汉江水源区生态沟渠对径流氮、磷的生态拦截效应
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国家自然科学基金重点项目"黄土高原生态建设的生态-水文过程响应机理研究"(41330858);国家自然科学基金项目(41471226);中国博士后科学基金项目(2014M562338);水利部公益性行业科研专项(201501045);绵阳师范学院博士科研启动项目(QD2014A002);绵阳师范学院青年项目(2013B09)


Effects of Ecological Ditch Interception of Nitrogen and Phosphorus in Water Source Area of Hanjiang River
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    摘要:

    [目的] 研究汉江水源区生态沟渠对径流氮、磷的生态拦截效应,为农业非点源污染的控制提供重要参考和依据。[方法] 设置生态沟渠在不同时间对不同断面水体进行监测。[结果] 同段沟渠内,侧面外来水对沟渠径流氮浓度变化影响比磷浓度变化明显;径流TN,NO3-N浓度在上游、中游和下游断面变异系数分别达到19.81%~31.88%,9.57%~16.73%和32.14%~42.81%;NH4+-N和TP在4个断面变异系数在33.33%~88.46%范围内变化;生态沟渠断面之间,水草拦截净化沟渠段氮、磷含量降低幅度在9.52%~31.11%。[结论] 沟渠生态拦截对径流氮素净化效果较明显,同时适当布局拦沙工程可以削减磷素流失。

    Abstract:

    [Objective] Studying the ecological ditch interception for reducing nitrogen and phosphorus in water source area of Hanjiang River in order to provide reference and basis for agricultural non-point source pollution control. [Methods] Ditch water of different sections was monitored at different times of rain events to study the intercept effectiveness of nitrogen and phosphorus. [Results] Nitrogen concentration was more greatly influenced by extraneous water from the ditch side than that of phosphorus at the same section. The variance coefficients of TN and NO3-N concentrations were 19.81%~42.81%, 9.57%~16.73% and 32.14%~42.81% at the upstream, middle and lower section, respectively. The variance coefficients of NH4+-N and TP were 33.33%~88.46% at four sections. Aquatic plant interception decreased the nitrogen and phosphorus concentrations by 9.52%~31.11%. [Conclusion] Ecological ditch can intercept nitrogen obviously. Meanwhile, some sand interception projects should be arranged appropriately for controlling phosphorus loss.

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刘泉,李占斌,李鹏,董廷旭,黄文军.汉江水源区生态沟渠对径流氮、磷的生态拦截效应[J].水土保持通报,2016,36(2):54-58,64

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  • 收稿日期:2015-03-29
  • 最后修改日期:2015-06-16
  • 在线发布日期: 2016-05-06