Response of nitrogen removal in the overlying water to sediment resuspension in the intertidal wetlands of the Yangtze Estuary

doi:10.3969/j.issn.1000-5641.201941007

Abstract

Abstract: The ¹⁵N isotope tracer technique was used to examine the response of denitrification and anammox to sediment resuspension in the intertidal wetlands of the Yangtze Estuary. The results showed that both denitrification and anammox rates were positively correlated with the turbidity of the overlying water, which demonstrates that sediment resuspension can promote the occurrence of nitrogen removal processes in overlying water. The denitrification and anammox rates showed significant spatial differences due to the physiochemical characteristics at different sites under sediment resuspension and was mainly attributed to the sediment TOC contents. In addition, the abundance of nirS and anammox bacterial 16S rRNA genes increased with suspended sediment turbidity, which indicates that sediment resuspension could increase the abundance of nitrogen removal functional bacteria, thus promoting nitrogen removal rates. These results indicate that sediment resuspension has important influence on nitrogen transformation processes and facilitates nitrogen removal in intertidal wetlands.

Key words: resuspension, turbidity, denitrification, anammox

CLC Number:

ZHANG Hongli, YIN Guoyu, ZHENG Yanling, GAO Juan, GAO Dengzhou, CHANG Yongkai, LIU Cheng. Response of nitrogen removal in the overlying water to sediment resuspension in the intertidal wetlands of the Yangtze Estuary[J]. Journal of East China Normal University(Natural Science), 2020, 2020(3): 78-87.

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