In estuarine wetland ecosystems, the heavy metal content and especially the metal fractionation are influenced by water and salinity conditions. We collected sediments from the intertidal zone of the Yellow River Delta, where the water and salinity conditions changed frequently. The incubation experiments at different water and salinity levels were carried out in the laboratory to investigate the migration of Cr, Cu, Zn, Cd and Pb in the intertidal sediments. The results showed that the proportions of the residual fractions of Cr, Cu, Zn and Pb in the intertidal sediments were high, and the exchangeable Cd fraction was the highest. The Cr and Pb fractionations were significantly associated with the water level conditions. Different water level conditions were significantly related to the contents of the oxidizable fractions of Cr, Zn, and Cd. Except for the oxidizable Cu fraction, all Cu fractions were significantly correlated with the water conditions. Increasing salinity enhanced the migration risk of Cd and Pb. High salinity reduced the migration risk of Cr, Cd and Cu. The results of this study demonstrated that tidal floods increased the migration risk of Cd and Pb, and high salinity reduced the migration of Cr, Cd and Cu.

在河口湿地生态系统中，重金属含量（尤其是金属分馏）受水和盐度条件的影响。我们收集了黄河三角洲潮间带的沉积物，那里的水和盐分条件经常变化。在实验室中进行了不同水和盐度水平的温育实验，以研究潮间带沉积物中Cr，Cu，Zn，Cd和Pb的迁移。结果表明，潮间带沉积物中Cr，Cu，Zn和Pb的残留分数所占比例较高，可交换的Cd分数最高。Cr和Pb的分馏与水位条件显着相关。不同的水位条件与Cr，Zn和Cd的可氧化部分的含量显着相关。除了可氧化的铜组分外，所有铜组分均与水条件显着相关。盐度增加会增加Cd和Pb的迁移风险。高盐度降低了Cr，Cd和Cu的迁移风险。这项研究的结果表明，潮汐洪水增加了Cd和Pb的迁移风险，而高盐度降低了Cr，Cd和Cu的迁移。