Carbon dioxide fluxes and carbon balance of an agricultural grassland in southern Finland

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http://hdl.handle.net/10138/332632

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Heimsch , L , Lohila , A , Tuovinen , J-P , Vekuri , H , Heinonsalo , J , Nevalainen , O , Korkiakoski , M , Liski , J , Laurila , T & Kulmala , L 2021 , ' Carbon dioxide fluxes and carbon balance of an agricultural grassland in southern Finland ' , Biogeosciences , vol. 18 , no. 11 , pp. 3467-3483 . https://doi.org/10.5194/bg-18-3467-2021

Julkaisun nimi: Carbon dioxide fluxes and carbon balance of an agricultural grassland in southern Finland
Tekijä: Heimsch, Laura; Lohila, Annalea; Tuovinen, Juha-Pekka; Vekuri, Henriikka; Heinonsalo, Jussi; Nevalainen, Olli; Korkiakoski, Mika; Liski, Jari; Laurila, Tuomas; Kulmala, Liisa
Muu tekijä: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Forest Ecology and Management
University of Helsinki, Finnish Meteorological Institute
University of Helsinki, Department of Forest Sciences
Päiväys: 2021-06-10
Kieli: eng
Sivumäärä: 17
Kuuluu julkaisusarjaan: Biogeosciences
ISSN: 1726-4170
URI: http://hdl.handle.net/10138/332632
Tiivistelmä: A significant proportion of the global carbon emissions to the atmosphere originate from agriculture. Therefore, continuous long-term monitoring of CO2 fluxes is essential to understand the carbon dynamics and balances of different agricultural sites. Here we present results from a new eddy covariance flux measurement site located in southern Finland. We measured CO2 and H2O fluxes at this agricultural grassland site for 2 years, from May 2018 to May 2020. In particular the first summer experienced prolonged dry periods, which affected the CO2 fluxes, and substantially larger fluxes were observed in the second summer. During the dry summer, leaf area index (LAI) was notably lower than in the second summer. Water use efficiency increased with LAI in a similar manner in both years, but photosynthetic capacity per leaf area was lower during the dry summer. The annual carbon balance was calculated based on the CO2 fluxes and management measures, which included input of carbon as organic fertilizers and output as yield. The carbon balance of the field was -57 +/- 10 and -86 +/- 12 g C m(-2) yr(-1) in the first and second study years, respectively.
Avainsanat: 114 Physical sciences
4112 Forestry
1172 Environmental sciences
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