人类活动对象山湾滩涂沉积物理化特征的累积效应

Cumulative Effects of Human Activities on the Physiochemical Properties of the Tidal Flat Sediments in Xiangshan Bay

[目的]研究人类活动对象山湾滩涂沉积物理化特征的累积效应。[方法]选取象山湾沿岸滩涂沉积物作为供试材料,测定沉积物样品粒度特征、磁化率、总有机碳及硝态氮含量。[结果]象山湾滩涂沉积物粒径组成以粉粒为主,质地较为黏重,可塑性和保水性较好,透气性差,且沉积物粒径组成随深度变化明显;磁性物质的含量随着取样深度的增加而不断减少;有机物质含量较高,且随着取样深度的增加,有机质含量明显下降,但总体维持在较高水平;硝态氮含量随取样深度的增加总体呈上升趋势,波动明显。[结论]人类活动对象山湾滩涂影响较为明显,理化特征的累积效应在剖面上表现显著。

[Objective] To research the cumulative effects of human activities on the physiochemical properties of the tidal flat sediments in Xiangshan Bay. [Method] With tidal flat sediments in Xiangshan Bay as the test materials,the granularity,magnetic susceptibility,total organic carbon and nitrate nitrogen of sediment samples were detected. [Result] The main particle size of tidal flat sediments in Xiangshan Bay was powder particle,which had good plasticity and water-retaining property but poor breathability. Particle size of sediments changed significantly as the depth changed. As the sample depth enhanced,content of magnetic materials gradually reduced,organic matter content declined significantly with in all at a relatively high level,and nitrate nitrogen showed upward trend in general with significant fluctuation. [Conclusion] Tidal flat in Xiangshan Bay is obviously influenced by human activities and the cumulative effects on the physiochemical properties shows clearly in profile.