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Biogeosciences An interactive open-access journal of the European Geosciences Union
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CO2 and H2O fluxes were measured at a newly established eddy covariance site in southern Finland for two years from 2018 to 2020. This agricultural grassland site focuses on the conversion from intensive towards more sustainable agricultural management. The first summer experienced prolonged dry periods, and notably larger fluxes were observed in the second summer. The carbon balance of the field was close to zero in the first study year. In the second year, the field acted as a net carbon sink.
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https://doi.org/10.5194/bg-2020-422
https://doi.org/10.5194/bg-2020-422

  30 Nov 2020

30 Nov 2020

Review status: this preprint is currently under review for the journal BG.

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

Laura Heimsch1, Annalea Lohila1,2, Juha-Pekka Tuovinen1, Henriikka Vekuri1, Jussi Heinonsalo1,3, Olli Nevalainen1, Mika Korkiakoski1, Jari Liski1, Tuomas Laurila1, and Liisa Kulmala1,3 Laura Heimsch et al.
  • 1Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
  • 2Institute for Atmospheric and Earth System Research, Physics, P.O. Box 64, 00014 University of Helsinki, Finland
  • 3Institute for Atmospheric and Earth System Research, Forest Sciences, P.O. Box 27, 00014 University of Helsinki, Finland

Abstract. A significant proportion of the global carbon emissions to the atmosphere originates 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 two years from May 2018 to May 2020. Especially 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 fertilisers and output as yield. The carbon balance of the field was −50 ± 68 g C m−2 yr−1 and −118 ± 24 g C m−2 yr−1 during the first and second study year, respectively. We estimated that on average the grassland exceeded the global 4 per 1000 goal to increase the soil carbon content.

Laura Heimsch et al.

 
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Laura Heimsch et al.

Laura Heimsch et al.

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Short summary
CO2 and H2O fluxes were measured at a newly established eddy covariance site in southern Finland for two years from 2018 to 2020. This agricultural grassland site focuses on the conversion from intensive towards more sustainable agricultural management. The first summer experienced prolonged dry periods, and notably larger fluxes were observed in the second summer. The carbon balance of the field was close to zero in the first study year. In the second year, the field acted as a net carbon sink.
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