Influences of hydrological regime on heavy metal and salt ion concentrations in intertidal

Influences of hydrological regime on heavy metal and salt ion concentrations in intertidal sediment from Chongming Dongtan, Changjiang River

estuary, China

ZHAO Jiale;GAO Xiaojiang;YANG Jin

【期刊名称】《中国海洋湖沼学报（英文版）》 【年(卷),期】2017(035)006

【摘要】The tidal flat along the Changjiang (Yangtze) River estuary has long been reclaimed for the agricultural purposes,with the prevailing hydrological conditions during such pedogenic transformations being of great importance to their successful development.In this study,samples of surface sediment from Chongming Dongtan,situated at the mouth of the Changjiang River estuary,were collected and analyzed in order to understand how hydrological management can influence the concentrations of heavy metals and salt ions in pore water,and chemical fractionation of heavy metals during the reclamation process.We performed a series of experiments that simulated three different hydrological regimes:permanent flooding (R1),alternative five-day periods of wetting and drying (R2),continuous field capacity (R3).Our results exhibited good Pearson correlations coefficients between heavy metals and salt ions in the pore water for both R1 and R2.In particular,the concentrations of salt ions in the pore water