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Micro-Halocline Enabled Nutrient Recycling May Explain Extreme Azolla Event in the Eocene Arctic Ocean

机译:微盐跃层启用营养循环可能会在始新世北冰洋解释极端事件满江红

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摘要

In order to understand the physicochemical mechanisms that could explain the massive growth of Azolla arctica in the Eocene Arctic Ocean, we carried out a laboratory experiment in which we studied the interacting effects of rain and wind on the development of salinity stratification, both in the presence and in the absence of a dense Azolla cover. Additionally, we carried out a mesocosm experiment to get a better understanding of the nutrient cycling within and beneath a dense Azolla cover in both freshwater and brackish water environments. Here we show that Azolla is able to create a windproof, small-scale salinity gradient in brackish waters, which allows for efficient recycling of nutrients. We suggest that this mechanism ensures the maintenance of a large standing biomass in which additional input of nutrients ultimately result in a further expansion of an Azolla cover. As such, it may not only explain the extent of the Azolla event during the Eocene, but also the absence of intact vegetative Azolla remains and the relatively low burial efficiency of organic carbon during this interval.
机译:为了理解可以解释始新世北冰洋中满江红生长的理化机制,我们进行了一项室内实验,研究了在存在的情况下雨水和风对盐分分层发展的相互作用。并且没有密集的Azolla覆盖物。此外,我们进行了介观试验,以更好地了解淡水和微咸水环境中稠密的Azolla覆盖物内部和下方的养分循环。在这里,我们证明了Azolla能够在微咸水中形成防风的小规模盐度梯度,从而可以有效地循环利用营养物。我们建议这种机制确保维持大量站立的生物质,其中额外的营养输入最终导致Azolla覆盖物的进一步扩展。这样,它不仅可以解释始新世期间发生的Azolla事件的程度,而且可以解释在此间隔期间不存在完整的营养性Azolla残留以及相对较低的有机碳掩埋效率。

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