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Diel and monthly observations of plant mediated fluxes of methane, carbon dioxide and nitrous oxide from lake Följesjön in Sweden using static chamber method
Linköping University, Faculty of Arts and Sciences. Linköping University, The Tema Institute.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

Aquatic plants or macrophytes are known as conduits of Methane (CH4), Carbon dioxide (CO2) and Nitrous oxide (N2O) which contribute to the total fluxes of the Greenhouse gases emissions from lakes. Recent studies emphasized that the knowledge on plant mediated emissions calls for more systematic and comparative data especially in the areas of spatial and temporal variability. In this study I measured diel (24 hour) and diurnal(  daily hours only) plant mediated fluxes during four sampling sessions using chamber method from a  Swedish lake in summer 2012. The measurements were conducted on two macrophyte population patterns of mixed plant communities and Equisetum fluviatile (specie-specific) community. CH4 emissions were higher in darker hours and there were no diel correlation between CH4 fluxes and average diel temperature. CH4 fluxes varied between 0.42 mmol m-2d-1 and 2.3 mmol m-2d-1. The CO2 fluxes had negative fluxes in day and positive during the day which was logical due to macrophyte respiration and photosynthesis mechanisms. Occasional daily positive fluxes were seen (only) during the rainy hours and there were no correlation between temperature and diel CO2 fluxes. The total net CO2 exchange was 2.8mmol m-2d-1 indicating that there was more CO2 release in the littoral zone of that lake. N2O fluxes did not show any clear diel or monthly pattern and the fluxes ranged between positive and negative numbers. The N2O fluxes did not exceed 2µmol m-2 d-1 with the total average flux of 0.8µmol m-2 d-1.

Place, publisher, year, edition, pages
2013. , 54 p.
Keyword [en]
CH4 flux, CO2 flux, N2O flux, macrophytes, E.fluviatile, mixed sampling, diel sampling, chamber method.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-99571ISRN: LIU-TEMAV/MPSSD-A-13/015- -SEOAI: oai:DiVA.org:liu-99571DiVA: diva2:657373
Subject / course
Master´s Programme in Science for Sustainable Development, 120 ects
Presentation
2013-09-18, TEM21, Linköping University- Department of thematic Studies, Linköping, 09:00 (English)
Supervisors
Examiners
Available from: 2013-10-23 Created: 2013-10-18 Last updated: 2013-10-23Bibliographically approved

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Houtan Radpour -Master's thesis(2326 kB)207 downloads
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