地;植物间作模型温暖的季节性植物模型;

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