On the calculation of lake metabolic rates: Diel O2 and 18/16O technique.
On the calculation of lake metabolic rates: Diel O2 and 18/16O technique.
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关于湖泊代谢率的计算：Diel O2 和 18/16O 技术。
DOI：
10.1016/j.watres.2019.114990
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发表时间：
2019
期刊：
影响因子：
12.8
通讯作者：
Jorge Encinas Fernández
中科院分区：
文献类型：
--
作者：
F. Peeters;H. Hofmann;Jorge Encinas Fernández
代谢转化对水生系统初级生产者的发展有重大影响，从而影响整个水生食物网的动态。此外，代谢转化有助于碳预算，从而影响CO2排放量从水生系统。已经开发了几种技术，其目的是在长时间内或在许多系统中容易地评估代谢率。18/16 O技术，它利用同位素分馏18 O和16 O同位素之间由于代谢转化，是越来越受欢迎的研究比较代谢在许多不同的湖泊，并作为基础的结论，产量增加，增加大气中的CO2和令人惊讶的是很少陆地碳循环在湖泊的干旱环极景观。然而，我们在这里证明，稳定状态的假设基础上的18/16 O技术造成很大的不确定性，估计代谢率。这一结论是基于一个敏感性分析，使用的数值模型溶解氧，DO，和dissolved 18 O，18 ODO，但也证实了发表的代谢率估计的18/16 O和昼夜O2技术。从the 18/16 O技术获得的代谢率似乎不适合湖泊之间的相关性分析，但可能提供合理的估计，在系统低，长期稳定的生产。此外，我们说明，结合few 18 O测量与昼夜O2技术和逆拟合过程可以提高代谢率的估计，特别是呼吸速率。
Metabolic transformations have a major impact on the development of primary producers in aquatic systems and thus affect the dynamics of the entire aquatic food web. Furthermore, metabolic transformations contribute to the carbon budget and thereby influence CO2emissions from aquatic systems. Several techniques have been developed that aim at an easy assessment of metabolic rates over long time periods or in many systems. The18/16O technique, which utilizes the isotopic fractionation between18O and16O isotopes due to metabolic transformations, is receiving increasing popularity in studies comparing the metabolism in many different lakes and served as basis for the conclusions that production increases with increasing atmospheric CO2and that surprisingly little terrestrial carbon is recycled in lakes of the arid circumpolar landscape. However, we demonstrate here that the steady state assumptions underlying the18/16O technique cause large uncertainties in the estimated metabolic rates. This conclusion is based on a sensitivity analysis using a numerical model of dissolved oxygen,DO, and of dissolved18O,18ODO, but is also confirmed by published metabolic rates estimated from the18/16O and the diel O2techniques. Metabolic rates obtained from the18/16O technique appear unsuited for correlation analyses between lakes but may provide reasonable estimates in systems with low and long-term stable production. In addition we illustrate that the combination of few18O measurements with the diel O2technique and an inverse fitting procedure can improve estimates of metabolic rates and in particular of respiration rates.
气体通量模型选择对 15 个湖泊代谢平衡解释的影响
影响因子：
3.1
作者：
Dugan Hilary A.
通讯作者：
Dugan Hilary A.