Storm-induced sediment resuspension in the Changjiang River Estuary leads to alleviation of phosphorus limitation
Storm-induced sediment resuspension in the Changjiang River Estuary leads to alleviation of phosphorus limitation
复制标题
长江口风暴引起沉积物再悬浮缓解磷限制
DOI：
10.1016/j.marpolbul.2020.111628
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发表时间：
2020
影响因子：
5.8
通讯作者：
Panpan Wang
中科院分区：
文献类型：
--
作者：
Mengfan Wu;Fuxia Yang;Qingzhen Yao;Lex Bouwman;Panpan Wang
本文采用长江口泥区沉积物岩心进行孵育实验，量化模拟再悬浮过程中营养物质的释放。结果表明：沉积物除硝酸盐（NO3−-N）外，磷酸盐（PO43−-P）、铵盐（NH4+-N）、亚硝酸盐（NO2−-N）和硅酸盐（SiO32−-Si）主要通过解吸(P)、溶解（SiO32−-Si）和矿化（NH4+-N）向上覆水体释放，孔隙水的直接贡献较小；通过再悬浮及其后续过程大量释放养分，可以缓解水体中磷硅的限制，促进浮游植物的生长，从而促进氧气消耗，最终导致缺氧。这项研究的结果与世界其他地区的许多沿海地区高度相关，这些地区的沉积物中储存了大量的有机物和营养物质，并且经常受到风暴事件的扰动。
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 (NO3−-N), phosphate (PO43−-P), ammonium (NH4+-N), nitrite (NO2−-N) and silicate (SiO32−-Si) were released from the sediment to the overlying water, primarily due to desorption (P), dissolution (SiO32−-Si) and mineralization (NH4+-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.