Metabolic and physiochemical responses to a whole‐lake experimental increase in dissolved organic carbon in a north‐temperate lake
Metabolic and physiochemical responses to a whole‐lake experimental increase in dissolved organic carbon in a north‐temperate lake
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北温带湖泊全湖溶解有机碳实验增加的代谢和理化反应
DOI：
10.1002/lno.10248
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发表时间：
2016
影响因子：
4.5
通讯作者：
Stuart E. Jones
中科院分区：
文献类型：
--
作者：
Jacob Aaron Zwart;N. Craig;P. Kelly;S. Sebestyen;C. Solomon;B. Weidel;Stuart E. Jones
在过去的几十年里，全球许多湖泊的溶解有机碳（DOC）都在增加，这引发了湖泊功能如何响应DOC增加的问题。不幸的是，我们做出预测的基础仅限于空间调查、建模和实验室实验，这可能无法准确捕捉重要的整个生态系统过程。在这篇文章中，我们提供了多年实验全湖DOC浓度增加的代谢和物理化学响应数据。出乎意料的是，我们观察到远洋总初级产量的增加，可能是由于磷的少量增加，以及令人惊讶的缺乏变化的前期轻气候。我们还推测了湖泊大小对轻度气候和DOC升高之间关系的影响。生态系统呼吸的较大增加导致处理盆地异养性增加。异养性增加的幅度与处理池的过量DOC负荷非常接近，这表明如果外来碳负荷得到很好的约束，异养性的变化是可以预测的。升高的DOC浓度也降低了温跃层和混合层深度，降低了全湖温度。该实验的结果在数量上与基于跨系统调查和瓶子实验的预期不同，有时甚至是相反的方向，强调了整个生态系统实验在理解生态系统对环境变化的响应中的重要性。
Over the last several decades, many lakes globally have increased in dissolved organic carbon (DOC), calling into question how lake functions may respond to increasing DOC. Unfortunately, our basis for making predictions is limited to spatial surveys, modeling, and laboratory experiments, which may not accurately capture important whole‐ecosystem processes. In this article, we present data on metabolic and physiochemical responses of a multiyear experimental whole‐lake increase in DOC concentration. Unexpectedly, we observed an increase in pelagic gross primary production, likely due to a small increase in phosphorus as well as a surprising lack of change in epilimnetic light climate. We also speculate on the importance of lake size modifying the relationship between light climate and elevated DOC. A larger increase in ecosystem respiration resulted in an increased heterotrophy for the treatment basin. The magnitude of the increase in heterotrophy was extremely close to the excess DOC load to the treatment basin, indicating that changes in heterotrophy may be predictable if allochthonous carbon loads are well‐constrained. Elevated DOC concentration also reduced thermocline and mixed layer depth and reduced whole‐lake temperature. Results from this experiment were quantitatively different, and sometimes even in the opposite direction, from expectations based on cross‐system surveys and bottle experiments, emphasizing the importance of whole‐ecosystem experiments in understanding ecosystem response to environmental change.
影响因子：
11.6
作者：
Evans, Christopher D.;Chapman, Pippa J.;Cresser, Malcolm S.
通讯作者：
Cresser, Malcolm S.