Phosphorus Enrichment and Morphological Characteristics of Bioretention Facilities in Mountainous Cities
Biodetention facilities are important rainwater management facilities in urban ecosystems,widely used in sponge city construction nationwide due to their purification effect on pollutants in rainwater runoff.Biodetention facilities with a construction time of more than 5 years were taken as objects.The enrichment and morphology of phosphorus pollutants in bioretention facilities were analyzed by means of on-site sampling,detection and analysis,so as to grasp their accumulation,distribution and morphological transformation.The results showed that the total phosphorus in the biological retention zone ranged from 0.36 g/kg to 0.76 g/kg.The pollutant content in the biological retention zone on different types of urban roads varied greatly.Phosphorus pollutants in the under-construction area and urban traffic road biological retention zone were mainly enriched in the surface layer of soil depth of 0～10 cm,with concentrations of 0.81 g/kg and 0.49 g/kg,respectively.The accumulation of phosphorus on roads in construction areas,residential areas,and commercial areas was significantly higher than on urban transportation roads,and the vertical distribution of phosphorus was mainly enriched at depths of 0～10 cm in the bioretention facilities.The phosphorus forms were mainly in the form of calcium phosphorus(Ca-P)and organic phosphorus within biological retention facilities.The transformation pathway of its form was from organic phosphorus to inorganic phosphorus,especially the transformation of exchangeable phosphorus,and phosphorus in different regions has similar enrichment and transformation patterns.
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