Revetment Affects Nitrogen Removal and N 2 O Emission at the Urban River–Riparian Interface

Zihao Man, Changkun Xie, Ruiyuan Jiang, Jin Wang, Yifeng Qin and Shengquan Che ()
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Zihao Man: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Changkun Xie: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Ruiyuan Jiang: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Jin Wang: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Yifeng Qin: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China
Shengquan Che: School of Design, Shanghai Jiao Tong University, Shanghai 200240, China

Land, 2024, vol. 13, issue 8, 1-20

Abstract: River–riparian interface (RRI) plays a crucial role in nitrogen removal and N 2 O emissions, but different revetment constructions can significantly alter the associated outcomes. Identifying which type of revetment can reduce N 2 O emissions while still removing nitrogen is a key issue in urban development. This study constructed three types of revetments along the same river section, and measured soil, vegetation, microbial, denitrification, and N 2 O emission characteristics to explore the synergistic effects of revetment types on nitrogen removal and N 2 O emissions. The study showed that revetments affected nitrogen removal and N 2 O emissions in RRI by influencing denitrification. nirK mainly affected nitrogen removal, while nosZII mainly influenced N 2 O emissions. Environmental factors in the permeable revetment led to significantly higher gene abundances of nirK and nosZII compared to those in the natural and impermeable revetments. As a result, the denitrification potential of the permeable revetment (34.32 ± 1.17 mg/(kg·d)) was 22.43% and 8.84% higher than those of the natural and impermeable revetments, respectively. The N 2 O emission rate (0.35 ± 0.01 mg/(m 2 ·h)) was 29.22% and 22.19% lower than those of the natural and impermeable revetments, respectively. Permeable revetment could have been the best for the nitrogen removal and N 2 O emission reduction. These results provide a theoretical basis and guidance for urban ecological construction.

Keywords: revetment; river–riparian interface; denitrification; N 2 O emissions; climate change (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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