南海浮游植物对沙尘和灰霾添加的响应

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Abstract

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.

Key words： dust haze South China Sea phytoplankton inhibition promotion

Received: 29 January 2018

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	Articles by authors
	MU Ying-chun
	CHU Qiang
	ZHANG Chao
	HE Jing-yi
	GAO Hui-wang

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MU Ying-chun,CHU Qiang,ZHANG Chao等. Responses of phytoplankton to dust and haze particle additions in the South China Sea[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3512-3523.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I9/3512

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