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淡水沉積物中被針鐵礦包裹的鐵素體的有限還原——結論、致謝！

來源：上海謂載發布時間:2021-11-02 17:08:48 瀏覽：985 次

結論

我們檢查了 Fe(III) 羥基氧化物表面上次生 Fe 礦物的表面結殼的存在，這可能會限制微生物 Fe (III) 還原的程度。淡水沉積物的特征是水鐵礦占主導地位的表層含有生物莖和鞘。 1 和 2 厘米深度的 16S rRNA 基因分析結果檢測到 Fe(II) 氧化細菌 Gallionellaceae。在 2-4 厘米的沉積物深度處，孔隙水 Fe2+ 濃度顯著增加。在 1、2 和 4 厘米的沉積物深度檢測到異化 Fe(III) 還原菌。根據 EXAFS 結果，建議菱鐵礦和針鐵礦在 3 cm 以下的深度沉淀。然而，僅在 3 至 4 cm 深度之間觀察到 Fe 礦物組成的變化，并且大部分水鐵礦保持在 4 cm 以下的深度。 6 cm 以下深度濃度增加。孔隙水中生物質的穩定同位素分析表明，7 cm以下深度存在乙酰碎屑生物質，這種生物質的產生通常受到異化Fe(III)還原的抑制。 16S rRNA 基因分析的結果表明，在 10 厘米深度處存在產甲烷古菌 Methanosarcinales。這些結果表明，在 4 cm 以下深度水鐵礦的不完全還原不是由于缺乏有機碳。 TEM 觀察表明，莖和鞘表面的 Fe 礦物從 1 cm 深度的水鐵礦轉變為 3 cm 以下深度的菱鐵礦和針鐵礦。此外，通過 CEYEXAFS 分析在 10 厘米深度處定量鐵礦物形態表明針鐵礦主要存在于顆粒表面。這些結果不同于大量 EXAFS 分析結果，即水鐵礦是主要的鐵礦物種類。根據這些結果，水鐵礦表面可能被針鐵礦包裹，這可能限制了水鐵礦在 4 cm 深度以下的還原程度。

致謝

我們感謝 M. Miyazaki 博士和 K. Yanagawa 博士在構建系統發育樹方面提出的善意建議。本研究由 JSPS 青年科學家研究獎學金資助。這項工作也得到了 SPring-8 (2012A1589, 2013A1613, 2014A1416) 和 KEK (2013G052, 2013G562) 的支持。

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