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| Factors influencing silicon releases fromlake sediments |
| Received:November 15, 2015 |
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| KeyWord:silicon;release;factors;sediment;lake |
| Author Name | Affiliation | E-mail | | ZHENG Qi | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | LI Lei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | LÜ Chang-wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | lcw2008@imu.edu.cn | | WANG Wei-ying | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | HE Jiang | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | ZUO Le | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | YAN Dao-hao | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | |
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| Abstract: |
| Diatoms greatly control the water's capacity to store CO2. Silicon(Si) level in water impacts diatom growth. In this work, the influences of pH, microorganism and low molecular weight organic acids on silicon releases from the sediments of Wuliangsuhe(WLSH) Lake were investigated under simulating experiments. Results showed that concentrations of Si in overlying water decreased along with pH increases(7.0~9.5), while the content of BSi in sediments increased. This indicated that the diffusion direction of Si released was towards the sediments at the water-sediment interface under weak-alkaline environment. Silicon concentrations were higher in microorganism system than in non-microorganism system in both overlying water and sediments. The differences in Si concentrations in both overlying water and sediments among different hydrophyte areas were resulted from the differences of low molecular weight organic acids excreted by hydrophytes. Sediments from both submerged and emergented plant areas acted as Si sink and source, depositing and releasing 15.62 t and 33.15 t Si in the whole year, respectively. This work would advance the understanding of the transformation, migration and biogeochemical cycle of Si in lake sediments as well as protection of terrestrial aquatic environment. |
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