Weakened fertilization impact of anthropogenic aerosols on marine phytoplankton—A comparative analysis of dust and haze particles
Weakened fertilization impact of anthropogenic aerosols on marine phytoplankton—A comparative analysis of dust and haze particles
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人为气溶胶对海洋浮游植物的施肥影响减弱——灰尘和霾颗粒物的对比分析
DOI：
10.1016/j.ecoenv.2022.113162
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发表时间：
2022
影响因子：
6.8
通讯作者：
Huiwang Gao
中科院分区：
文献类型：
--
作者：
Chao Zhang;Qiang Chu;Mu Yingchun;Xiaohong Yao;Huiwang Gao
虽然空气污染物的增加正在改变大气的化学组成，但由此对海洋生物地球化学的影响仍然难以捉摸。我们进行了一个集体分析的12个微观宇宙的实验数据有关的治疗尘埃颗粒（DP，通常是矿物气溶胶），雾霾颗粒（HP，通常是人为的气溶胶），和各种营养物质在不同的营养海水的西北太平洋。DP和HP的加入通常刺激浮游植物的生长，如总叶绿素（Chla）所示，并将浮游植物的大小结构向更大的细胞（细胞大小> 2 µm）转移，如尺寸分级Chla所示。我们进一步发现，DP/HP衍生的Chla相对于对照（RCChla）的增加与DP/HP提供的氮（N）相对于海水中基线N浓度（PSN）的比例成正比，并且当PSN超过~ 480%时高于单独N处理。溶解性有机磷利用率的提高可能有助于DP/HP的刺激。DP处理的RCChla和PSN拟合直线的斜率（0.14）大于HP处理（0.11）。当颗粒负荷极高（2 mg L-1）时，HP的加入对浮游植物表现出明显的抑制作用，并不利于浮游植物的尺寸结构向大型细胞的转变。这些结果表明，HPs对浮游植物的影响是营养盐刺激和有毒物质抑制的综合结果，可能通过调节浮游植物的生物量和大小结构来影响海洋固碳效率。
Although increases in air pollutants are changing chemical compositions of atmosphere, the resultant impacts on marine biogeochemistry remains elusive. We performed a collective analysis of 12 microcosm experimental data concerning treatments of dust particles (DPs, typically mineral aerosols), haze particles (HPs, typically anthropogenic aerosols), and various nutrients in varying trophic seawaters of the Northwest Pacific Ocean. The addition of DPs and HPs generally stimulated phytoplankton growth, as indicated by total chlorophylla(Chla), and shifted the phytoplankton size structure towards larger cells (> 2 µm in cell size), as indicated by size-fractionated Chla. We further found that DP/HP-derived Chlaincrease relative to the control (RCChla) was proportional to the proportion of nitrogen (N) supplied by DPs/HPs relative to the baseline N concentration in seawater (PSN) and was higher than that in the N alone treatment when the PSNexceeded ~480%. The enhanced utilization of dissolved organic P potentially contributed to the stimulation of DPs/HPs. The slope of fitted line based on RCChlaand PSNin the DP treatments (0.14) was higher than that in the HP treatments (0.11). When the particle loading was extremely high (2 mg L−1), the addition of HPs exhibited an obvious inhibition impact on phytoplankton and was adverse to the shift of the size structure towards larger cells. These results suggest that the impact of HPs on phytoplankton is a composite result of stimulation by nutrients and inhibition by toxic matter, which may affect carbon sequestration efficiency in the ocean by regulating phytoplankton biomass and size structure.