烟台四十里湾表层沉积物中生物硅的研究

Biogenic silica in the surface sediment of Sishili Bay, Yantai

以烟台四十里湾作为研究区域,分析了16个站位表层沉积物中生物硅的含量,探讨沉积物中生物硅对内湾环境的指示作用。结果表明,污水排放区、垃圾倾倒区沉积物中生物硅含量较高(平均值分别为0.71%和0.78%),对应上层水体的富营养化;航道区生物硅含量很低(平均值0.37%),与航船扰动造成的低生产力状况符合。沉积物中生物硅含量较好地反映了上层水体的浮游植物状况,并与上层营养盐浓度具有很好的对应关系。研究表明,沉积环境能够明显影响沉积物中生物硅的沉积和保存。

Surface sediment samples were collected at 16 stations in Sishili Bay and biogenic silica （BSi） were investigated to discuss the environmental indication to the bay. Results showed that the high values of BSi in the sewage discharge area and the dumping area （average value： 0.71% and 0.78%, respectively） corresponding to eu- trophication conditions; BSi value was low along the shipment channel, which agreed with the low productivity as a result of shipping disturb. Good correlation was showed between BSi and phytoplankton and nutrient concentration of up water. The research showed hydrodynamic environment could affect the sedimentation of BSi in a certain degree and the pearson correlation showed that grain size characteristics played an important role of preservation of BSi.