不同类型生物滞留设施土壤介质层氮磷分布特征分析  

DISTRIBUTION CHARACTERISTICS OF NITROGEN AND PHOSPHORUS IN SOIL MEDIUM LAYER IN DIFFERENT TYPES OF BIORETENTION FACILITIES

作　　者：袁绍春 杨孟颖 陈茜[3] 杨清伟[1] 吕波 YUAN Shaochun;YANG Mengying;CHEN Xi;YANG Qingwei;LV Bo(Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education,Chongqing Jiaotong University,Chongqing 400074,China;Engineering Research Center for Sponge City Construction of Chongqing,Chongqing 400020,China;Chongqing Engineering Laboratory of Environmental Hydraulic Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Academy of Science and Technology,Chongqing 401123,China)

机构地区：[1]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [2]重庆市海绵城市建设工程技术研究中心,重庆400020 [3]重庆交通大学环境水利工程重庆市工程实验室,重庆400074 [4]重庆市科学技术研究院,重庆401123

出　　处：《环境工程》2024年第5期131-138,共8页Environmental Engineering

基　　金：重庆市自然科学基金(cstc2020jcyj-msxmX1000);重庆市建设科技计划项目(城科字2020第5-7)。

摘　　要：为探明实际工程中生物滞留设施的N、P累积状况,以重庆市悦来海绵城市试点的典型生物滞留设施为研究对象,考察土壤介质不同深度TN、NH+4-N、NO_(3)^(-)-N、TP、有效磷(AP)含量,研究介质层氮磷分布规律。结果表明:生态树池、雨水花园、生物滞留带、高位花坛设施中TN、TP在表层土壤(0~10 cm)中的含量最高,并随着深度增加呈逐渐降低趋势,其中雨水花园表层土壤TN含量最高,达到885 mg/kg;NH+4-N主要分布于中层土壤,约占总含量的28%;不同土层NO_(3)^(-)-N含量差异较小,为0.31~1.25 mg/kg。含水率(WC)会影响土壤介质NO_(3)^(-)-N和AP的分布,其中生态树池中上层土壤NO_(3)^(-)-N含量与含水率(WC)在0.05水平上呈显著负相关,较高的WC有利于减少土壤NO_(3)^(-)-N累积量;pH对土壤介质NO_(3)^(-)-N、TN、TP、AP的分布均有一定影响,其中,NO_(3)^(-)-N、AP含量与pH呈负相关,较高的pH有利于减少土壤NO_(3)^(-)-N、AP累积量。To explore the accumulation of nitrogen and phosphorus in bioretention facilities in practical projects,four types of typical bioretention facilities in the Yuelai Sponge City in Chongqing were taken as research objects to investigate the contents of TN,NH~+_4-N,NO_(3)^(-)-N,TP and available phosphorus(AP)at different depths of soil media,and study the distribution of nitrogen and phosphorus in the medium layer.The results showed that the contents of TN and TP in the surface soil(0 to 10 cm)of ecological tree pond,rain garden,biological retention zone and biological parterre were the highest.In particular,the contents of TN in the surface soil of rain gardens were the highest,reaching 885 mg/kg.NH~+_4-N was mainly distributed in the middle layer of soil,accounting for about 28%of the total content.NO_(3)^(-)-N content in different soil layers had little difference and fluctuated in the range of 0.31~1.25 mg/kg.Water content(WC)can affect the distribution of NO_(3)^(-)-N and AP in soil,and NO_(3)^(-)-N content in the middle and upper soil of ecological tree pool was significantly negatively correlated with WC at the level of 0.05,and higher water content can weaken the accumulation of NO_(3)^(-)-N.pH effected the distribution of NO_(3)^(-)-N,TP,TN and AP in soil,and the contents of AP and NO_(3)^(-)-N in soil were negatively correlated with pH.Higher pH can reduce the accumulation of NO_(3)^(-)-N and AP in soil.

关 键 词：氮、磷浓度 生物滞留设施 分布特征 土壤介质 含水率 

分 类 号：X52[环境科学与工程—环境工程]