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Critical Nitrogen Deposition Loads in High-elevation Lakes of the Western US Inferred from Paleolimnological Records

机译:根据古生物学记录推算,美国西部高海拔湖泊中的临界氮沉积负荷

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摘要

Critical loads of nitrogen (N) from atmospheric deposition were determined for alpine lake ecosystems in the western US using fossil diatom assemblages in lake sediment cores. Changes in diatom species over the last century were indicative of N enrichment in two areas, the eastern Sierra Nevada, starting between 1960 and 1965, and the Greater Yellowstone Ecosystem, starting in 1980. In contrast, no changes in diatom community structure were apparent in lakes of Glacier National Park. To determine critical N loads that elicited these community changes, we modeled wet nitrogen deposition rates for the period in which diatom shifts first occurred in each area using deposition data spanning from 1980 to 2007. We determined a critical load of 1.4 kg N ha−1 year−1 wet N deposition to elicit key nutrient enrichment effects on diatom communities in both the eastern Sierra Nevada and the Greater Yellowstone Ecosystem.
机译:在美国西部的高山湖泊生态系统中,使用沉积物硅藻中的化石硅藻组合确定了大气沉积中的关键氮负荷。上个世纪硅藻物种的变化表明两个地区的氮富集:内华达山脉东部(始于1960年至1965年)和大黄石生态系统(始于1980年)。相反,硅藻群落结构未见明显变化。冰川国家公园的湖泊。为了确定引起这些群落变化的临界氮负荷,我们使用1980年至2007年的沉积数据对每个区域首次发生硅藻转移的时期的湿氮沉积速率进行了建模。我们确定了1.4 kg N ha −1 年 −1 湿N沉积对内华达山脉东部和大黄石生态系统的硅藻群落产生关键的养分富集效应。

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