评估沉积学、地球化学和生物代用指标对重建洪泛区古水文的适用性

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL Quaternary International Pub Date : 2024-04-04 DOI:10.1016/j.quaint.2024.03.005
Renske Hoevers , Nils Broothaerts , Ellen Jennen , Ward Swinnen , Gert Verstraeten
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引用次数: 0

摘要

要对河流和洪泛区进行可持续管理,就必须从根本上了解其长期的 "地质水文 "动态。要研究这些动态,必须采用多代理方法。虽然有合适的代用指标可以重建洪泛区地貌和过去的植被,但现有的过去水文代用指标是否适合重建洪泛区的湿度还没有进行过评估。在本研究中,我们结合睾丸变形虫和几种分解地球化学代用指标(腐殖化、碳和氮稳定同位素),并与沉积学(地层学、点火损失)和古植物学记录进行对比,采用多代用指标分析,获得了不同环境背景下冲积洪积平原的独立水文重建结果,从而探索可用的过去水文代用指标是否适合重建洪积平原的湿度。这项研究的结论是,睾丸变形虫不能提供连续可靠的水文重建,因为它们在冲积泥炭沉积物中保存不足。此外,测试粒度范围内的矿物颗粒也阻碍了以矿物为主的沉积物单元的分析。由于地下水位高时有机物分解率低,反之亦然,我们希望分解代用指标能反映水文条件。虽然腐殖酸的数量似乎主要取决于基质而非其中有机物的分解情况,但碳和氮稳定同位素分析为泥炭和非泥炭沉积物提供了有希望的结果。
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Evaluating the suitability of sedimentological, geochemical, and biological proxies for reconstructing floodplain palaeohydrology

Fundamental insight into the long-term ‘geoecohydrological’ dynamics of rivers and floodplains is required for their sustainable management. To study these dynamics, a multi-proxy approach is essential. While suitable proxies are available for reconstructing floodplain geomorphology and past vegetation, the suitability of the available proxies for past hydrology to reconstruct floodplain wetness has not yet been evaluated. In this study, we apply a multi-proxy analysis combining testate amoebae and several geochemical proxies for decomposition (humification, carbon and nitrogen stable isotopes), in comparison to sedimentological (stratigraphy, loss on ignition) and palaeobotanical records, to obtain independent hydrological reconstructions of alluvial floodplains in contrasting environmental settings to explore the suitability of the available proxies for past hydrology to reconstruct floodplain wetness.

This study concludes that testate amoebae cannot provide a continuous and reliable hydrological reconstruction, as they are insufficiently preserved in alluvial peat deposits. In addition, mineral particles within the tests size range hamper the analysis in mineral-dominated sediment units. As organic matter decomposition is low when water tables are high and vice versa, we expected the decomposition proxies to reflect the hydrological conditions. While the amount of humic acids appears to depend mainly on the substrate rather than the decomposition of the organic matter in it, the analyses of carbon and nitrogen stable isotopes provide promising results, for both peat and non-peat deposits.

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来源期刊
Quaternary International
Quaternary International 地学-地球科学综合
CiteScore
5.60
自引率
4.50%
发文量
336
审稿时长
3 months
期刊介绍: Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.
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Editorial Board Editorial Board Editorial Board Upper Pleistocene in Mallorca: Sedimentary variability of littoral units in relation to different structural contexts Early Pleistocene forerunners of Mammuthus-Coelodonta Faunal Complex in Nihewan Basin, North China
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