李童童, 冯媛媛, 王建才, 等, 2023. 浮游植物种群对海洋酸化和光照强度变化的响应:以长江口南毗邻海域为例[J]. 海洋科学进展, 41(4): 673-687. doi: 10.12362/j.issn.1671-6647.20221011001.
引用本文: 李童童, 冯媛媛, 王建才, 等, 2023. 浮游植物种群对海洋酸化和光照强度变化的响应:以长江口南毗邻海域为例[J]. 海洋科学进展, 41(4): 673-687. doi: 10.12362/j.issn.1671-6647.20221011001.
LI T T, FENG Y Y, WANG J C, et al, 2023. Response of phytoplankton assemblage to ocean acidification and irradiance changes: an example in an area adjacent to the south of the Yangtze River Estuary[J]. Advances in Marine Science, 41(4): 673-687. doi: 10.12362/j.issn.1671-6647.20221011001
Citation: LI T T, FENG Y Y, WANG J C, et al, 2023. Response of phytoplankton assemblage to ocean acidification and irradiance changes: an example in an area adjacent to the south of the Yangtze River Estuary[J]. Advances in Marine Science, 41(4): 673-687. doi: 10.12362/j.issn.1671-6647.20221011001

浮游植物种群对海洋酸化和光照强度变化的响应:以长江口南毗邻海域为例

Response of Phytoplankton Assemblage to Ocean Acidification and Irradiance Changes: an Example in an Area Adjacent to the South of the Yangtze River Estuary

  • 摘要: 光照和CO2均是影响海洋浮游植物生物固碳作用的重要环境因素,并影响与浮游植物相关的海洋碳汇。为了研究长江口南毗邻海域的浑浊带区域浮游植物群落对光照强度变化和海洋酸化及其耦合作用的响应,于2020年5月在长江口南毗邻海域采集水样进行现场船基受控培养实验。结果表明,光照强度在350~1 200 µmol·photons·m−2·s−1范围内升高比酸化更加显著地提升浮游植物群落总叶绿素(Chl a)质量浓度、颗粒有机碳(POC)浓度和颗粒有机氮(PON)浓度。pCO2为101 Pa的酸化条件和光照强度范围在500~1 200 µmol·photons·m−2·s−1的高光条件对POC和颗粒有机磷(POP)浓度具有协同性交互效应,而对总Chl a质量浓度、PON浓度、生物硅(BSi)浓度、元素摩尔比、沉降速率、硅藻以及甲藻丰度产生拮抗性交互效应。研究分析表明不同pCO2(41 Pa和101 Pa)、光照强度变化(350~1 200 µmol·photons·m−2·s−1)可引起浮游植物种群组成改变;高光条件(500~1 200 µmol·photons·m−2·s−1)更有益于中心纲硅藻的生长;酸化(pCO2为101 Pa)明显有利于聚球藻的生长;酸化条件和高光条件均降低了甲藻的丰度,而金藻和蓝藻的丰度在酸化条件下较高;也对浮游植物群落粒径组成产生影响,酸化提升了小型浮游植物生物量占比,同时导致浮游植物群落粒径增大和沉降速率升高,对该海域的碳沉降及缺氧区的形成产生潜在影响。

     

    Abstract: Irradiance and CO2 are both important environmental factors affecting the biological carbon sequestration of marine phytoplankton. In order to study the response of phytoplankton assemblages to ocean acidification (OA) and irradiance changes in the "turbid zone" area adjacent to the south of the Yangtze River Estuary, a shipboard incubation experiment was conducted in May 2020. The results show that the concentrations of total chlorophyll a (Chl a), particulate organic carbon (POC) and particulate organic nitrogen (PON) were increased more significantly by increasing irradiance in the range of 350–1 200 µmol·photons·m−2·s−1 than OA. One hundred and one Pa of pCO2 and irradiance in the range of 500–1200 µmol·photons·m−2·s−1 had synergistic interactive effects on the POC and particulate organic phosphorus (POP) concentrations, while had antagonistic interactive effects on the Chl a concentration, PON , biological silicon (BSi) concentrations, elemental molar ratios, phytoplankton sinking rate and the abundances of diatoms and dinoflagellates. The results further reveal that the change of pCO2 between 41 Pa and 101 Pa, and the irradiance in the range of 350–1200 µmol·photons·m−2·s−1 can cause changes in the species composition of phytoplankton. High light (HL) favored the growth of the centric diatoms, while the abundance of Synechococcus was higher under OA. The abundance of dinoflagellates was decreased under OA and HL, while the abundance of Chrysophyceae and Cyanobacteria were both increased under OA. At the same time, it also hadan impact on the particle size composition of phytoplankton communities, OA significantly increased the percentage of micro-phytoplankton biomass and leads to the increase in both size and the sinking rate of phytoplankton community, thus having potential impacts on the carbon export and the formation of anoxic zones in the Yangtze River Esturay area.

     

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