Impact of atmospheric wet deposition on phytoplankton community structure in the South China Sea

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• 作者：Dong-Yang Cui ; Jiang-Tao Wang ; ^{jtwang@ouc.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Li-Ju Tan ; Ze-Yi Dong
• 关键词：Rainwater inputs ; Phytoplankton community structure ; Chl a size-fractionation ; South China Sea
• 刊名：Estuarine, Coastal and Shelf Science
• 出版年：2016
• 出版时间：5 May 2016
• 年：2016
• 卷：173
• 期：Complete
• 页码：1-8
• 全文大小：751 K

文摘

The South China Sea (SCS), which is the largest marginal sea in East Asia, plays a significant role in regional climate change. However, research on the phytoplankton community structure (PCS) response to atmospheric wet deposition remains inadequate. In this study, field incubation experiments were performed to survey the impact of atmospheric wet deposition on the PCS in the SCS in December 2013. Results indicate that the mean dissolved inorganic nitrogen/dissolved inorganic phosphorous (DIN/DIP) ratio in rainwater was 136, which was higher than that in seawater. Under low initial nutrient concentrations, rainwater inputs not only significantly increased total chlorophyll a (Chl a) concentrations but also potentially altered the PCS. The total Chl a concentration increased 1.7-, 1.9-, and 1.6-fold; microphytoplankton increased 2.6-, 3.2-, and 1.7-fold with respect to their initial values in the 5%, 10% addition, and 10% addition (filtered) treatment samples, respectively. Finally, microphytoplankton contributed 61% to the total Chl a concentration in 10% addition treatment samples. Differences in the nutrients induced by atmospheric wet deposition resulted in a shift in the advantage from picophytoplankton to microphytoplankton. Diatoms became the predominant species, accounting for 55% of the total abundance after rainwater addition.