The distribution and benthic flux of dissolved inorganic phosphate at the sediment-water interface in Meishan bay and the estuary
LOU Qiaoting
MAO Shuoqian
ZHANG Mei
ZHOU Qiang
LIN Zhongzhou
HE Congying
Abstract：In this study,we investigated the abundance and distribution of dissolved inorganic phosphor-us(DIP)in Meishan bay.We collected water samples from the bay and its sediments(16 stations in the bay and the cecum segment)as well as the input rivers(15 stations in estuaries entering the bay)during the summer of 2019.The dissolved inorganic phosphate was mainly analyzed to reveal the spa-tial distribution characteristics in the surface water,overlying water,and sediment pore water in Meis-han bay and the estuary.Our results showed that the content of dissolved inorganic phosphorus in the estuary and cecum of Meishan bay was generally higher than that in the bay implying riverine transpor-tation as a possibly major external source of phosphorus.Moreover,the P levels in the sediment pore water of the estuary and cecum were overall higher than the overlying water.Our estimation using Fick's First Law showed that the dissolved inorganic phosphorus would tend to diffuse from the sedi-ment to the overlying water,and the average diffusion flux was on average 0.39 μmol·m-2·d-1(es-tuary)and 0.98 μmol·m-2·d-1(cecal segment).Therefore,the sediments may be an important source of dissolved inorganic phosphorus in the bottom water.The overall diffusion flux of dissolved inorganic phosphorus in the Meishan bay sediments was smaller than that of other sea areas and estuar-ies.Thus,our data suggests that the P pollution of the Meishan bay sediment was relatively lighter than its counterparts.
Keywords：sedimentpore wateroverlaying waterfluxMeishan bay
Publication Date：2025-02-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：10( 163-172 )