摘要
为研究植物对氮素在生物滞留系统中迁移与累积的影响,推动黄土分布区雨水生物滞留系统植被建设,选取马蔺、萱草、八宝景天、金色麦冬和无植物构建5组生物滞留系统模拟装置,探讨不同植物处理下氮素在填料中的迁移和各介质中的累积情况。结果表明,试验期间植物氮素的累积量和植物生物量增加量关系密切,均表现为八宝景天>马蔺>萱草>金色麦冬,且植物吸收的氮素主要累积在植物的上部结构中;5组生物滞留系统填料中NH4+-N的分布差异不显著且含量较低,NH4+-N主要在填料层上部通过吸附作用去除,各系统对NH+4-N均有较好的去除效果;植物对于填料中NO-3-N分布和NO-3-N在系统中的迁移影响显著,相对于无植物组,存在植物的系统可降低填料中NO-3-N含量,进水前填料中NO-3-N含量越低NO-3-N出水浓度越低;5种处理下TN平均去除率表现为马蔺(50.59%)>八宝景天(43.99%)>萱草(37.85%)>金色麦冬(30.51%)>无植物(26.09%)。
In order to study the effects of plants on the migration and accumulation of nitrogen in the biological tion reten-system,and promote the vegetation construction of rainwater biological retention system in loess distribution area,5 groups of biological retention system simulation devices were constructed by selecting Iris,Hemerocallis,Sedum,pogon Ophio-and non-plants.The migration of nitrogen in fillers and the accumulation of nitrogen in each medium under ent differ-plant treatments were investigated.The results show that there was a close relationship between plant nitrogen mulation accu-and plant biomass increase during the experiment,which was as follows:Sedum>Iris>Hemerocallis>pogon.Ophio-The nitrogen absorbed by plants was mainly accumulated in the upper structure of plants.The distribution difference of NH4+-N in the five groups of biological retention system fillers is not significant and the content of NH+4-N is low.NH+4-N is mainly removed in the upper part of the packing layer by adsorption,and each system has a good removal effect on NH+4-N.Plants have a significant effect on the distribution of NO-3-N in the packing and the migration of NO-3-N in the system.Compared with the non-plant group,the system with plants can reduce NO-3-N content in the filler,and the lower the NO-3-N content in the filler before influent,the lower the NO-3-N effluent concentration.The average TN removal rates of 5 treatments were as follows:Iris(50.59%)>Sedum(43.99%)>Hemerocallis(37.85%)Ophiopogon>(30.51%)>Key non-plant(26.09%).
作者
王洪浩
赵凡
李京玲
姚瑶
薛恬鑫
WANG Hong-hao;ZHAO Fan;LI Jing-ling;YAO Yao;XUE Tian-xin(College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《水电能源科学》
北大核心
2023年第4期76-80,共5页
Water Resources and Power
基金
山西省自然基金项目(201901D111059)
国家自然科学基金青年基金项目(51409184)。
关键词
生物滞留系统
植物
迁移
累积
氮素
bioretention system
plant
migration
accumulation
nitrogen
