渤海表层沉积物中的生物硅

发布时间：2018-03-20 04:35

本文选题：生物硅　切入点：分步提取　出处：《海洋科学》2017年05期 　论文类型：期刊论文

【摘要】：采用0.1 mol/L HCl和1%Na2CO3两步连续提取法,对103个渤海表层沉积物样品的生物硅含量进行了分析,结果表明,渤海表层沉积物中生物硅含量范围为7.3~54.7 g/kg,均值31.5 g/kg,高于其他相关调查,原因可能是由于采用0.1 mol/L HCl提取过程中,破坏了生物硅表面的金属氧化膜。对沉积物生物硅含量的空间分布表征显示,莱州湾是沉积物生物硅的低值区、而渤海湾与辽东湾之间的河北沿岸海域是相对高值区,初步认为是陆源营养物质的输入与黄河泥沙长期不断输入干扰沉积环境的稳定性,造成了该海域表层沉积物生物硅分布差异。主成分分析显示,生物硅含量与沉积物黏粒含量、细粉砂、有机氮、有机碳的含量均呈极显著正相关(P0.01),进一步证实沉积物粒度特征和营养环境对生物硅积累的影响。
[Abstract]:The biological silicon content of 103 samples from surface sediments of Bohai Sea was analyzed by two-step extraction method of 0.1 mol/L HCl and 1 Na2CO _ 3. The results showed that the range of biological silicon content in surface sediments of Bohai Sea was 7.3 ~ 54.7 g / kg, with a mean value of 31.5 g / kg, which was higher than that of other related investigations. This may be due to the destruction of the metal oxide film on the surface of biological silicon during the extraction of 0.1 mol/L HCl. The spatial distribution of biogenic silicon content in sediments shows that the Laizhou Bay is the low value area of biogenic silicon in sediments. The coastal waters of Hebei Province between Bohai Bay and Liaodong Bay are relatively high value areas. It is preliminarily considered that the input of terrestrial nutrients and the continuous sediment input of the Yellow River interfere with the stability of the sedimentary environment for a long time. Principal component analysis (PCA) showed that the content of biological silicon and sediment clay content, fine silt, organic nitrogen, The content of organic carbon was significantly positively correlated with P0.01, which further confirmed the effects of sediment granularity and nutrient environment on the accumulation of biological silicon.
【作者单位】：中国科学院海岸带环境过程与生态修复重点实验室;中国科学院大学;
【基金】：中国科学院重点部署项目(KZZD-EW-14);中国科学院战略先导专项(XDA11020402)~~
【分类号】：P736.41

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