Spatial and Temporal Variability of Nutrient Dynamics and Ecosystem Metabolism in a Hyper-eutrophic Reservoir Differ Between a Wet and Dry Year
Spatial and Temporal Variability of Nutrient Dynamics and Ecosystem Metabolism in a Hyper-eutrophic Reservoir Differ Between a Wet and Dry Year
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富营养化水库养分动态和生态系统代谢的时空变化在丰水年和旱年之间存在差异
DOI：
10.1007/s10021-020-00505-8
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Renwick, William H.
中科院分区：
文献类型：
--
作者：
Williamson, Tanner J.;Vanni, Michael J.;Renwick, William H.
气候变化改变了水文系统，包括其变异性。对水生生态系统的影响将是显著的，在那里，资源补贴（例如，养分、碳）驱动关键的生态系统过程。然而，我们所知甚少，如何改变水文制度将调节湖泊地球化学和生态系统代谢的时空动态。为了解决这个问题，我们量化了生态系统的代谢和营养dynamicsat高空间分辨率在阿克顿湖，在美国中西部的超富营养化水库。我们捕获了两个连续的生长季节，具有显着不同的流域流量和营养负荷。在丰水和干旱年份，时间变异性往往超过空间变异性。然而，相对空间变异性较高，在干旱的年份，这表明内部过程更重要的结构空间动态在干旱年份。引人注目的是，流域排放量和营养负荷的显着差异，在许多湖泊指标产生相对较小的差异，这表明水文变化的弹性。我们发现，丰水年和干旱年的总初级生产力差异不大，但生态系统呼吸在丰水年较高，使生态系统净生产力低于零。离散风暴事件产生强烈的，但短暂的和空间明确的影响，反映了流输入和流量的平衡在大坝。限制营养素的增加仅限于溪流入口附近，并在几天内恢复到风暴前的基线。生态系统的新陈代谢被抑制在风暴事件，可能是由于生物量冲洗。了解如何改变水文制度将调解时空动态的生态系统指标是至关重要的，以保持生态完整性和生态系统服务的湖泊在未来的气候。
Climate change alters hydrologic regimes, including their variability. Effects will be pronounced in aquatic ecosystems, where resource subsidies (e.g., nutrients, carbon) drive key ecosystem processes. However, we know little about how changing hydrologic regimes will modulate the spatiotemporal dynamics of lake biogeochemistry and ecosystem metabolism. To address this, we quantified ecosystem metabolism and nutrient dynamicsat high spatial resolution in Acton Lake, a hyper-eutrophic reservoir in the Midwestern US. We captured two consecutive growing seasons with markedly different watershed discharge and nutrient loading. Temporal variability often exceeded spatial variability in both wet and dry years. However, relative spatial variability was higher in the dry year, suggesting that internal processes are more important in structuring spatial dynamics in dry years. Strikingly, marked differences in watershed discharge and nutrient loading between years produced relatively small differences in many lake metrics, suggesting resilience to hydrologic variability. We found little difference in gross primary productivity between wet and dry years, but ecosystem respiration was higher in the wet year, shifting net ecosystem production below zero. Discrete storm events produced strong, yet ephemeral and spatially explicit effects, reflective of the balance of stream input and discharge over the dam. Increases in limiting nutrients were restricted to near stream inlets and returned to pre-storm baseline within days. Ecosystem metabolism was suppressed during storm events, likely due to biomass flushing. Understanding how changing hydrologic regimes will mediate spatiotemporal dynamics of ecosystem metrics is paramount to preserving the ecological integrity and ecosystem services of lakes under future climates.
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影响因子：
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