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Haylands are the mildest option for the agricultural use of drained peatlands in terms of CO 2  emissions. However, CO 2  fluxes and their balance may depend on various conditions including the frequency of mowing and amount of phytomass removed. Based on field measurements of CO 2  fluxes using the chamber method and monitoring of environmental factors conducted in 2018–2020 on hayland and fallow on drained peatland in central European Russia, a mathematical model of CO 2  balance was built. Numerical experiments showed that mowing of hayland, irrespective of the intensity, did not lead to an increase in CO 2  emissions compared to fallow. Fallow and hayland after single mowing had closely modelled net ecosystem exchange (NEE) values: 9.9 ± 2.4 and 8.5 ± 2.7 t C ha −1  season −1 , respectively. Furthermore, a single mowing turned out 2.8 t ha −1  of hay (0.8 ± 0.1 t C ha −1 ), and 4.4 (1.4 ± 0.1) after double mowing. The modelled NEE after double mowing increased to 9.4 ± 2.9 t C ha −1  season −1 . A single mowing session in early summer is recommended. Compared to other uses, e.g. arable land, mowing on hayland is a compromise between reducing CO 2  emissions and gaining economic benefits from drained peatlands.

Net ecosystem exchange of carbon dioxide on hayland with drained peat soil in central European Russia: mowing scenario analysis