Influence of Concentrated Infiltration on Soil N, P, Organic Carbon and Heavy Metals in Urban Rain Gardens

Guo Chao; Xie Xiao; Li Jiake

doi:10.13961/j.cnki.stbctb.2022.01.004

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Influence of Concentrated Infiltration on Soil N, P, Organic Carbon and Heavy Metals in Urban Rain Gardens

- Influence of Concentrated Infiltration on Soil N, P, Organic Carbon and Heavy Metals in Urban Rain Gardens
- Bulletin of Soiland Water Conservation Vol. 42, Issue 1, Pages: 26-33(2022)
- 作者机构：
  
  1. 陕西省土地工程建设集团自然资源部退化及未利用土地整治工程重点实验室,陕西,西安,710075
  2. 陕西省土地工程建设集团陕西省土地整治工程技术研究中心,陕西,西安,710075
  3. 陕西省土地工程建设集团自然资源部土地工程技术创新中心,陕西,西安,710075
  4. 西安理工大学水利水电学院,陕西,西安,710048
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.01.004
  CLC： X53
- Published：2022
- 稿件说明：
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Guo Chao, Xie Xiao, Li Jiake. Influence of Concentrated Infiltration on Soil N, P, Organic Carbon and Heavy Metals in Urban Rain Gardens[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 26-33.
DOI：

Guo Chao, Xie Xiao, Li Jiake. Influence of Concentrated Infiltration on Soil N, P, Organic Carbon and Heavy Metals in Urban Rain Gardens[J]. Bulletin of Soiland Water Conservation, 2022, 42(1): 26-33. DOI： 10.13961/j.cnki.stbctb.2022.01.004.

摘要

[目的

]

研究陕西省西安市雨水花园集中入渗对土壤污染的影响，为城市雨水径流集中入渗工程技术的合理配置与推广应用提供科学依据。[方法

]

以西安理工大学校园内运行8～9 a的2个雨水花园(RD

：受纳屋面径流雨水；RD

：受纳路面和屋面径流的混合雨水)为研究对象。2016—2018年对雨水花园RD

和RD

监测了16～18场降雨事件，确定其径流中化学需氧量(COD)，总悬浮物(TSS)，N，P，重金属的EMC浓度和雨水花园单位面积受纳污染物负荷量。2017年4月至2019年2月，采集7次花园内不同土层深度处的土样，测定土壤中NH

-N，NO

-N，TN，TP，总有机碳(TOC)及Cu，Zn，Cd含量，明确其在土壤垂向上的分布规律。[结果

]

径流中COD，TSS，NH

-N，TN，TP的EMC浓度均大于RD

，而重金属小于RD

。土壤NH

-N和TN含量随土层深度增加逐渐减小；NO

-N和TP含量随土层深度增加逐渐增大，50 cm以下不同深度土壤NO

-N和TP含量大多大于0—50 cm土层。TOC含量随土层深度逐渐减小。0—30 cm土壤重金属含量较高，Cu和Zn主要以铁—锰氧化物结合态和残渣态形式存在，而Cd主要以可交换态和碳酸盐结合态形式存在，雨水花园土壤重金属Cu，Zn，Cd与TOC具有较好的拟合关系(R

>0.8)。[结论

]

雨水花园集中入渗对土壤氮、磷、重金属有一定的影响，NO

-N和TP发生了淋溶，土壤NH

-N和TN主要富集在0—50 cm土层，重金属主要富集在0—30 cm土层。

Abstract

[Objective] The influence of concentrated infiltration from rainfall runoff on soil of rain gardens in Xi’an City

Shaanxi Province was studied in order to provide a scientific reference for the reasonable configuration and application of concentrated infiltration technology of urban rainfall runoff. [Methods] Runoff data from two rain garden treatments (RD1: accepting roof rainfall runoff; RD2: accepting roof and road rainfall runoff) was acquired from 8—9 years on the campus of Xi’an University of Technology. From 2016 to 2018

16—18 rainfall events were monitored to determine the pollutant load of chemical oxygen demand (COD)

total suspended solids (TSS)

and the event mean concentration (EMC) of heavy metals in the rainfall runoff of the two rain gardens. From April 2017 to February 2019

a total of seven soil samples at different soil depths in the two gardens were collected to determine NH4-N

NO3-N

total organic carbon (TOC)

and heavy metals (Cu

and Cd) to assess the vertical distribution of N

TOC

and heavy metal contents in the rain garden soils. [Results] The EMC concentrations of COD

TSS

NH4-N

and TP in RD1 were all greater than those in RD2

but opposite results were obtained with regard to heavy metals. The contents of NH4-N and TN showed a gradually decreasing trend with soil depth. However

the contents of NO3-N and TP in the soil gradually increased with soil depth

and they were all greater below 50 cm than the contents in the upper layer (0—50 cm). The TOC content in the rain garden soil showed a gradually decreasing trend with soil depth. Heavy metal contents were large in the 0—30 cm soil layer. Cu and Zn mainly existed in the form of iron-manganese oxide bound state and residue state

while Cd mainly existed in the form of exchangeable and carbonate-bound forms. The contents of Cu

and Cd in rain garden soil had good relationships with TOC (R2>0.8). [Conclusion] Concentrated infiltration in rain gardens had a clear influence on soil N

and heavy metals. NO3-N and TP leaching occurred in rain garden soil. The contents of NH4-N and TN in rain garden soil were mainly concentrated in the 0—50 cm soil layer

while heavy metals were mainly concentrated in the 0—30 cm layer.

关键词

Keywords

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