沉积物再悬浮对长江口潮滩上覆水体脱氮过程的影响

doi:10.3969/j.issn.1000-5641.201941007

摘要/Abstract

摘要： 以长江口潮滩作为研究区域，采用¹⁵N同位素示踪技术，模拟研究了沉积物再悬浮过程对水体反硝化和厌氧氨氧化的影响. 结果表明，沉积物再悬浮引起的上覆水体反硝化和厌氧氨氧化速率与水体浊度呈显著的正相关关系，这说明沉积物再悬浮能够促进水体脱氮过程的发生. 在沉积物再悬浮条件下，采样点反硝化与厌氧氨氧化速率受不同站位理化因素的影响，存在明显的空间差异，且主要受沉积物总有机碳含量的控制. 此外，随着沉积物再悬浮浊度的增加，水体中反硝化细菌nirS基因与厌氧氨氧化细菌16S rRNA基因丰度均呈增加趋势. 这说明沉积物再悬浮可增加水体脱氮功能菌群的丰度，进而增加脱氮速率. 研究结果表明，评价河口潮滩沉积物再悬浮对氮转化过程的影响具有重要的科学意义.

关键词: 再悬浮, 浊度, 反硝化, 厌氧氨氧化

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

中图分类号:

张红丽, 尹国宇, 郑艳玲, 高娟, 高灯州, 常永凯, 刘程. 沉积物再悬浮对长江口潮滩上覆水体脱氮过程的影响[J]. 华东师范大学学报（自然科学版）, 2020, 2020(3): 78-87.

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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