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采用实验室培养法在原位温度和溶氧条件下测定了胶州湾沉积物-海水界面硅的交换速率,并探讨了相关环境因子对界面交换速率的影响机制。结果表明,胶州湾沉积物-海水界面硅的交换表现为从沉积物向水体释放,其交换速率在947~4 889μmol/(m~2·d)范围内,平均速率为1 819μmol/(m~2·d)。表层沉积物中叶绿素a(Chla)和总有机碳(TOC)是影响胶州湾沉积物-海水界面硅交换速率的主要环境因子,同时表层沉积物的含水率(φ)、生源硅(BSi)和粘土含量以及间隙水中溶解硅酸盐(DSi)对沉积物-海水界面硅的交换也有重要影响。由此可推知,胶州湾沉积物-海水界面硅的交换速率主要受生物活动和溶解-扩散双重过程调控,而表层沉积物粒度与底层水体中DSi对胶州湾硅的释放影响较小。
The exchange rate of silicon in the sediment-seawater interface at Jiaozhou Bay was determined by laboratory culture method under in-situ temperature and dissolved oxygen conditions, and the influence mechanism of relevant environmental factors on the interfacial exchange rate was discussed. The results showed that the exchange performance of silicon at the sediment-seawater interface of Jiaozhou Bay was released from sediments to the water body with an exchange rate of 947-4889μmol / (m ~ 2 · d) and an average rate of 1 819μmol / (m ~ 2 · d). Chla and TOC in the surface sediments are the main environmental factors that affect the silicon exchange rate at the sediment-sea interface at the Jiaozhou Bay. At the same time, the water content (φ), biogenic silicon (BSi) and Clay content and dissolved silicate (DSi) in interstitial water also have an important effect on the exchange of silicon at the sediment-sea interface. It can be inferred that the exchange rate of silicon in the sediment-seawater interface at Jiaozhou Bay is mainly controlled by biological activity and dissolution-diffusion process, while the surface sediment particle size has little effect on the release of silicon in the Jiaozhou Bay.