芦苇占优势农田溪流营养盐滞留的水文和生物贡献分析

发布时间：2018-01-06 14:20

本文关键词：芦苇占优势农田溪流营养盐滞留的水文和生物贡献分析　出处：《水利学报》2016年08期 　论文类型：期刊论文

【摘要】：为解析大型水生植物大量生长情形的源头溪流营养盐滞留的水文、生物作用贡献,于2014年9月—2015年6月在南淝河流域某一芦苇占显著优势的农田源头溪流段,开展8次野外示踪实验,计算渠段雷诺数Re、弗劳德数Fr、曼宁糙率系数n等水动力学参数,估算NH4+、PO43-的总滞留率以及水文、生物过程的实际滞留贡献率和相对滞留贡献率。结果表明,整个研究期间溪流水体表现出显著的紊流特征,水流流态属于缓流类型,渠道曼宁糙率系数n变化范围为0.066~0.112,平均值为0.089;NH4+总滞留损失率变化范围为9.17%~28.27%,平均值为14.68%,水文作用和生物过程对NH4+实际滞留贡献率平均值分别为10.12%和4.57%,相对贡献率平均值分别为72.51%和27.49%,表明NH4+滞留损失主要来自水文过程的影响;PO43-总滞留损失率变化范围为5.75%~17.79%,平均值为12.53%,水文作用和生物过程对PO43-实际滞留贡献率平均值分别为10.12%和2.41%,相对贡献率平均值分别为81.42%和18.58%,表明PO43-滞留损失也主要来自水文因素的影响;n与Re、Fr和Q均呈显著的幂函数关系,而实际滞留率ηNH4、ηPO4与n、Re之间均没有表现出明显的相关关系。
[Abstract]:For the analysis of hydrological macrophytes rwqha nutrient large growth retention, biological contribution, in September 2014 to June 2015 in the South Feihe River Basin a reed dominant farmland source streams, to carry out the 8 field tracer experiment, calculation of canal Reynolds number Re, Froude Fr, Manning NH4+ estimates the roughness coefficient n, hydrodynamic parameters, total retention rate of PO43- and hydrology, actual biological processes remain the contribution rate and the contribution rate of relative retention. The results showed that during the whole study period stream water shows the significant features of the turbulent flow pattern, flow channel belongs to the type, Manning roughness coefficient of the N range was 0.066~0.112, the average the NH4+ value is 0.089; total retention loss rate range is 9.17%~28.27%, the average value is 14.68%, the hydrological effects and biological process of NH4+ actual retention contribution rate was respectively 10.12% and 4.57%, The relative contribution rate of the average values were 72.51% and 27.49%, showed that the effect of NH4+ retention mainly from the hydrological process; PO43- total retention loss rate range is 5.75%~17.79%, the average value is 12.53%, the hydrological effects and biological process of PO43- the actual contribution rate of average retention values were 10.12% and 2.41%, the relative contribution rate of average value was 81.42% and 18.58%, that PO43- retained losses are mainly from the hydrological factors; N and Re, Fr and Q showed a significant powerfunction relationship, but the actual retention rate of NH4 PO4 and N Re, ETA, had showed no obvious correlation.

【作者单位】：合肥工业大学资源与环境工程学院;
【基金】：国家自然科学基金项目(51179042,51579061)
【分类号】：X52
【正文快照】： 1研究背景长期以来,农田溪流、沟渠系统作为生态系统服务(如营养循环、生物多样性、生境、水质净化等)提供者的角色,很少受到人们的重视[1-2]。但随着河流、湖泊水环境污染治理工作的不断深入,特别是非点源污染控制工作的逐步加强,农业溪流、沟渠系统对氮磷污染物的截留、净化

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