Carbon dioxide fluxes and carbon balance of an agricultural grassland in southern Finland
-
Published:2021-06-10
Issue:11
Volume:18
Page:3467-3483
-
ISSN:1726-4189
-
Container-title:Biogeosciences
-
language:en
-
Short-container-title:Biogeosciences
Author:
Heimsch Laura, Lohila AnnaleaORCID, Tuovinen Juha-PekkaORCID, Vekuri Henriikka, Heinonsalo JussiORCID, Nevalainen OlliORCID, Korkiakoski MikaORCID, Liski Jari, Laurila TuomasORCID, Kulmala LiisaORCID
Abstract
Abstract. 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.
Funder
Business Finland Academy of Finland
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
Reference69 articles.
1. Abraha, M., Gelfand, I., Hamilton, S. K., Shao, C., Su, Y.-J., Robertson,
G. P., and Chen, J.: Ecosystem water-use efficiency of annual corn and
perennial grasslands: contributions from land-use history and species
composition, Ecosystems, 19, 1001–1012, https://doi.org/10.1007/s10021-016-9981-2,
2016. a 2. Aubinet, M., Vesala, T., and Papale, D.: Eddy Covariance: A Practical Guide to Measurement and Data Analysis, Springer, Dordrecht, The Netherlands, 438 pp., https://doi.org/10.1007/978-94-007-2351-1, 2012. a, b 3. Aurela, M., Laurila, T., and Tuovinen, J.-P.: Annual CO2 balance of a
subarctic fen in northern Europe: importance of the wintertime efflux,
J. Geophys. Res.-Atmos., 107, 4607, https://doi.org/10.1029/2002JD002055, 2002. a 4. Baldocchi, D., Chu, H., and Reichstein, M.: Inter-annual variability of net
and gross ecosystem carbon fluxes: A review, Agr. Forest Meteorol., 249, 520–533, https://doi.org/10.1016/j.agrformet.2017.05.015, 2018. a 5. Baldocchi, D. D.: Assessing the eddy covariance technique for evaluating carbon dioxide exchange rates of ecosystems: past, present and future,
Global Change Biol., 9, 479–492, https://doi.org/10.1046/j.1365-2486.2003.00629.x, 2003. a
Cited by
18 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|