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. 2017 Oct 16;7:13243. doi: 10.1038/s41598-017-13781-7

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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N₂O (a) and CO₂ (b) fluxes at beech stem and forest floor level in two beech forest stands (Conventwald, Black Forest; Stitna, White Carpathians) measured during June–July 2015. Negative fluxes indicate N₂O uptake/consumption. Fluxes are expressed per m² of stem or soil surface area, respectively. Stem fluxes were determined for five trees per forest stand (n = 5) at three stem heights with 3–4 measurement repetitions per each height and tree. Stem fluxes from different tree heights are presented together as they did not significantly vary with the tree height. Forest floor fluxes were quantified from 23 (n = 23) and 31 (n = 31) positions randomly distributed within the studied forest stands at Conventwald and Stitna, respectively. Fluxes are expressed as medians (solid lines) and means (broken lines). Boundaries within the boxes indicate 25th and 75th percentiles, and the whiskers 10th and 90th percentiles. Dots mark outliers. Statistically significant differences at p < 0.05 are indicated by asterisk.