Chemical composition and characteristics (mean ± SEM) of the water layer, sediment pore water and sediment moisture and organic matter content.

* For results of statistical analyses on the decline of NH4+ concentrations in the pore water during the experiment, see Table 1. Please note the different units.Chemical composition and characteristics (mean ± SEM) of the water layer, sediment pore water and sediment moisture and organic matter content.关于实验期间孔隙水（pore water）中铵根离子（NH4+）浓度衰减的统计分析结果，请参见表1。请注意各指标的单位存在差异。本数据集涵盖水层、沉积物孔隙水的化学成分与特征（平均值±标准误（SEM）），以及沉积物的含水率与有机质含量。