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| Exchange Fluxes of SiO3-Si Across Water-Sediment Interface in Different Lakes |
| Received:June 21, 2015 |
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| KeyWord:SiO3-Si;diffusion flux;release rate;sediment-water interface;lake |
| Author Name | Affiliation | E-mail | | YAN Dao-hao | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China | | | LÜ Chang-wei | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China | lcw2008@imu.edu.cn | | HE Jiang | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China | | | WANG Wei-ying | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China | | | ZUO Le | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China | | | LI Lei | College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China | |
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| Abstract: |
| Silicon(Si) flux greatly influences Si concentrations and primary productivity of aquatic ecosystems. An investigation was conducted to examine the release characteristics and fluxes of SiO3-Si across the water-sediment interface in Lake Wuliangsuhai(WLSH) and Daihai(DH) by employing columnar simulation method. During the summer of 90 days, the exchange rate of SiO3-Si at the water-sediment interface was about 1.28 mmol·m-2·d-1, with 963.07 t of SiO3-Si released into lake water in WLSH, while it was about 1.10 mmol·m-2·d-1 and 1.95 mmol·m-2·d-1 in the deep and shoal water zones, respectively, with 893.41 t of SiO3-Si entered in Lake DH. This indicated that the sediments in WLSH and DH functioned as source of SiO3-Si in the summer. The exchange rate of SiO3-Si at sediments-water interface was correlated with clay and biogenic silica(BSi) content and particle size of the sediments. Silicon released from sediments played an important role in maintaining lake primary productivity, providing 15% and 49.5% of SiO3-Si required by phytoplankton in WLSH and DH, respectively. The stoichiometry results showed that phosphorus and SiO3-Si would be the limiting nutrients for the primary productivity of phytoplankton in WLSH and DH, respectively. |
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