Record nummer 2253356
Titel artikel Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers
Auteur(s) Bergen, T.J.H.M. van ; Barros, N. ; Mendonça, R. ; Aben, R.C.H. ; Althuizen, I.H.J. ; Huszar, V. ; Lamers, L.P.M. ; Lürling, M. ; Roland, F. ; Kosten, S.
Tijdschrifttitel Limnology and oceanography
Deel(Jaar)Nummer (2019)
Paginering 1 - 11
Online full text
Publicatie type Artikel
Taal Engels
Toelichting Naast rivieren, plassen en sloten blijken ook stadsvijvers veel bij te dragen aan broeikasgasuitstoot. In deze vijvers komen bubbels met het broeikasgas methaan naar het oppervlak. En dit zal alleen nog maar meer toenemen bij hogere temperaturen. De biologen bekeken elke maand hoeveel broeikasgas een stadsvijver in Malden (Gelderland) van iets minder dan 1 hectare groot uitstootte. Daarvoor gebruikten zij een zogeheten greenhouse gas analyser – een apparaat dat meet hoeveel broeikasgassen, zoals CO2 en methaan er aan het wateroppervlak vrijkomen – in het midden en aan de oever van de vijver. En daarnaast vingen de biologen met een trechter methaanbubbels op.
Toelichting (Engels) Small water systems are important hotspots of greenhouse gas (GHG) emission, but estimates are poorly con- strained as data are scarce. Small ponds are often constructed in urban areas, where they receive large amounts of nutrients and therefore tend to be highly productive. Here, we investigated GHG emissions, seasonal and diel variation, and net ecosystem production (NEP) from an urban pond. In monthly 24-h field campaigns during 11 months, diffusive water–atmosphere methane (CH 4 ) and carbon dioxide (CO 2 ) fluxes and CH 4 ebullition and oxidation were quantified. With oxygen (O 2 ) measurements, NEP was assessed. The pond was a net GHG source the entire year, with an emission of 3.4 kg CO 2 eq m −2 yr −1. The dominant GHG emission pathway was CH 4 ebullition (bubble flux, 50%), followed by diffusive emissions of CO 2 (38%) and CH 4 (12%). Sediment CH 4 release was primarily driven by temperature and especially ebullition increased exponentially above a tempera- ture threshold of 15 C. The pond’s atmospheric CO 2 exchange was not related to NEP or temperature but likely to a high allochthonous carbon (C) input via runoff and anaerobic mineralization of C. We expect urban ponds to show a large increase in GHG emission with increasing temperature, which should be considered carefully when constructing ponds in urban areas. Emissions may partly be counteracted by pond management focusing on a reduction of nutrient and organic matter input.
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