College of Chemistry and Environmental Science, Guangdong Ocean University, Guangdong, Zhanjiang 524088, China.
College of Chemistry and Environmental Science, Guangdong Ocean University, Guangdong, Zhanjiang 524088, China; Guangzhou Chinese Academy of Sciences Test Technical Services, Co., Ltd., Guangdong, Guangzhou 510000, China.
Mar Pollut Bull. 2021 Jun;167:112284. doi: 10.1016/j.marpolbul.2021.112284. Epub 2021 Mar 23.
Phosphorus (P) plays key role in phytoplankton primary production in coastal water. In this study, seawater samples collected within China's Leizhou Peninsula coastal waters from October 2017 to July 2018 were examined to determine the seasonal variation, speciation, and transport flux of total dissolved phosphorus (TDP) linked to hydrographic features. TDP concentration and speciation had significant seasonal variations (P < 0.01), and the annual mean TDP concentration was 0.42 ± 0.25 μmol·L. High concentrations of TDP occurred in coastal waters adjacent to Zhanjiang Bay and Jianjiang River estuary, whereas low TDP concentrations were found across large offshore areas. Dissolved inorganic and organic P were the main TDP bulk species in different seasons, comprising up to 55.5 ± 7.9% and 46.5 ± 22.6%, respectively. The Beibu Gulf was annually subjected to 3.5 × 10 mol flux of TDP through the Qiongzhou Strait. Coastal currents, river plumes, and human activities were responsible for the dynamic variations in P species.
磷（P）在沿海水域浮游植物的初级生产中起着关键作用。本研究于 2017 年 10 月至 2018 年 7 月期间采集了中国雷州半岛沿海海域的海水样本，以检测与水文学特征相关的总溶解磷（TDP）的季节性变化、形态和传输通量。TDP 浓度和形态具有显著的季节性变化（P<0.01），年平均 TDP 浓度为 0.42±0.25μmol·L。高浓度的 TDP 出现在湛江湾和鉴江河口附近的沿海海域，而在大面积的近海区域则发现了低浓度的 TDP。在不同季节中，溶解无机磷和有机磷是 TDP 的主要形态，分别占 55.5±7.9%和 46.5±22.6%。北部湾每年通过琼州海峡输送 3.5×10mol 的 TDP。沿岸流、河流羽流和人类活动是 P 形态动态变化的原因。
