Response of phytoplankton to haze addition in various water layers in the Yellow Sea and the Bohai Sea
ZHANG Yan-song1, WANG Qin1, ZHANG Chao1,2,3, JIN Hao-yu1, GAO Hui-wang1,2,3
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; 2. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; 3. Frontiers Science Center for Deep Ocean Multispheres and Earth System, Qingdao 266100, China
Abstract：The effects of haze on phytoplankton in different water layers were investigated through ship-based containment culture experiments in the South Yellow Sea and Bohai Sea. Surface seawater (Sur) and Deep Chlorophyll Maximum seawater (DCM) were collected and mixed 1:1 in mixed layer seawater (Mix). Ship-based isolation culture experiments were conducted with haze added to seawater in three water layers. The results showed that haze addition could alleviate N limitation in nutrient-poor seawater and promote the growth of phytoplankton. However, under multi-factor limiting conditions, the responses of phytoplankton to haze addition varied significantly. In the southern part of the South Yellow Sea, the response degree of phytoplankton to haze addition was DCM layer > Mix layer ≈ Sur layer due to the increase of N nutrients with depth. In the northern part of the South Yellow Sea, phytoplankton was affected by Si restriction, especially in the surface layer, and the response degree of phytoplankton to haze addition was DCM layer > Mix layer > Sur layer. In the southern Bohai Sea, phytoplankton was affected by light restriction, especially in the deep layer, and the response degree of phytoplankton to haze addition was Sur layer ≈ Mix layer > deep layer. In addition to promoting the growth of phytoplankton, haze addition can also shift the size structure of phytoplankton from small particle size to large particle size. Specifically, the proportion of microsized phytoplankton decreases, while the proportion of nanosized phytoplankton increases because the addition of haze can increase the N/P in seawater. The overall particle size structure of phytoplankton increased, resulting in the decrease of POC/Chl a value in seawater.
张岩松, 王钦, 张潮, 金昊宇, 高会旺. 黄渤海不同水层中浮游植物对灰霾添加的响应[J]. 中国环境科学, 2023, 43(9): 4791-4800.
ZHANG Yan-song, WANG Qin, ZHANG Chao, JIN Hao-yu, GAO Hui-wang. Response of phytoplankton to haze addition in various water layers in the Yellow Sea and the Bohai Sea. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4791-4800.
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