High-frequency measurements of productivity of planktonic algae using rugged nondispersive infrared carbon dioxide probes
High-frequency measurements of productivity of planktonic algae using rugged nondispersive infrared carbon dioxide probes
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DOI：
10.4319/lom.2008.6.347
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发表时间：
2008-08-01
影响因子：
2.7
通讯作者：
Ojala, Anne
中科院分区：
文献类型：
--
作者：
Hari, Pertti;Pumpanen, Jukka;Ojala, Anne
我们已经构建了一个系统的基础上，市售廉价的NATIONAL CO2传感器，连续监测水体中的CO2浓度。在这里，我们展示了它的使用在北方腐殖湖泊。通过该系统，我们收集了10分钟时间分辨率的高频数据，用于确定CO2的消耗和生产。我们使用和修改森林生态学中常用的计算方法，使水生初级生产的特点。为了证明该方法的优点，我们提出了对长期监测计划采用传统的瓶子方法的观察结果。通过这些探针，我们可以检测到二氧化碳浓度中清晰的、由光合作用驱动的每日模式，并确定二氧化碳的消耗或产生，从而与传统的孵育方法相比，时间分辨率提高了10倍以上。测量频率足够高，以确定光合作用对辐照度的依赖性。高频数据突出了离散瓶孵育的固有问题，并对其可靠性提出质疑。我们的自由水方法产生的生产力和矿化率明显高于孵化。
We have constructed a system based on commercially available inexpensive NDIR CO2 sensors to continuously monitor CO2 concentrations in water bodies. Here we demonstrate its use in a boreal humic lake. With the system, we collect high frequency data with a 10-min time resolution for determination of CO2 consumption and production. We use and modify the computational methods commonly used in forest ecology to enable characterization of aquatic primary production. To demonstrate the advantages of the method, we present the results against the observations from the long-term monitoring program applying traditional bottle methods. With the probes, we can detect a clear, photosynthesis-driven daily pattern in the CO2 concentration and determine the CO2 consumption or production resulting in more than a 10-fold improvement in the time resolution when compared with traditional incubation methods. The measuring frequency is high enough to determine the dependence of photosynthesis on irradiance. The high-frequency data highlights the inherent problems of discrete bottle incubations and bring into question their reliability. Our free water approach yielded productivity and mineralization rates that were clearly higher than obtained with incubations.