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.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266100, China.
Mar Environ Res. 2024 Jun;198:106473. doi: 10.1016/j.marenvres.2024.106473. Epub 2024 Mar 23.
In this study, we investigated the hydrological and ecological impacts of heavy rainfall caused by the storm Rumbia and Typhoon Lekima on Laizhou Bay (LZB) through land‒sea synchronous field surveys, online remote sensors, and simulated enclosure experiments. Within two weeks of Rumbia, approximately 9% and 16% of the annual riverine total nitrogen (TN) and total phosphorus (TP) fluxes, respectively, were transported to the LZB and the proportions were 17% and 35%, respectively, for Lekima. The land use on the watersheds increased the rates of land-derived nutrient loading and altered their biogeochemical forms. Consequently, the average concentrations of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) in the LZB increased by 2.6 and 1.0 times post-Rumbia and by 3.5 and 1.3 times post-Lekima, respectively. Relatively lower salinity and temperature, sudden increases in DIN, and strengthened coastal currents stimulated the growth of highly adaptable and small diatoms, resulting in the first diatom blooms. Subsequently, a bloom of Noctiluca scintillans formed.
在这项研究中，我们通过陆海同步实地调查、在线远程传感器和模拟围隔实验，研究了风暴“伦比亚”和台风“利奇马”引发的强降雨对莱州湾的水文和生态影响。伦比亚过境两周内，约有 9%和 16%的年河流总氮（TN）和总磷（TP）通量分别被输送到莱州湾，而利奇马的比例分别为 17%和 35%。流域土地利用增加了陆源营养盐的输入速率，并改变了它们的生物地球化学形态。结果，莱州湾溶解无机氮（DIN）和溶解无机磷（DIP）的平均浓度分别增加了 2.6 倍和 1.0 倍，利奇马过境后分别增加了 3.5 倍和 1.3 倍。相对较低的盐度和温度、DIN 的突然增加以及加强的沿岸流刺激了高度适应和小型硅藻的生长，导致首次硅藻水华的形成。随后，夜光藻形成了水华。
