涠洲岛珊瑚礁区沉积物硝酸盐异化还原过程对温度变化的响应

doi:10.11978/2023108

Abstract

Abstract:

Dissimilatory nitrate reduction processes, including denitrification, anaerobic ammonium oxidation, and dissimilatory nitrate reduction to ammonium (DNRA) regulate the removal and retention of nitrogen elements in the ocean. Global warming affecting the nitrogen cycling processes in sediments, but it is not yet clear the differences in response of dissimilatory nitrate reduction processes in carbonate sand and silicate sand sediments to increased temperature. Therefore, we used ¹⁵N isotope tracing technology and temperature-controlled incubation of sediments to investigate the response of dissimilatory nitrate reduction processes in different sediment types in the coral reef area of the Weizhou Island to increased temperature. The results indicate that DNRA and denitrification processes exhibited significant differences in response to increased temperature in two different types of sediments. The rates of denitrification and DNRA in silicate sand were significantly increased with the increased temperature, but those in carbonate sand exhibited opposite trend, which may be related to differences in microbial community in different sediments. Due to anaerobic ammonium oxidation process being more sensitive to increased temperature, the contribution of denitrification to nitrogen removal increased, but its byproduct N₂O may have a negative impact on climate. In addition, the increase in temperature led to an increase in the contribution of DNRA to nitrate dissimilation reduction, which will exacerbate the negative impact of nitrogen excess on the coral reef ecosystem of the Weizhou Island.

Key words: denitrification, increased temperature, DNRA, sediments, coral reef

MO Danyang, NING Zhiming, YANG Bin, XIA Ronglin, LIU Zhijin. Response of dissimilatory nitrate reduction processes in coral reef sediments of the Weizhou island to temperature changes[J].Journal of Tropical Oceanography, 2024, 43(4): 137-143.

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References 27

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Response of dissimilatory nitrate reduction processes in coral reef sediments of the Weizhou island to temperature changes

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