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首页> 外文期刊>Aquatic Sciences >High concentrations of amorphous, biogenic Si (BSi) in the sediment of a small high-latitude lake: implications for biogeochemical Si cycling and for the use of BSi as a paleoproxy
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High concentrations of amorphous, biogenic Si (BSi) in the sediment of a small high-latitude lake: implications for biogeochemical Si cycling and for the use of BSi as a paleoproxy

机译：高纬度小湖沉积物中高浓度的非晶态生物硅（BSi）：对于生物地球化学硅循环以及将BSi用作古过氧化物的影响

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摘要

The concentration of biogenic silica (BSi) in soils and sediments may be studied for several purposes, most notably either as a paleo-environmental proxy or to clarify the transport of weathering-derived Si within the biogeosphere. With this in mind, we explored the reasons behind the very high BSi concentration (average 250 mg Si g~(-1) dry mass) in the sediment of a small, high-latitude lake in Finnish Lapland, Lake Kuutsjaervi, using bulk BSi and stable Si isotope analysis of major Si pools in the lake and its drainage area. The high BSi content of the sediment was relatively stable over the past few hundred years and recent changes in the food web of the lake were not clearly reflected in the data. The origin of the sedimentary BSi was not solely autochthonous diatom production: extraneous sources accounted for possibly as much as 54-88 % (isotope analysis). A main reason for the high BSi content appeared to be the transport of older deposits of diatom material from the drainage area into the current lake basin, although other factors such as good preservation conditions may have contributed. Although our results indicate that small high-latitude lakes may be hot-spots in the burial of BSi, more information is needed on the processes that affect the translocation of BSi from the drainage area to the aquatic system. Caution is advisable when past lake conditions are inferred from sedimentary BSi only.
机译：可以出于多种目的研究土壤和沉积物中生物二氧化硅（BSi）的浓度，最显着的是作为古环境的替代物或阐明风化硅在生物地球圈内的运输。考虑到这一点，我们探索了使用散装BSi在芬兰拉普兰湖Kuutsjaervi的一个小高纬度湖泊的沉积物中产生很高的BSi浓度（平均干物质250 mg Si g（（-1）干质量）的原因。湖泊及其流域主要硅池的稳定硅同位素分析。在过去的几百年中，沉积物中的高BSi含量相对稳定，数据中并未清楚反映湖泊食物网的最新变化。沉积的BSi的来源不只是硅藻土的自生：外来来源可能占54-88％（同位素分析）。高BSi含量的主要原因似乎是将较旧的硅藻物质沉积物从流域转移到目前的湖盆中，尽管其他因素（例如良好的保存条件）也可能起作用。虽然我们的结果表明，小高纬度湖泊可能是BSi埋葬的热点，但仍需要更多有关影响BSi从流域向水生系统迁移的过程的信息。仅从沉积的BSi推断过去的湖况时，应谨慎行事。

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  • 来源
    《Aquatic Sciences》 |2015年第2期|293-305|共13页
  • 作者

    Petra Tallberg; Sophie Opfergelt; Jean-Thomas Cornells; Anne Liljendahl; Jan Weckstroem;

  • 作者单位

    Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Finland;

    Earth and Life Institute, Universite catholique de Louvain, Croix du Sud 2 bte L7.05.10, 1348 Louvain-la-Neuve, Belgium;

    Earth and Life Institute, Universite catholique de Louvain, Croix du Sud 2 bte L7.05.10, 1348 Louvain-la-Neuve, Belgium;

    Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Finland;

    Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Finland;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Sediment; Biogenic silica; BSi; Phytolith; Lake; Stable isotopes;

    机译：沉淀;生物硅BSi;植石湖;稳定同位素;

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