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引用本文:蔡舰,白承荣,巴图那生,娜仁格日乐,高光.盐度对芦苇(Phragmites australis)表流湿地除氮效果的影响.湖泊科学,2017,29(6):1350-1358. DOI:10.18307/2017.0607
CAI Jian,BAI Chengrong,BATU Nasheng,NAREN Gerile,GAO Guang.Effect of salinity on nitrogen removal performance in a Phragmites australis constructed surface flow wetland. J. Lake Sci.2017,29(6):1350-1358. DOI:10.18307/2017.0607
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盐度对芦苇(Phragmites australis)表流湿地除氮效果的影响
蔡舰1,2, 白承荣1,2, 巴图那生3, 娜仁格日乐3, 高光1
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院大学, 北京 100049;3.新疆巴音郭楞蒙古自治州博斯腾湖科学研究所, 库尔勒 841000
摘要:
利用芦苇湿地去除农业污水中的氮是博斯腾湖流域控制富营养化的重要手段.但是,污水中的盐分往往会抑制芦苇(Phragmites australis)湿地的除氮效果.为了探索不同盐度对芦苇湿地脱氮效果的影响和机制,研究4个不同的盐度梯度(淡水、2‰、5‰和10‰)对芦苇表流湿地中氮去除的影响,测定不同盐度下湿地表层(0~10.0 cm)和下层土壤(10.0~20.0 cm)中硝化、反硝化作用强度的变化.结果表明,盐度上升显著降低了湿地氮的去除率,但是不同离子形态的氮变化趋势并不一致.5‰和10‰盐度下的芦苇湿地中总氮、铵态氮去除率分别下降了9.03%、31.80%和23.10%、39.20%,亚硝态氮累积率分别上升了190%、690%,而硝态氮并未发生明显变化.相对于参与反硝化作用的菌群,盐度对参与硝化作用菌群的抑制作用更强是产生此现象的主要原因.除此之外,盐度升高导致植物根系泌氧减少也是土壤中的硝化作用强度降低的重要原因之一.
关键词:  芦苇表流湿地  盐度  农排污水  除氮  硝化作用  反硝化作用  博斯腾湖
DOI:10.18307/2017.0607
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2013ZX07104-004)和环保公益性行业科研专项(201309041)联合资助.
Effect of salinity on nitrogen removal performance in a Phragmites australis constructed surface flow wetland
CAI Jian1,2, BAI Chengrong1,2, BATU Nasheng3, NAREN Gerile3, GAO Guang1
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.Institute of Lake Bosten, Bayingolin Mongolia Autonomous Prefecture of Xinjiang Uyghur Autonomous Province, Korle 841000, P. R. China
Abstract:
Application of surface flow wetland constructed by Phragmites australis to remove the nitrogen from agricultural drainage is one of most important policies to control the eutrophication in Lake Bosten. However, nitrogen removal process will be challenged from the salinity inhibition in wastewater. We explored the effect of salinity on nitrogen removal in 4 wetlands with increasing salinity (freshwater, 2‰, 5‰, and 10‰). Concurrently, we also assessed the nitrification and denitrification potential at two soil layers (0-10.0 cm and 10.0-20.0 cm, respectively). The results showed that removal rates of total nitrogen decreased by 9.03% and 31.80% in 5‰ and 10‰ salinity, respectively. Similarly, removal rates of the ammonia also declined by 23.10% and 39.20%, respectively. On balance, the higher salinity significantly inhibited the nitrogen removal, suggesting that salinity would interfere in nitrification process. By contrast, the nitrite nitrogen was increased by 190% and 690% in 5‰ and 10‰ salinity, respectively, implying that salinity potentially inhibited the nitrite oxidizers. Additionally, we also found that salinity and dissolve oxygen together regulated the nitrification and denitrification in different soil layers.
Key words:  Phragmites australis constructed surface flow wetland  salinity  agricultural drainage  nitrogen removal  nitrification  denitrification  Lake Bosten
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