Delving deeper: Metabolic processes in the metalimnion of stratified lakes
Delving deeper: Metabolic processes in the metalimnion of stratified lakes
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深入研究：分层湖泊金属离子的代谢过程
DOI：
10.1002/lno.10504
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发表时间：
2017
影响因子：
4.5
通讯作者：
B. Obrador
中科院分区：
文献类型：
--
作者：
D. Giling;P. Staehr;H. Grossart;M. Andersen;B. Boehrer;C. Escot;F. Evrendilek;L. Gómez‐Gener;M. Honti;I. D. Jones;N. Karakaya;Alo Laas;E. Moreno;Karsten Rinke;Ulrike Scharfenberger;Silke R. Schmidt;M. Weber;R. Woolway;Jacob Aaron Zwart;B. Obrador
许多湖泊表现出季节性分层，在此期间，它们发展出强烈的热梯度和化学梯度。深度综合监测计划的扩展为深入了解上混合层以下发生的有机碳加工的重要性提供了见解。然而，代谢和代谢偶联的化学和物理驱动因素仍然没有得到解决，特别是在超水层中。在这个深度区域，光和温度等关键资源的急剧梯度与直接影响代谢过程的动态物理条件共存，同时阻碍了生物活动的准确追踪。我们评估了欧洲和北美10个分层湖泊的metalimnetic代谢及其相关不确定性的驱动因素。我们假设，在清澈的寡营养湖泊中，超水层对整个湖泊的功能有很大的贡献，而在不稳定的多菌混合湖泊中，代谢率变化很大。使用贝叶斯方法，根据昼夜溶解氧曲线对总初级生产力（GPP）和生态系统呼吸（ER）的深度积分速率进行建模。代谢的估计是更不确定的上层以下，但不确定性并不一致的湖泊形态或混合制度。在所有营养状态下，金属湖沼率都表现出很高的日变化性，金属湖沼对每日全湖GPP和ER的贡献分别为0%至87%和< 1%至92%。尽管如此，平均而言，低营养湖泊的metalimonion对整个湖泊的新陈代谢有很大的贡献，这是由高光，低地表水磷浓度和高metalimonetic体积的共线组合驱动的。因此，单传感器方法不一定反映分层湖泊中整个生态系统的碳动态。
Many lakes exhibit seasonal stratification, during which they develop strong thermal and chemical gradients. An expansion of depth‐integrated monitoring programs has provided insight into the importance of organic carbon processing that occurs below the upper mixed layer. However, the chemical and physical drivers of metabolism and metabolic coupling remain unresolved, especially in the metalimnion. In this depth zone, sharp gradients in key resources such as light and temperature co‐occur with dynamic physical conditions that influence metabolic processes directly and simultaneously hamper the accurate tracing of biological activity. We evaluated the drivers of metalimnetic metabolism and its associated uncertainty across 10 stratified lakes in Europe and North America. We hypothesized that the metalimnion would contribute highly to whole‐lake functioning in clear oligotrophic lakes, and that metabolic rates would be highly variable in unstable polymictic lakes. Depth‐integrated rates of gross primary production (GPP) and ecosystem respiration (ER) were modelled from diel dissolved oxygen curves using a Bayesian approach. Metabolic estimates were more uncertain below the epilimnion, but uncertainty was not consistently related to lake morphology or mixing regime. Metalimnetic rates exhibited high day‐to‐day variability in all trophic states, with the metalimnetic contribution to daily whole‐lake GPP and ER ranging from 0% to 87% and < 1% to 92%, respectively. Nonetheless, the metalimnion of low‐nutrient lakes contributed strongly to whole‐lake metabolism on average, driven by a collinear combination of highlight, low surface‐water phosphorous concentration and high metalimnetic volume. Consequently, a single‐sensor approach does not necessarily reflect whole‐ecosystem carbon dynamics in stratified lakes.
影响因子：
4.5
作者：
Kirillin, Georgiy;Grossart, Hans-Peter;Tang, Kam W.
通讯作者：
Tang, Kam W.