Distribution, fluxes and budget of silicon in the Yellow Sea
LIU Jun1,2, ZANG Jia-ye2, ZHANG Li-jun2,3, SUN Tao2, YU Zhi-gang1, RAN Xiang-bin2
1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. Research Center for Marine Ecology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;
3. College of Chemical Science and Engineering, Qingdao University, Qingdao 266071, China
Based on the comprehensive investigation in the Yellow Sea in 2012, Si concentrations and distributions in the water column and sediment were analyzed; and a budget model of Si in the Yellow Sea was established. The results show that both dissolved silica (DSi) and biogenic silica (BSi) in the water column are higher in Fall than in Spring. BSi accounts for 22% of total reactive Si. DSi and BSi in the water column are largely affected by terrestrial inputs, phytoplankton production and diffusion at the water-sediment interface. Si budget indicates that the major process contributed to the primary production in the water column is the benthic flux, accounting for 48% of total input loading, followed by water exchange from the East China Sea, representing for 32%. Riverine input, groundwater discharge, surface runoff (excluding riverine input) and Bohai Sea input contribute 9%, 6%, 3%, and 1.5% of total Si input, respectively, while the atmospheric deposition holds only 0.5%. The dominant removal of DSi from water column in the Yellow Sea is diatom uptake then sedimentation and export to the East China Sea, accounting for 72% and 27%, respectively, while output to Bohai Sea contributes only 1.0%. Net burial of BSi is about 55×109mol/a, representing 7.2% of primary production and accounting for 47% of exogenetic Si inputs into the Yellow Sea. This study quantifies the main processes of Si cycling, and reveals the source-sink characteristics and the influence of terrestrial loadings on the Si budget in the Yellow Sea.
刘军, 臧家业, 张丽君, 孙涛, 于志刚, 冉祥滨. 黄海硅的分布与收支研究[J]. 中国环境科学, 2016, 36(1): 157-166.
LIU Jun, ZANG Jia-ye, ZHANG Li-jun, SUN Tao, YU Zhi-gang, RAN Xiang-bin. Distribution, fluxes and budget of silicon in the Yellow Sea. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(1): 157-166.
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