Responses of phytoplankton to dust and haze particle additions in the South China Sea
MU Ying-chun1, CHU Qiang1, ZHANG Chao1, HE Jing-yi1, GAO Hui-wang1,2
1. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
On-board incubation experiments were conducted at three sampling stations from May to June 2016 in the South China Sea (SCS) to explore the impact of dust and haze addition on phytoplankton biomass and community structure. By providing the nutrients such as N and P, the addition of dust and haze in general promoted the growth of phytoplankton, and the promotion magnitude is tightly related to the amount of dust and haze addition. By calculation of nutrient index and chlorophyll a cumulative concentration, it was found that the accumulated chlorophyll a during the incubation experiment showed statistically significant positive correlation with the amount of added dust (R2=0.87, P<0.01); In terms of the dust, similar promotion mechanism was found when the haze concentration was low (R2=0.91, P<0.01). However, when the haze concentration continued to increase, the accumulation of chlorophyll a was hindered to some extent, likely an effect of the high content of toxic substances in haze. Size-fraction chlorophyll a showed that the addition of dust and low concentration of haze facilitated that the transition of dominant phytoplankton species from pico-sized phytoplankton to micro-and nano-sized phytoplankton, while the synthetic effect of nutrients and toxic substance, resulting from the addition of high haze concentration, yielded no obvious effect on the size structure of phytoplankton. The pico-sized phytoplankton abundance tests showed that the dust addition promoted the development of all three species including Synechococcus, Prochlorococcus and picoeukaryotes, whereas the addition of high concentration haze addition may inhibit the growth of Synechococcus and picoeukaryotes.
牟英春, 褚强, 张潮, 贺敬怡, 高会旺. 南海浮游植物对沙尘和灰霾添加的响应[J]. 中国环境科学, 2018, 38(9): 3512-3523.
MU Ying-chun, CHU Qiang, ZHANG Chao, HE Jing-yi, GAO Hui-wang. Responses of phytoplankton to dust and haze particle additions in the South China Sea. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3512-3523.
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