[Purification effects on nitrogen under different concentration and nitrogen conformation transform principles by Vallisneria spiraslis L].
[Purification effects on nitrogen under different concentration and nitrogen conformation transform principles by Vallisneria spiraslis L].
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发表时间：
2008-04
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通讯作者：
Pei-fang Wang;Chao Wang;Xiao-rong Wang;Yan Xue;Aibin Yang
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作者：
Pei-fang Wang;Chao Wang;Xiao-rong Wang;Yan Xue;Aibin Yang
湿润植被在不同污染负荷下表现出不同的生理作用，从而对污染物产生不同的净化效果。目前，我国各江河、湖泊、池塘水体均受到不同程度的污染，净化水平不一，对典型的沉水植物苦草（Vallisneria spiraslis L.）研究了不同净化水平对长江中下游河湖中广泛分布的总氮（TN）的净化效果。本文的目的是研究苦草对氮素的降解作用，9月7 ~ 22日7种氮素负荷下叶片和根系氮素积累分配规律及无机氮形态转化特征，2006. 7种氮负荷分别为1.0 mg/L、5.0 mg/L、10.0 mg/L、20.0 mg/L、40.0 mg/L、60.0 mg/L和80.0 mg/L。实验结果表明，苦草具有较好的抗逆能力。当TN浓度≤ 60 mg/L时，植被对氮素的净化作用显著，且6种负荷中植被的贡献规律相似。当TN负荷大于80.0mg/L时，苦草（Vallisneria spiraslis L.）对氮净化没有明显的贡献。同时，对苦草叶片和根系的氮素积累规律进行了研究。与TN负荷相关。但其在叶-根中的分配比与氮负荷无关。随着TN负荷的增加，无机氮形态转化特征发生变化。结果表明，当氮负荷小于20.0 mg/L时，氨氮浓度迅速下降，随着氮负荷的增加，氨氮在无机氮中的浓度比例显著增加。结果表明，苦草属植物苦草（Vallisneria spiraslis L。对不同富营养化水体氮素的净化贡献程度不同，有利于不同富营养化水体氮素的去除和湿地植被的恢复。
Wet vegetation performed different physiological actions under different pollution loads, thus inducing different purification effects on pollutants. Since water of various rivers, lakes and ponds are polluted at different extents and purification levels currently in China, a typical submerged vegetation, Vallisneria spiraslis L. is selected to study the purification effects on total nitrogen(TN) under different purification levels, which is widely distributed in rivers and lakes of Yangtz middle and down stream. The targets of this paper are to determine the nitrogen degradation impacts of Vallisneria spiraslis L., and nitrogen accumulation and distribution in leaf and root rules, and inorganic nitrogen conformation transformation characters under 7 nitrogen loads during 7 to 22 Sept., 2006. The 7 nitrogen loads are 1.0 mg/L, 5.0 mg/L, 10.0 mg/L, 20.0 mg/L, 40.0 mg/L, 60.0 mg/L and 80.0 mg/L. The experiment data show that Vallisneria spiraslis L. have significant effects on nitrogen purification while the TN concentration equal to and less than 60 mg/L, and the contribution principles of vegetation are similar among the 6 loads. Whereas, when the TN load bigger than 80.0 mg/L, Vallisneria spiraslis L. have no obvious contribution on nitrogen purification. Meanwhile, the nitrogen accumulation principles in the leaf and root of Vallisneria spiraslis L. is interrelated to the TN load. However, its distribution ratio in leaf to root is unrelated with TN load. Furthermore, the conformation of inorganic nitrogen transform characters changed with the TN load increasing. It is concluded that ammonia concentration decreased rapidly while the nitrogen load less than 20.0 mg/L, and the ammonia concentration ratio in the inorganic nitrogen increased remarkably with the nitrogen load increasing. Results indicate Vallisneria spiraslis L. have different purification contribution extents which can be benefit for nitrogen removal in different eutrophicated water and wet vegetation restoration.