Potential application of biogenic silica as an indicator of paleo-primary productivity in East Antarctic lakes
Potential application of biogenic silica as an indicator of paleo-primary productivity in East Antarctic lakes
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生物硅作为东南极湖泊古原始生产力指标的潜在应用
DOI：
10.3724/sp.j.1085.2011.00131
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发表时间：
2011-01
影响因子：
--
通讯作者：
Xiaodong Liu
中科院分区：
文献类型：
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作者：
Shan Jiang;Liqiang Xu;Liguang Sun;Xiaodong Liu
我们采集了东南极地区的两个湖泊沉积物岩心（MC和DM），用于分析生物硅和其他地球化学参数（例如，有机质（C、N、S、H）。在综合对比研究的基础上，重点探讨了生物硅在东南极湖泊古初级生产力重建中的应用潜力。分析结果表明，淡水湖泊沉积物中保存了大量硅藻，生物硅含量在不同水深范围内有明显的波动。生物硅含量随水深变化具有一致性，且随有机质含量的变化而变化，显示了其作为生态环境指标的潜力。低水平的BSi和有机质表明减少湖泊藻类生产，并对应于减少湖泊初级生产力。由于东南极湖泊生态系统脆弱，陆地有机质贡献有限，湖泊沉积物中生物硅含量可以敏感地指示古初级生产力的演化历史。总体而言，BSi是重建东南极湖相沉积物中记录的过去生态环境变化的理想代用指标。
We collected two lake sediment cores (MC and DM) from the East Antarctic region for analysis of biogenic silica and other biogeochemical parameters (e.g., organic matter, C, N, S, H). Based on synthetically comparative research, we focused on the potential application of biogenic silica (BSi) for the reconstruction of paleo-primary productivity in the East Antarctic lakes. Analytical results showed that a large number of diatoms were well preserved in the freshwater lake sediments, and that concentrations of biogenic silica displayed notable flctuations over diffrent water depths. The content of biogenic silica had a consistent profie over water depth, and this pattern changed with organic matter, reflcting their potential as eco-environmental proxies. Low levels of BSi and organic matter indicated reduction of lake algal production, and corresponded to decreased lake primary productivity. Due to the fragile ecosystem state and limited contribution of terrestrial organic matter in the East Antarctic lakes, the contents of biogenic silica in the lacustrine sediments can sensitively indicate the evolutionary history of paleo-primary productivity. Overall, BSi is an ideal proxy for the reconstruction of past eco-environmental change recorded in the lacustrine sediments on East Antarctica.