摘要
植物散流-过滤带是在过滤带前设置草本散流带,可细化分散地表成股水流,发挥散流带的增效作用(增强过滤带对污染物的净化).草本散流带在较稀疏地表股流下具有明显的增效作用,但对其在密集地表股流下是否存在增效作用尚不清楚.本研究通过在黄荆过滤带前设置五节芒散流带,观测过滤带在低(1条股流槽)、中(3条股流槽)、高(5条股流槽)3种地表股流密度下对氮磷的消除,探讨散流带在不同密度条件下对过滤带的增效作用.结果表明:无论何种密度条件,五节芒-黄荆过滤带对总氮、铵氮、硝氮、总磷的消除均显著高于纯黄荆过滤带;不同密度间的五节芒-黄荆对总氮、铵氮、硝氮、总磷的去除不存在显著性差异;五节芒散流带对黄荆过滤带的增效作用不受地表股流密度的影响.
Vegetative barrier-combined filter strips are defined as grass barriers set up before filter strips. They could make concentrated water flow disperse,which exerts the function of grass barriers（ i.e.,existence of grass barriers improves the performance of filter strips in the purification of pollutants）. In this regards,grass barriers are generally considered to be effective in the purification of pollutants when the density of concentrated flow is low,whereas little was known about this effect with an increasing density of concentrated flow. In this study,we constructed Miscanthus floridulus barrier before Vitex negundo filter strip with three densities of concentrated flow（ low： one concentrated flow channel; middle： three channels; high： five channels）. The aim of work was to identify the effect of M. floridulus combined V. negundo filter strips in reducing nitrogen and phosphorus concentration under three concentrated water flow levels. Our results showed that the combined filter strips had a higher performance in the reduction in the total N,NH4＋-N,NO3--N and total P compared to those in the V. negundo（ P〈0.05）,regardless of the water flow level. There was no significant difference in the reduction of total N,NH4＋-N,NO3--N and total P among three water flow levels（ P〈0.05）. We concluded that M. floridulus combined V. negundo filter strips could improve the reduction of nutrients,which couldn＇t be influenced by varying density of concentrated flow level.
出处
《应用生态学报》
CAS
CSCD
北大核心
2015年第9期2829-2834,共6页
Chinese Journal of Applied Ecology
基金
国家科技支撑计划项目(2012BAC16B04)
广西自然科学基金项目(2013GXNSFBA019207)
广西高校科学技术研究项目(2013YB101)
广西科技攻关项目[(桂)科研1398006]资助
关键词
植物缓冲带
最佳管理措施
散流屏障
股流槽
riparian buffer
best management practice
level spreader
concentrated flow path.
