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首页> 外文期刊>Journal of Paleolimnology >Lignin degradation products as palaeoenvironmental proxies in the sediments of small lakes
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Lignin degradation products as palaeoenvironmental proxies in the sediments of small lakes

机译：木质素降解产物作为小湖沉积物中的古环境代理

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摘要

The quantity and quality of lignin phenols (Σ8, Λ, S/V, C/V and (Ad/Al)v) in the sediments of three small Lobelia lakes with neither inlets nor outlets were investigated and compared with palynological data and lithology of the profiles. The method of alkaline CuO oxidation was used. Substantial differences with respect to sedimentary lignin concentration and provenance recorded along the profiles and among the sites are in good agreement with pollen data describing the dominant type of vegetation and with indices of soil erosion in the lakes’ catchments. This relation shows that the compositions of lignin degradation products in these lakes are closely related to the local environmental conditions. In all the lakes gymnosperm wood is the main source of lignin products; however, each lake is characterized by different S/V index values. Especially good correlations were obtained between pine pollen proportions in sediments and the S/V index. The correlation between the C/V and (Ad/Al)v indices indicates a higher degradation of organic matter when non-woody tissue is more abundant. This pilot study illustrates the usefulness and potential for a wider application of lignin oxidation products in palaeoecological reconstructions. This kind of data would be of special importance when investigating local presence/absence of woody plants and the role of angiosperms/gymnosperms in local vegetation. Estimates of lignin biodegradation levels, as well as the data on diagenetic processes, may afford supplementary information on possible disturbances in sedimentation.
机译：研究了三个既没有进出口也没有出口的山梗菜湖沉积物中木质素酚（Σ8，Λ，S / V，C / V和（Ad / Al）v ）的数量和质量，并将其与孢粉学进行了比较。剖面的数据和岩性。使用碱性CuO氧化的方法。沿剖面和各地点之间记录的沉积木质素浓度和出处的显着差异与描述植被主要类型的花粉数据以及湖泊流域的土壤侵蚀指数高度吻合。这种关系表明，这些湖泊中木质素降解产物的组成与当地环境条件密切相关。在所有湖泊中，裸子植物的木材是木质素产品的主要来源。但是，每个湖泊都具有不同的S / V指数值。沉积物中松花粉比例与S / V指数之间尤其具有良好的相关性。 C / V和（Ad / Al）v 指数之间的相关性表明，当非木质组织更丰富时，有机物的降解程度更高。这项初步研究说明了木质素氧化产物在古生态重建中的广泛应用的实用性和潜力。当调查当地木本植物的存在与否以及被子植物/裸子植物在当地植被中的作用时，此类数据将特别重要。木质素生物降解水平的估计值以及成岩过程的数据可能会提供有关沉积物中可能干扰的补充信息。

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