西伯利亚远东两个热岩溶湖泊的地球化学、沉积学和微生物多样性

IF 3.9 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Ove H. Meisel, Ruud Rijkers, Joshua F. Dean, Michiel H. in ‘t Zandt, Jacobus van Huissteden, Trofim C. Maximov, Sergey V. Karsanaev, Luca Belelli Marchesini, Arne Goovaerts, Lukas Wacker, Gert-Jan Reichart, Steven Bouillon, Cornelia U. Welte, Mike S. M. Jetten, Jorien E. Vonk, Han Dolman
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引用次数: 0

摘要

热岩溶湖是北极地区有机碳固存、土壤有机质(土壤OM)分解和大气温室气体释放的重要通道。它们可以被分类为浮冰湖,全年在湖床上维持一个未冻结沉积物区(talik),也可以被归类为河床冰湖,在冬天一直冻结到湖床。热岩溶湖泊的另一个关键特征是其侵蚀海岸线,根据周围的景观,它们可以在为湖床提供沉积物和OM方面发挥重要作用。冬季冰情和侵蚀海岸线的差异是决定热岩溶湖泊沉积物中OM数量和质量的关键因素。我们使用了一系列物理、地球化学和微生物工具,以确定西伯利亚远东地区不同侵蚀海岸线的快速冰和浮冰湖沉积物中环境条件、沉积特征、碳储量和微生物群落组成的差异。我们的数据显示,两个湖泊之间的大多数测量参数存在很大差异。例如,浮冰湖含有的沉积物有机质和溶解有机碳含量要低得多,根据其稳定的碳同位素组成(δ13C),与海底冰湖相比,这两种物质似乎都更容易降解。我们还记录了古菌和细菌的微生物群落组成的明显差异。我们确定,湖泊水深(基岩冰与浮冰)和海岸线侵蚀是热岩溶湖泊沉积、微生物和生物地球化学多样性的两个最可能的主要驱动因素。随着气候变暖的持续,越来越多的湖泊可能会从河床状态转变为浮冰状态,海岸线侵蚀程度的增加将为湖泊提供沉积物。然而,人们对这些湖泊类型沉积物的物理、生物地球化学和微生物差异以及不同的侵蚀海岸线如何影响这些湖泊系统知之甚少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Geochemical, sedimentological and microbial diversity in two thermokarst lakes of far Eastern Siberia

Geochemical, sedimentological and microbial diversity in two thermokarst lakes of far Eastern Siberia

Thermokarst lakes are important conduits for organic carbon sequestration, soil organic matter (soil-OM) decomposition and release of atmospheric greenhouse gases in the Arctic. They can be classified as either floating-ice lakes, which sustain a zone of unfrozen sediment (talik) at the lakebed year-round, or as bedfast-ice lakes, which freeze all the way to the lakebed in winter. Another key characteristic of thermokarst lakes are their eroding shorelines, depending on the surrounding landscape, they can play a major role in supplying the lakebeds with sediment and OM. These differences in winter ice regime and eroding shorelines are key factors which determine the quantity and quality of OM in thermokarst lake sediments. We used an array of physical, geochemical, and microbiological tools to identify the differences in the environmental conditions, sedimentary characteristics, carbon stocks and microbial community compositions in the sediments of a bedfast-ice and a floating-ice lake in Far East Siberia with different eroding shorelines. Our data show strong differences across most of the measured parameters between the two lakes. For example, the floating-ice lake contains considerably lower amounts of sediment organic matter and dissolved organic carbon, both of which also appear to be more degraded in comparison to the bedfast-ice lake, based on their stable carbon isotope composition (δ13C). We also document clear differences in the microbial community composition, for both archaea and bacteria. We identified the lake water depth (bedfast-ice vs. floating-ice) and shoreline erosion to be the two most likely main drivers of the sedimentary, microbial and biogeochemical diversity in thermokarst lakes. With ongoing climate warming, it is likely that an increasing number of lakes will shift from a bedfast- to a floating-ice state, and that increasing levels of shoreline erosion will supply the lakes with sediments. Yet, still little is known about the physical, biogeochemical and microbial differences in the sediments of these lake types and how different eroding shorelines impact these lake systems.

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来源期刊
Biogeochemistry
Biogeochemistry 环境科学-地球科学综合
CiteScore
7.10
自引率
5.00%
发文量
112
审稿时长
3.2 months
期刊介绍: Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.
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