Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266100, China.
Mar Pollut Bull. 2020 Nov;160:111628. doi: 10.1016/j.marpolbul.2020.111628. Epub 2020 Sep 12.
This paper presents an incubation experiment with sediment cores from the Changjiang Estuary Mud Area (CEMA) to quantify the release of nutrients due to simulated resuspension. The results show that except for nitrate (NO-N), phosphate (PO-P), ammonium (NH-N), nitrite (NO-N) and silicate (SiO-Si) were released from the sediment to the overlying water, primarily due to desorption (P), dissolution (SiO-Si) and mineralization (NH-N) with only minor direct contributions from the sediment pore water. The significant release of nutrients by resuspension and subsequent processes can alleviate the phosphorus and silicon limitation in water bodies, enhance the growth of phytoplankton, and thus promote the oxygen consumption and ultimately lead to hypoxia. The results of this study are highly relevant for many coastal areas in other parts of the world with large amounts of stored organic matter and nutrients in sediments and frequent perturbation by storm events.
本文通过对长江口泥区（CEMA）沉积物岩芯进行培养实验，定量研究了再悬浮作用导致的营养盐释放。结果表明，除硝酸盐（NO-N）外，磷（PO-P）、铵（NH-N）、亚硝酸盐（NO-N）和硅酸盐（SiO-Si）均从沉积物释放到上覆水中，主要通过解吸（P）、溶解（SiO-Si）和矿化（NH-N），而沉积物孔隙水中的直接贡献较小。再悬浮和随后的过程中营养盐的大量释放可以减轻水体中的磷和硅限制，促进浮游植物的生长，从而增加耗氧量，最终导致缺氧。本研究结果对世界其他许多沿海地区具有重要意义，这些地区沉积物中储存了大量的有机物质和营养物质，并且经常受到风暴事件的干扰。
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