农业环境科学学报2016，Vol.35Issue(4)：745-749,5.DOI:10.11654/jaes.2016.04.019
沉积物中硅释放的影响因素研究
Factors influencing silicon releases from lake sediments
摘要
Abstract
Diatoms greatly control the water′s capacity to store CO2. Silicon(Si)level in water impacts diatom growth. In this work, the influ-ences 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 in-creases(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 hy-drophytes. 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.关键词
硅/释放/影响因素/沉积物/湖泊Key words
silicon/release/factors/sediment/lake分类
资源环境引用本文复制引用
郑琦,李磊,吕昌伟,王伟颖,何江,左乐,颜道浩..沉积物中硅释放的影响因素研究[J].农业环境科学学报,2016,35(4):745-749,5.基金项目
国家自然科学基金项目（41003049）；内蒙古自治区自然科学基金项目 （）
