Nitrogen process in stormwater bioretention: the impact of alternate drying and rewetting on nitrogen migration and transformation

Nitrogen migration and transformation in the stormwater bioretention system were studied laboratory experiments, which effects of drying-rewetting particularly investigated. The occurrence distribution nitrogen plants, soil, pore water explored under different cycles. results clearly showed that could remove efficiently all incoming be retained topsoil (0–10 cm) accumulated planted layer. However, overlong dry periods (12 22 days) cause an increase nitrate water. In addition, is mostly stored plants’ stem tissues. Up to 23.26% inflowing can immobilized plant tissues after a period days. relationships between reductase activity soil content explored. TN enhance reductase. Meanwhile, hydroxylamine (HyR) enhanced with NO3? content. These provide reference for future development mechanism construction systems.