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Increase in silicon concentrations and release from suspended solids and bottom sediments in Lake Kasumigaura, Japan

机译：日本霞浦湖中硅浓度的增加以及从悬浮固体和底部沉积物中的释放

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摘要

Increasing trends of dissolved Si measured by a colorimetric method and ICP (DSicol and DSiICP, respectively) and total Si concentrations were detected at the center of Lake Kasumigaura during 1980–2006 (mean DSicol concentration in the 1980s and 2000s was 1.3 and 4.0 mg l−1, respectively). The observation of such trends is rare; therefore, the elucidation of the causes could be useful to understanding silicon dynamics in inland waters. Based on statistical analysis, we found that the increases in DSicol and lithogenic Si accounted for most of the total Si increase (44 and 45%, respectively) and that biogenic Si, consisting of diatom frustules, also increased with them. Increases in DSiICP concentration were not detected near the mouth of the inflowing rivers, suggesting that the increase was caused by in-lake processes. Because the increase in suspended solids (SS) caused by sediment resuspension had been observed in the lake for the same period, we assumed that the Si release from SS containing diatom frustules contributed to the increase. The results of the laboratory experiments in which surface sediments were stirred in lake waters showed that the change in DSicol concentration depended mainly on SS concentration, water temperature and the elapsed time of diatom frustules dissolution. An estimation of the released amount of Si from SS using the sediment resuspension model was (1.0–2.7) × 109 g year−1 in the 2000s, which was about 30–90% of the increase in the DSicol outflow of 3.0 × 109 g year−1 from the 1980s to the 2000s. We also determined the Si release rates from bottom sediments through laboratory experiments. The Si amount released from bottom sediments in the lake in the 2000s was estimated to be 4.3 × 109 g year−1, which was about 2–4 times higher than the estimated Si amount released from SS. These findings suggest that the sediment resuspension might be the cause of the latest DSi increase.
机译：通过比色法和ICP（分别为DSicol 和DSiICP ）测量的溶解硅含量的增加趋势和总硅浓度在1980–2006年的霞浦湖中心被检测到（平均DSicol 1980年代和2000年代的浓度分别为1.3和4.0 mg l-1 。对这种趋势的观察很少。因此，阐明原因可能有助于理解内陆水域的硅动力学。根据统计分析，我们发现DSicol 和成岩硅的增加占总硅增加的大部分（分别为44和45％），并且由硅藻壳构成的生物硅也随之增加。在入流河口附近未检测到DSiICP 浓度增加，表明该增加是由于湖内过程引起的。由于在同一时期内，由于沉积物重悬引起的悬浮固体（SS）的增加，我们假设含SS的硅藻壳中的Si释放导致了该增加。在湖水中搅拌表面沉积物的实验室实验结果表明，DSicol 浓度的变化主要取决于SS浓度，水温和硅藻壳溶解的时间。使用沉积物再悬浮模型估算的SS中SS释放的Si量为（1.0–2.7）×109 g year-1 ，大约是SS释放量增长的30–90％。从1980年代到2000年代，DSicol 的流出量为3.0×109 g year-1 。我们还通过实验室实验确定了底部沉积物中硅的释放速率。 2000年代从湖底沉积物中释放的硅量估计为4.3×109 g year-1 ，约为从SS释放的估计Si量的2-4倍。这些发现表明，沉积物的重新悬浮可能是最近DSi增加的原因。

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  • 来源
    《Limnology》 |2012年第1期|p.81-95|共15页
  • 作者

    Hiroyuki Arai; Takehiko Fukushima; Kazuhiro Komatsu;

  • 作者单位

    Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan;

    Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan;

    National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Silicon; Suspended solids; Sediment; Dissolution; Lake Kasumigaura;

    机译：硅;悬浮固体;沉积物;溶出度;霞浦湖;

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