| 基于核密度估计的城市基础要素与街尘营养元素含量特征关联 |
| 摘要点击 1771 全文点击 577 投稿时间：2021-06-07 修订日期：2021-06-25 |
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| 中文关键词 街尘 城市基础要素 营养元素 非点源污染 核密度估计 兴趣点(POI) 路网 |
| 英文关键词 road-deposited sediment urban basic elements nutrients nonpoint source pollution kernel density estimation point of interest (POI) road network |
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| 中文摘要 |
| 了解城市基础要素与街尘污染物在空间上的关联特征有利于城市非点源污染源区的定量解释及精准控制.为探究城市基础要素与街尘营养元素含量空间分布之间的联系，以武汉市汉阳区为案例研究区，选取总氮（TN）、总磷（TP）、交换态磷（Ex-P）、铝结合态磷（Al-P）、铁结合态磷（Fe-P）、闭蓄态磷（Oc-P）、钙结合态磷（Ca-P）、碎屑态磷（De-P）和有机态磷（Or-P）作为典型污染物指标，利用7大类兴趣点（point of interest，POI）及路网核密度表征城市基础要素的空间分布状态，通过相关分析，探讨城市基础要素与街尘营养元素含量之间的关联特征.结果表明，汉阳区街尘中营养元素含量表现出明显的空间变异性，其中，Al-P、Oc-P和Or-P含量的空间变异性普遍较Ex-P和Fe-P含量的空间变异性大，而Ca-P和De-P含量的空间变异性则随街尘粒径的变化而有所差异.各类城市基础要素核密度均与街尘营养元素含量表现出不同程度的相关性.其中，Ex-P、Al-P、Oc-P和Or-P普遍与各类城市基础要素核密度呈现出负相关关系，而TN、TP、Fe-P、Ca-P以及De-P则大体上与各类城市基础要素核密度表现出正相关关系.相对而言，TN、Al-P、Fe-P、Ca-P和Or-P与各类城市基础要素核密度之间的相关性较其余几种污染物强，但各污染物与城市基础要素核密度之间的相关性随街尘粒径变化而有所差异，总体表现为街尘营养元素含量与各类城市基础要素核密度之间的相关性在街尘粒径<450 μm时体现得更为明显，而在粒径<150 μm时表现得更为稳健. |
| 英文摘要 |
| Understanding the spatial connection between urban basic elements and pollutants in road-deposited sediment (RDS) is beneficial to the quantitative explanation of source areas and the precise management of urban nonpoint source pollution. The objective of this study was to explore the spatial connection between urban basic elements and nutrient contents in RDS, using Hanyang district of Wuhan city as a case study area. Total nitrogen (TN), total phosphorus (TP), exchangeable phosphorus (Ex-P), aluminum-bound phosphorus (Al-P), iron-bound phosphorus (Fe-P), occluded phosphorus (Oc-P), apatite phosphorus (Ca-P), detrital apatite phosphorus (De-P), and organophosphorus (Or-P) were chosen as representative pollutants, using the kernel density of the road network and seven groups of points of interest to represent the spatial distribution of urban basic elements. Through correlation analysis, the relationship between urban basic elements and nutrient contents in RDS was examined. The results showed that nutrient contents in RDS from Hanyang varied significantly with location. Specifically, Al-P, Oc-P, and Or-P had greater spatial variability in contrast with that of Ex-P and Fe-P, and the spatial variabilities of Ca-P and De-P both varied considerably with the particle size of the RDS. All types of urban basic elements and nutrient contents in RDS were correlated to different extents. Ex-P, Al-P, Oc-P, and Or-P were negatively correlated with the kernel density of most urban basic elements, whereas TN, TP, Fe-P, Ca-P, and De-P showed a positive correlation with the kernel density of most urban basic elements. TN, Al-P, Fe-P, Ca-P, and Or-P appeared to have much stronger correlation with the kernel density of urban basic elements compared to other selected pollutants, whereas the extent of correlation between them was influenced by the particle size of the RDS. In general, the correlation between nutrient contents in RDS and the kernel density of urban basic elements was more significant when the particle size of the RDS was under 450 μm and more robust when the particle size of the RDS was under 150 μm. |
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