Abstract：
Phosphorus (P) is a vital nutrient for the growth of marine organisms. Tidal cycle had major influence on various biogeochemical parameters of the bay and changed nutrients input with the ebb and flow of the tide. Seawater was collected by synchronous continuous observation during summer in 2021, to investigate tide drives total phosphorus (TP) variation on the concentration, speciation and exchange flux between Shuidong Bay (SDB) and South China Sea (SCS). Results indicated that there was significant tidal variation in exchange flux of TP between SDB and SCS. DIP and DOP were the main speciation of TDP in different tidal periods, accounting for 53.9 % and 46.1 %TP flowed from SCS to SDB, and monthly exchange flux was about 21.26 t. This study provides new insights in P tidal cycling across the semi-enclosed bay-coastal water continuum, which was implications for understanding P biogeochemical process and primary production dynamics in coastal water.
摘要：
磷（P）是海洋生物生长的重要营养素。潮汐循环对海湾的各种生物地球化学参数有重大影响，并且随着潮汐的涨落而改变了养分的输入。在2021年夏季通过同步连续观测收集海水，以调查潮汐驱动对总磷（TP）浓度变化的影响，水东湾(SDB)与南海(SCS)之间的物种形成和交换通量。结果表明，SDB和SCS之间的TP交换通量存在显着的潮汐变化。DIP和DOP是不同潮汐时期TDP的主要形态，占53.9%和46.1%的TP从SCS流向SDB，每月交换通量约为21.26t。这项研究为半封闭海湾-沿海水连续体的P潮汐循环提供了新的见解，这对理解沿海水域中磷的生物地球化学过程和初级生产动态具有重要意义。
