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有色金属(冶炼部分):2021,(3):162-173
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南京生态科技岛海绵城市河道系统植物技术设施对水体重金属及营养盐净化能力评价
叶海跃1, 熊星2, 谢伟芳1
(1.江苏开放大学;2.南京农业大学)
Evaluation on Purification Capacity of Plant Technology Facilities for Heavy Metals and Nutrients in River Course of A Sponge City of Nanjing Eco-technology Island
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投稿时间:2020-08-16    修订日期:2020-08-28
中文摘要: 为探究海绵城市植物技术设施重金属及营养盐净化能力,以江心洲南京生态科技岛河道系统为研究对象,对其上下游水体中重金属及营养盐含量进行分析,通过综合污染指数法对上下游重金属风险进行评估,采用冗余分析及spearman相关系数探究水体环境因素对重金属含量的影响,利用河道区域四种植物技术设施(河岸缓冲带、植被过滤带、生态浮岛、台地式石笼护岸)探究不同植物组合对水体中污染物的净化能力。结果显示,江心洲河道上游重金属的枯水期、丰水期及平水期WQI值分别为1.85、1.74及2.90,分别对应为重金属轻度污染、轻度污染及中度污染。而河道下游重金属的枯水期、丰水期及平水期的WQI值分别为0.18、0.30及0.52,均未存在污染现象。河道上游水体中pH是影响重金属含量的最重要因素,pH与溶解氧(DO)、总氮(TN)、五日化学需氧量(COD5)及总磷(TP)呈正相关。河道下游水体的pH也是影响水中重金属含量最重要的环境因素,其与溶解氧(DO)呈显著正相关。水体中营养盐净化能力大小为河岸缓冲带>植被过滤带>生态浮岛>台地式石笼护岸。相比其它植物组合,乔灌木群落栽植对水体中营养盐净化最具有潜力。
Abstract:To explore purification capacity of heavy metals and nutrients in plant technology facilities of river course of a sponge city, Jiangxinzhou in Nanjing ecological science and technology island was selected as research object, contents of heavy metals and nutrients in upstream and downstream water were determined. Risk of heavy metals in upstream and downstream water was evaluated by comprehensive pollution index method. Redundancy analysis and spearman correlation coefficient were used to explore impact of water environmental factors on heavy metal content. Four plant technology facilities (riparian buffer zone, vegetation filter belt, ecological floating island and platform type gabion revetment) were used to explore purification capacity of different plants combinations for pollutants in water. The results show that WQI values of heavy metals in upstream water of river course in dry season, wet season and normal season are 1.85, 1.74 and 2.90, respectively, corresponding to light pollution, mild pollution and moderate pollution. However, WQI values of heavy metals in dry season, high flow period and normal water period are 0.18, 0.30 and 0.52, respectively, exhibiting no pollution in downstream water of river course. pH value is the most important factor affecting content of heavy metals in upstream water of course. pH value is insignificantly positive correlation with dissolved oxygen (DO), total nitrogen (TN), five-day chemical oxygen demand (COD5) and total phosphorus (TP). pH value of downstream water of river course is also the most important environmental factor affecting content of heavy metals in water, and it is significantly positively correlated with dissolved oxygen (DO). Purification capacity of nutrients in water body is riparian buffer zone > vegetation filter belt > ecological floating island > platform type gabion revetment. Compared with other plant combinations, arbor and shrub community have the highest potential for nutrient purification in water.
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基金项目:住房和城乡建设部科学技术项目(2018-K7-003);江苏省高校自然科学基金资助项目(17KJB220001);江苏省2018年度“青蓝工程”培养对象资助项目;江苏开放大学“十三五”规划课题(17SSW-Z-Z-022)
引用文本:
叶海跃,熊星,谢伟芳.南京生态科技岛海绵城市河道系统植物技术设施对水体重金属及营养盐净化能力评价[J].有色金属(冶炼部分),2021(3):162-173.
Ye Haiyue,Xiong Xing,Xie Weifang.Evaluation on Purification Capacity of Plant Technology Facilities for Heavy Metals and Nutrients in River Course of A Sponge City of Nanjing Eco-technology Island[J].Nonferrous Metals (Extractive Metallurgy),2021(3):162-173.

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