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Sediment cores from shallow lakes preserve reliable, informative paleoenvironmental archives despite hurricane-force winds

机译：尽管有飓风的影响，来自浅水湖泊的沉积物芯仍保留了可靠的，内容丰富的古环境档案

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Comparison of sediment cores collected in 1999 and 2013 from shallow Lake Harris, Florida, USA showed that the sediment maintained stratigraphic integrity despite multiple hurricanes passing through the area in 2004. Sediments less than 50 years old displayed small losses of organic matter (OM), total phosphorus (TP) and heat-extractable (HE-P) through time that are unrelated to hurricane impacts. Nevertheless, sediment that accumulated between the two core collection dates contained 4-fold more TP than was lost from the sediment over the 14-year period, indicating that sediments in lake Harris are a net sink for water-column TP. Persistent, elevated Cs-137 activity in sediments deposited since the mid-1960s indicates protracted cesium input to the lake from this subtropical watershed. There is also evidence for downward transport of Cs-137 in the sediment profile between core collection dates. Prolonged export of Cs-137 from the watershed and downward mobility of the radionuclide in the sediment profile diminish the utility of Cs-137 as a dating tool in Lake Harris. (C) 2015 Elsevier Ltd. All rights reserved.
机译：比较1999年和2013年从美国佛罗里达州哈里斯湖浅水区收集到的沉积物芯，发现尽管2004年飓风经过该地区，沉积物仍保持地层完整性。小于50年的沉积物显示出少量的有机质（OM）损失，随时间变化的总磷（TP）和可热萃取（HE-P），与飓风的影响无关。然而，在两个核心收集日之间积累的沉积物所含的总磷比在14年期间从沉积物中损失的多4倍，这表明哈里斯湖中的沉积物是水柱总磷的净汇。自1960年代中期以来，沉积物中持久的Cs-137活性持续升高，表明铯从该亚热带流域长期输入到湖泊中。也有证据表明在核心采集日期之间，Cs-137在沉积物剖面中的向下迁移。流域中Cs-137的长时间出口以及沉积物剖面中放射性核素的向下迁移，削弱了Cs-137作为哈里斯湖定年工具的效用。 （C）2015 Elsevier Ltd.保留所有权利。

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