Partitioning inorganic carbon fluxes from paired O2–CO2 gas measurements in a Neotropical headwater stream, Costa Rica

Partitioning inorganic carbon fluxes from paired O2–CO2 gas measurements in a Neotropical headwater stream, Costa Rica
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从哥斯达黎加新热带源头水流中成对的 O2-CO2 气体测量中划分无机碳通量

DOI:
10.1007/s10533-022-00954-4
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发表时间:
2022
期刊:
影响因子:
4
通讯作者:
Ardón, Marcelo
Ardón, Marcelo
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Marzolf, Nicholas S.;Small, Gaston E.;Oviedo-Vargas, Diana;Ganong, Carissa N.;Duff, John H.;Ramírez, Alonso;Pringle, Catherine M.;Genereux, David P.;Ardón, Marcelo

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溪流和河流在全球碳(C)循环中的作用仍然不受限制,特别是在向大气逃逸二氧化碳(FCO2)高的源头溪流中。与温带河流相比,热带河流的溪流C循环研究不足,由于较高的温度、持续的有机物输入以及河流内和周围土壤的高呼吸速率,热带河流可能具有最高的fco2。在本文中,我们提供了来自哥斯达黎加低地雨林源头的成对流中o2和co2传感器数据,以探索气体浓度和生态系统过程的时间变化。此外,我们从河岸井的二氧化碳测量中估计地下水二氧化碳输入(GWCO2)。配对的o2 - CO2数据揭示了地下水CO2输入和大量的河流内CO2生产驱动的河流CO2过饱和。在短时间尺度上,co2在风暴事件期间被稀释,但在较长的季节尺度上增加。本研究的面积通量表明,与GWCO2相比,fco2得到了更大的流内代谢支持。我们的研究结果强调了热带水源作为大气二氧化碳的主要贡献者的重要性,并表明逃避的碳可以来自河流和陆地来源。
The role of streams and rivers in the global carbon (C) cycle remains unconstrained, especially in headwater streams where CO2evasion (FCO2) to the atmosphere is high. Stream C cycling is understudied in the tropics compared to temperate streams, and tropical streams may have among the highest FCO2due to higher temperatures, continuous organic matter inputs, and high respiration rates both in-stream and in surrounding soils. In this paper, we present paired in-stream O2and CO2sensor data from a headwater stream in a lowland rainforest in Costa Rica to explore temporal variability in gas concentrations and ecosystem processes. Further, we estimate groundwater CO2inputs (GWCO2) from riparian well CO2measurements. Paired O2–CO2data reveal stream CO2supersaturation driven by groundwater CO2inputs and large in-stream production of CO2. At short time scales, CO2was diluted during storm events, but increased at longer seasonal scales. Areal fluxes in our study reach show that FCO2is supported by greater in-stream metabolism compared to GWCO2. Our results underscore the importance of tropical headwater streams as large contributors of carbon dioxide to the atmosphere and show evaded C can be derived from both in-stream and terrestrial sources.
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