Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2021
Authors
Mihaela-Olivia Dobrica Andre van Eerde Catalin Tucureanu Adrian Onu Lisa Paruch Iuliana Caras Ene Vlase Hege Særvold Steen Sissel Haugslien Dominic Alonzi Nicole Zitzmann Ralph Bock Jean Dubuisson Costin-Ioan Popescu Crina Stavaru Jihong Liu Clarke Norica Branza-NichitaAbstract
No abstract has been registered
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Authors
Wendy Marie Waalen Trygve S. Aamlid Pia Heltoft Thomsen Tatsiana Espevig Marte Skattebu Jan TangsveenAbstract
No abstract has been registered
Abstract
In a young Norway spruce stand (planted in 2012) at Hoxmark, Southeast Norway, Net Ecosystem Exchange (NEE) was measured using Eddy Covariance. The data were carefully processed with time-dependent stand parameters (i.e. canopy height), a detailed footprint analysis and calculated at 30 min temporal resolution. Photosynthetic Active Radiation (PAR) as the primary driver for carbon uptake was also available at the site. Despite its young age, the plantation already acted as a net carbon sink according to the annual NEE budget, e.g. by ca. 300 g C m-2 in 2019. However, the response of the system depended strongly on hydrometeorological conditions. We demonstrate this by investigating the relationship between NEE and PAR for this system in a temporally local fashion (30 days moving windows), using a Michaelis-Menten approach involving three parameters. Although the regression captured up to ca. 80% of the variance, the parameter estimates differed substantially throughout the season, and were contrasting between the very dry year 2018 and the close to normal year 2019. Comparison with other EC-equipped sites in a future study will clarify whether this variable sensitivity is due to the young age or is a pattern pertaining also to mature spruce stands. https://doi.org/10.5194/egusphere-egu21-5028
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Composting and anaerobic digestion are the most common ways to treat organic residues. Sometimes the organic rest after anaerobic digestion is also composted. In this study we investigated greenhouse gas emissions from composting raw food waste compared to composting solid digestate of food waste. Cumulative methane emissions over 3 weeks were found to be almost 12 times higher from composting digested food waste than from raw food waste suggesting that the microbial community transferred from the anaerobic digestion to the compost process enhanced these emissions. Cumulative nitrous oxide emissions were also higher when composting solid digestate was compared to composting raw food waste, but the global warming potential was mostly driven by the impact of methane emissions. In conclusion, methane production during digestate composting can be high, therefore eliminating methane producing microbes in digestate before composting could be a promising way to reduce greenhouse gas emissions.
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Authors
Pia Heltoft Thomsen Karin Juul Hesselsøe Ove Hetland Torben Kastrup Petersen Karin Normann Bjarni Hannesson Agnar Kvalbein Per Rasmussen Kathrine Torday GuldenAbstract
No abstract has been registered