渤海颗粒有机碳与生物硅的分布及来源

海洋碳、硅循环及其相关联的生物地球化学过程是全球环境变化的热点问题,也是海洋科学关心的重要领域。利用2012年5月和11月份对渤海海域的调查结果,对该海域颗粒有机碳和生物硅的分布特征及来源进行了讨论。主要结论为:渤海有机碳以溶解有机碳为主,具有春季高和秋季低的特征;由陆地来源和海洋自生的有机碳组成,且以海洋来源的有机碳为主。渤海生物硅分布具有明显的梯度特征,河流输入同样对其含量的影响较为突出。渤海沉积物中生物硅含量较高,明显高于中国东部陆架海。渤海表层沉积物中生物硅主要是海源的,依次由浮游藻类、植硅体和海绵骨针所构成,其中浮游藻类占62.9%,陆源植硅体占31.1%。渤海沉积物发现了来自于草本植物的植硅体,这说明了陆地产生的植硅体对海洋生物硅的贡献。

Distributions and sources of particle organic carbon and biogenic silica in the Bohai Sea

Carbon and silicon cycles are hot issue of global environmental change,and also an important area of marine science. Base on the investigation in the Bohai sea in May and November 2012,distributions and sources of particulate organic carbon (POC) and biogenic silica (BSi) were discussed. Conclusions are as follows: POC was higher in Spring than in Fall,and its component was consisted by the both the terrestrial and marine materials. BSi distribution showed gradient trend and was influenced by the Huanghe River as well,and a significant linear relationship was found between BSi and POC,which indicated their sources were same to some extent. BSi content in sediment was much higher in the Bohai Sea than other China Sea. Marine phytoplankton and terrestrial phytolith were the main components of BSi in the sediment,and phytoplankton supplied about 62.9% of total BSi. Terrestrial phytolith was found in the sediment,which is of great importance for marine silicon cycle as well.