| 颜道浩,吕昌伟,何江,王伟颖,左乐,李磊.湖泊水-沉积物界面SiO3-Si交换通量研究[J].农业环境科学学报,2015,34(12):2349-2356. |
| 湖泊水-沉积物界面SiO3-Si交换通量研究 |
| Exchange Fluxes of SiO3-Si Across Water-Sediment Interface in Different Lakes |
| 投稿时间：2015-06-21 |
| DOI：10.11654/jaes.2015.12.014 |
| 中文关键词: 硅 扩散通量 释放速率 水-沉积物界面 湖泊 |
| 英文关键词: SiO3-Si diffusion flux release rate sediment-water interface lake |
| 基金项目:国家自然科学基金项目(41003049,40863003);内蒙古自然科学基金项目(2015MS0404,2009BS0601) |
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| 中文摘要: |
| 以乌梁素海(WLSH)和岱海(DH)为研究对象,采用柱状芯样模拟法,开展了湖泊水-沉积物界面溶解性硅酸盐(SiO3-Si)扩散通量研究。结果表明,在夏季90 d的时间内,浅水草型湖泊乌梁素海明水区沉积物-水界面交换速率约为1.28 mmol·m-2·d-1,沉积物约向上覆水体释放了963.07 t SiO3-Si;而深水藻型湖泊岱海深、浅湖区沉积物-水界面交换速率分别为1.10、1.95 mmol·m-2·d-1,沉积物约向上覆水体释放了893.41 t SiO3-Si.SiO3-Si在水-沉积物界面的交换速率与两湖沉积物中粘土矿物含量、生物硅(BSi)含量及沉积物的粒度有较好的相关性。沉积物释放的SiO3-Si对维持湖泊初级生产力有重要作用,乌梁素海沉积物释放的硅可提供浮游植物所需硅的11.96%,岱海沉积物释放的硅可提供浮游植物所需硅的41.3%.从元素化学计量学角度考虑,结合两个湖泊上覆水营养盐浓度变化,随湖泊富营养化水平的逐渐提高,磷有可能成为乌梁素海初级生产力的潜在限制因子,而Si是岱海初级生产力可能的限制因子。 |
| 英文摘要: |
| 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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