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Fluxes, stocks and availability of nitrogen in evergreen broadleaf and fir forests: similarities and differences

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Abstract

In this study, nitrogen fluxes or flows in litterfall, nitrogen stocks and available nitrogen in soils of two plots representing evergreen broadleaf and Bulgarian fir forests were assessed. Both plots are in good quality sites and for this reason, the litterfall quantities and nitrogen fluxes were relatively high. The woody litterfall flux of nitrogen was significantly higher in the fir forest than in the evergreen broadleaf one. The total nitrogen stock was higher in the soil under the fir forest. However, the percentage of the available nitrogen (ammonium + nitrates) was significantly higher in the upper 20 cm soil layer of the evergreen broadleaf forest in spite of the higher average C/N ratios in the foliar litterfall of the broadleaf forest and insignificant difference of the C/N ratios in all soil layers of the two ecosystems. The microclimatic conditions (higher soil temperatures in the evergreen broadleaf forest) is probable possible cause for this difference. The available nitrogen in the soils and its retranslocation from senescing leaves cover the nitrogen requirements of trees. It is hypothesized that trees may also take up nitrogen from deeper soil layers.

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Acknowledgements

The authors express their appreciation to the Ministry of Agriculture and Food, the Ministry of Environment and the European Commission, which financially sustain the programme “Effects of Atmospheric Pollutants on Forest Ecosystems” on the framework of which the current project was based, and Mrs. Ch. Mitropoulou for her help with sample pretreatment and analysis. Finally, the authors express their gratitude to the Forest Services of Karpenisi and Amfilochia for their invaluable practical assistance with the problems encountered.

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Correspondence to Panagiotis Michopoulos.

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Corresponding editor: Zhu Hong

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This work was supported financially by the Programme of “Effects of Atmospheric Pollutants on Forest Ecosystems” from the Ministry of Agriculture and Food, the Greek Ministry of Environment and the European Commission.

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Michopoulos, P., Bourletsikas, A. & Kaoukis, K. Fluxes, stocks and availability of nitrogen in evergreen broadleaf and fir forests: similarities and differences. J. For. Res. 32, 2059–2066 (2021). https://doi.org/10.1007/s11676-020-01263-y

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