Characterizing oxygen isotope variability and host water relation of modern and subfossil aquatic mosses
Characterizing oxygen isotope variability and host water relation of modern and subfossil aquatic mosses
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表征现代和亚化石水生苔藓的氧同位素变异性和宿主水关系
DOI：
10.1016/j.gca.2014.01.013
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发表时间：
2014
影响因子：
5
通讯作者：
the PASADO science team
中科院分区：
文献类型：
--
作者：
Lücke;Wissel;Ohlendorf;Zolitschka;the PASADO science team
巴塔哥尼亚南部的一项实地调查表明，现代沉水水生苔藓和其各自的宿主沃茨中提取的纤维素的δ 18 O值之间存在高度显著的线性相关性。然而，保存在湖泊沉积物中的水生苔藓的数量往往不足以用于氧同位素分析的纤维素提取。比较而言，水生藓类有机质δ18O分析所需的样品少得多，但由于无机物的污染，需要进一步的预处理。本研究将纤维素δ 18 O方法推广到水生藓类有机质和水生维管植物，以探讨水生植物δ 18 O值与宿主沃茨的关系。此外，我们专注于纤维素和预处理的亚化石水生苔藓和维管植物的有机质之间的比较，就其δ 18 O和δ 13 C值从拉古纳Potrok艾克，南部巴塔哥尼亚玛珥湖。两个代表性的淹没水生苔藓物种和不同的苔藓部分（树枝和树叶）的亚化石遗骸手工挑选和调查苔藓有机质，苔藓纤维素和纤维素粗植物碎片内的苔藓丰富的沉积物部分进行配对。结果表明，与藓类纤维素类似，藓类有机质的δ 18 O值与其各自的宿主沃茨之间存在显著的线性相关性。因此，过去的湖水δ 18 O值可以从苔藓纤维素以及纯化的苔藓有机质中以相当的精度推断出来。只有少量的18O富集（ca.水生维管束植物纤维素的δ 18 O值比水生藓类的δ 13 C值高约1‰，而水生维管束植物纤维素的δ 13 C值比水生藓类的δ 18 O值高约1‰。20‰）。不同种类藓类有机质δ18O值的显著差异表明，基于藓类有机质的湖水δ18O值重建可能是一种单种分析。然而，不同的沉水苔藓部分（树枝和叶子）的分离是没有必要的，因为它们的δ 18 O值难以区分。配对调查表明，湖水δ 18 O值的一致变化推断苔藓有机质，苔藓纤维素，并在限制范围内，粗植物残体纤维素。这提供了一个潜在的组合结果从不同的苔藓有机组分（纤维素，纯化OM）到一个复合湖水δ 18 O记录，以实现高分辨率的古环境重建。尽管有几个悬而未决的问题，这种方法可以成功地应用于世界各地的其他湖泊，水生苔藓仍然保存。
A field survey in southern Patagonia has shown a highly significant linear correlation between δ18O values of cellulose extracted from modern submerged aquatic mosses and their respective host waters. The amount of aquatic moss remains preserved in lake sediments is, however, often not sufficient for cellulose extraction for oxygen isotope analysis. By comparison, the δ18O analysis of bulk organic matter of aquatic mosses requires much less material, but further pretreatment due to inorganic contamination is needed. In this study we extend the cellulose δ18O approach to aquatic moss organic matter and aquatic vascular plants in order to explore the relation between δ18O values of aquatic plants and host waters. Furthermore, we focus on a comparison between cellulose and pretreated organic matter of subfossil aquatic mosses and vascular plants with regard to their δ18O and δ13C values from Laguna Potrok Aike, a southern Patagonian maar lake. Subfossil remains of two representative submerged aquatic moss species and different moss parts (branches and leaves) are handpicked and an investigation on moss organic matter, moss cellulose and cellulose from coarse plant debris is performed in pairs within a moss-rich sediment section. Our results show that, similar to moss cellulose, a significant linear correlation exists between δ18O values of purified moss organic matter and their respective host waters. Past lake water δ18O values can thus be inferred from moss cellulose as well as from purified moss organic matter with comparable precision. Only a marginal18O enrichment (ca. 1‰) is observed for δ18O values of cellulose from aquatic vascular plants compared to that of aquatic mosses, whereas δ13C values of aquatic vascular plant cellulose show a pronounced13C enrichment (ca. 20‰) relative to aquatic mosses. Noticeable differences in δ18O values of organic matter from different moss species suggest a monospecific analysis for the reconstruction of lake water δ18O values based on moss organic matter. Separation of different submerged aquatic moss parts (branches and leaves) is, however, not necessary due to their indistinguishable δ18O values. The paired investigation demonstrates a consistent variation of lake water δ18O values inferred from moss organic matter, moss cellulose and, within limitations, cellulose from coarse plant debris. This offers the potential for combining results from different moss organic fractions (cellulose, purified OM) into a composite lake water δ18O record to achieve high-resolution paleoenvironmental reconstructions. Despite several open issues, the approach could be successfully applied to other lakes worldwide where aquatic moss remains are preserved.
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影响因子：
2.7
作者：
C. Osmond;N. Valaane;S. Haslam;P. Uotila;Z. Roksandic
通讯作者：
C. Osmond;N. Valaane;S. Haslam;P. Uotila;Z. Roksandic
巴利艾克火山场的火山口湖是阿根廷巴塔哥尼亚南部古气候和古生态重建的关键地点
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
B. Zolitschka;F. Schäbitz;A. Lücke;H. Corbella;B. Ercolano;M. Fey;T. Haberzettl;Stephanie Janssen;N. Maidana;C. Mayr;C. Ohlendorf;G. Oliva;M. Paez;G. Schleser;J. Soto;P. Tiberi;M. Wille
通讯作者：
M. Wille
影响因子：
64.8
作者：
MACDONALD, GM;EDWARDS, TWD;SMOL, JP
通讯作者：
SMOL, JP
影响因子：
3.8
作者：
ERICKSON, M;MIKSCHE, GE
通讯作者：
MIKSCHE, GE
南极洲东部阿默里绿洲拉多克湖深水出现的苔藓 Bryum primetriquetrum
影响因子：
1.7
作者：
B. Wagner;R. Seppelt
通讯作者：
R. Seppelt