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首页> 外文期刊>Aquatic Sciences >Dynamic changes in dissolved organic matter composition in a Mountain Lake under ice cover and relationships to changes in nutrient cycling and phytoplankton community composiion
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Dynamic changes in dissolved organic matter composition in a Mountain Lake under ice cover and relationships to changes in nutrient cycling and phytoplankton community composiion

机译：冰山覆盖下高山湖泊溶解性有机物组成的动态变化及其与养分循环和浮游植物群落组成变化的关系

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We studied Bear Lake, a subalpine oligotrophic lake in Rocky Mountain National Park, Colorado USA, during the winter ice cover period of 2018. Our goal was to understand relationships between biogeochemical and biotic processes and the chemical quality of the dissolved organic matter (DOM), a major pool of organic carbon in all lakes. The lake was stratified with limited light availability and had a consistent oxycline at 7 m. Nutrient concentrations were low and the depletion of nitrogen species was related to increased phytoplankton abundance. The phytoplankton community became progressively dominated by a potentially mixotrophic dinoflagellate species, Gymnodinium sp., and a deep chlorophyll maximum developed above the hypolimnion. Changes in the chemical quality of DOM, as measured through high-resolution mass spectrometry, were associated with these shifts in nutrient and phytoplankton composition. The spectrometry data revealed a pool of organic compounds many of which contained phosphorus, nitrogen, and sulfur. This pool evolved through the winter, with phosphorus-containing compounds becoming more predominant in the upper oxic zone and sulfur-containing compounds becoming more predominant in the anoxic bottom waters. Reduced chemo diversity of the DOM pool in the surface waters developed through the winter. In the bottom waters, more unique compounds were produced through the winter, and the favorability of the DOM to support microbial respiration also increased. These observed differences in DOM molecular composition were not reflected in the spectroscopic signature of the DOM pool. Overall, our results show chemical changes in the DOM pool correlate to dynamic redox conditions, biogeochemical cycling, and biotic response to ice cover.
机译：我们研究了贝尔湖（Bear Lake），这是美国科罗拉多州落基山国家公园的亚高山贫营养湖，在2018年冬季冰盖期。我们的目标是了解生物地球化学和生物过程与溶解有机物（DOM）的化学质量之间的关系。 ，是所有湖泊中主要的有机碳库。该湖被分层，光线有限，并且在7 m处有稳定的奥西林。营养物浓度低，氮素的消耗与浮游植物丰度增加有关。浮游植物群落逐渐由潜在的混合营养性鞭毛藻物种裸子藻属（Gymnodinium sp。）和在次lim虫之上形成的深叶绿素最大值所主导。通过高分辨率质谱法测定的DOM化学质量变化与养分和浮游植物组成的这些变化有关。光谱数据表明，大量有机化合物含有磷，氮和硫。这个池在整个冬季演变，含磷化合物在高氧区变得更加占优势，而含硫化合物在缺氧水域变得更加占优势。整个冬季，地表水中DOM池的化学多样性降低。在整个冬季，在海底产生了更多独特的化合物，而DOM在支持微生物呼吸方面的优势也有所增加。这些观察到的DOM分子组成的差异未反映在DOM库的光谱特征中。总体而言，我们的结果表明DOM池中的化学变化与动态氧化还原条件，生物地球化学循环以及对冰盖的生物响应有关。

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