草型生态系统构建技术在南湖富营养化防治中的应用
Application of Macrophytic Ecosystem Construction Technology for Eutrophication Prevention and Control in Nanhu Lake
投稿时间:2017-05-12  修订日期:2019-03-22
中文关键词:草型生态系统  富营养化  防治  南湖
英文关键词:macrophyte dominated ecosystem  eutrophication  ecological restoration  Nanhu Lake
基金项目:南宁市科学研究与技术开发计划项目(编号:20133145)
作者单位E-mail
陈宗永 广西南宁市南湖公园广西 南宁 530021
 
gxnnsczy@sina.com 
马海霞 广西南宁市南湖公园广西 南宁 530021
 
26253086@qq.com 
韦兰英 广西南宁市南湖公园广西 南宁 530021
 
261815546@qq.com 
吴延志 广西南宁市南湖公园广西 南宁 530021
 
2638135051@qq.com 
邓慧夫 广西南宁市南湖公园广西 南宁 530021
 
1287605573@qq.com 
刘德海 广西南宁市南湖公园广西 南宁 530021
 
1173041860@qq.cm 
杨明慧 广西南宁市新技术开发中心广西 南宁 530012 ycar@163.com 
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中文摘要:
      水体富营养化是一个全球性的问题,生态修复是富营养化治理的主要途径之一。为了探索南湖富营养化水体治理的方法及途径,观测生态系统演变过程中水质的变化情况,利用帆布及脚手架等材料在上湖区域搭建了一个约670 m2、水深1.6~2.0 m的围隔试验区。清除实验区内鱼类以减少对水体的搅动,投放EM菌种增加透明度,然后种植苦草,待沉水植物生长良好后再投放鲮(Cirrhinus molitorella)及环棱螺(Bellamya aeruginosa)、河蚌(Anodonta)等水生动物,建立新的生态系统;苦草(Vallisneria natans)种植密度为1.4 kg/m2,鲮、环棱螺、河蚌的投放密度分别为6 g/m2、10 g/m2、1 g/m2。结果显示,新的生态系统经过5个月构建完成并趋于稳定,试验水体水质从原来的地表Ⅴ类水提高至Ⅳ类(GB 3838-2002);透明度从0.25 m上升并稳定在1.8 m,透明度增加了6.2倍;高锰酸盐指数(CODMn)从8.8 mg/L下降至2.6 mg/L,整体下降了70%;总磷(TP)从0.10 mg/L下降至0.04 mg/L,减少了60%;总氮(TN)从1.37 mg/L下降至1.17 mg/L,下降了14.5%;叶绿素a从51 mg/m3下降至4.6 mg/m3,下降了91.1%。与整个湖区相比,试验区透明度提高了3倍以上,高锰酸盐指数降了3.7%,总磷降低了63.6%,总氮减少了4%;叶绿素a(Chl-a)减少了89.4%。试验表明,生态修复技术能够有效控制总磷,抑制藻类生长,显著提高透明度,对富营养化水体具有很好的改善作用,可以在南湖进行推广和实施。
英文摘要:
      Eutrophication is a global problem and ecological restoration is a primary means for managing eutrophication. Nanhu Lake is located in the core area of Nanning City, Guangxi Province. From August 2013 to February 2014, our research team conducted an ecological restoration experiment in Nanhu Lake to explore methods for treating eutrophication and the feasibility of ecological restoration in Nanhu Lake. An enclosed experimental area was set up using canvas and scaffolding in the upper lake with the area of 670 m2 and water depth of 1.6-2.0m. Herbivorous and omnivorous fish in the enclosure were removed to reduce mixing and EM [what does EM stand for?] strains were used to increase transparency. The macrophyte, Vallisneria natans, was then planted at a density of 1.4 kg/m2. After vegetation coverage reached 90%, aquatic organisms, such as Bellamya aeruginosa, Anodonta and Cirrhinus molitorella were added at densities of 10 g/m2, 1 g/m2, and 6 g/m2, respectively. Water quality was monitored during the experiment; water depth and temperature, air temperature and transparency of the test area and open area of Nanhu Lake were measured daily and TP, TN, CODMn and Chl-a were measured monthly in the test area and open area of Nanhu Lake. After 5 months, the newly constructed ecosystem was completed and stabilized and water quality in the test area increased from GradeⅤto Grade Ⅳ(GB 3838-2002). Transparency increased from 0.25 m to 1.8 m; CODMn decreased by 70%, from 8.8 mg/ L to 2.6 mg/ L; TP decreased by 60%, from 0.10 mg/L to 0.04 mg/L; TN decreased by 14.5%, from 1.37 mg/L to 1.17 mg/L and Chl-a decreased by 91.1%, from 51mg/m3 to 4.6 mg/m3. Compared to the whole lake, transparency in the test area was >3 times higher, CODMn decreased by 3.7%, TP by 63.6%, TN by 4%, and Chl-a by 89.4%. Results indicate that ecological restoration effectively controlled TP, inhibited algal growth, significantly improved water transparency and effectively treated eutrophication. The process can be expanded and implemented throughout Nanhu Lake.
陈宗永,马海霞,韦兰英,吴延志,邓慧夫,刘德海,杨明慧.2019.草型生态系统构建技术在南湖富营养化防治中的应用[J].水生态学杂志,40(2):35-40.
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