Organic carbon sedimentation dominates over CO2 emission in two net heterotrophic Mediterranean reservoirs during stratification

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• 作者：María Morales-Pineda ; Bárbara Úbeda ; Andrés Cózar ; Biel Obrador…
• 关键词：CO 2 emission ; Sedimentation ; pCO2 ; Particulate organic carbon ; Reservoirs ; Stratified period
• 刊名：Aquatic Sciences - Research Across Boundaries
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：78
• 期：2
• 页码：279-290
• 全文大小：737 KB
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• 作者单位：María Morales-Pineda (1)
  Bárbara Úbeda (1)
  Andrés Cózar (1)
  Biel Obrador (2)
  José Á. Gálvez (1)
  
  1. Department of Biology, Faculty of Marine and Environmental Science, University of Cadiz, 11510, Puerto Real, (Cádiz), Spain
  2. Department of Ecology, Faculty of Biology, University of Barcelona, 08028, Barcelona, Barcelona, Spain
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Oceanography
  Life Sciences
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9055

文摘

Freshwater reservoirs are significant components of the global carbon cycle. However, relatively few studies address the balance between the atmospheric carbon flux and sedimentation in these ecosystems. We performed a simultaneous analysis of the sedimentation fluxes of particulate organic carbon (S_POC) and atmospheric CO₂ fluxes (\( {\text{F}}_{{{\text{CO}}_{ 2} }} \)) in the epilimnetic zone of two monomictic Mediterranean reservoirs. CO₂ partial pressure (pCO2) was monitored hourly, and S_POC was measured at biweekly intervals with sediment traps during the stratification period. Both reservoirs were zones of intense organic carbon sedimentation and CO₂ emission to the atmosphere despite having different trophic statuses. The positive relationship observed between S_POC and \( {\text{F}}_{{{\text{CO}}_{ 2} }} \) was likely due to the inputs of organic matter and nutrients to the epilimnion, which increased both sedimentation and CO₂ emission. Nonetheless, the stronger effect on the sedimentation process led to a net downward flux of carbon in spite of the heterotrophic nature of both reservoirs.