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Article

Silvicultural Interventions Drive the Changes in Soil Organic Carbon in Romanian Forests According to Two Model Simulations

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Department of Silviculture, Transilvania University of Brasov, Sirul Beethoven, 1, 500123 Brasov, Romania
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Finnish Meteorological Institute, Erik Palménin Aukio 1, FI-00560 Helsinki, Finland
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Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, University of Helsinki, FI-00014 Helsinki, Finland
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National Institute for Research and Development in Silviculture “Marin Dracea”, Eroilor 128, 077190 Voluntari, Romania
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Buckinghamshire New University, Queen Alexandra Rd, High Wycombe HP11 2JZ, UK
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Author to whom correspondence should be addressed.
Academic Editor: George L. Vourlitis
Forests 2021, 12(6), 795; https://doi.org/10.3390/f12060795
Received: 24 April 2021 / Revised: 9 June 2021 / Accepted: 13 June 2021 / Published: 16 June 2021
(This article belongs to the Section Forest Inventory, Modeling and Remote Sensing)
We investigated the effects of forest management on the carbon (C) dynamics in Romanian forest soils, using two model simulations: CBM-CFS3 and Yasso15. Default parametrization of the models and harmonized litterfall simulated by CBM provided satisfactory results when compared to observed data from National Forest Inventory (NFI). We explored a stratification approach to investigate the improvement of soil C prediction. For stratification on forest types only, the NRMSE (i.e., normalized RMSE of simulated vs. NFI) was approximately 26%, for both models; the NRMSE values reduced to 13% when stratification was done based on climate only. Assuming the continuation of the current forest management practices for a period of 50 years, both models simulated a very small C sink during simulation period (0.05 MgC ha−1 yr−1). Yet, a change towards extensive forest management practices would yield a constant, minor accumulation of soil C, while more intensive practices would yield a constant, minor loss of soil C. For the maximum wood supply scenario (entire volume increment is removed by silvicultural interventions during the simulated period) Yasso15 resulted in larger emissions (−0.3 MgC ha−1 yr−1) than CBM (−0.1 MgC ha−1 yr−1). Under ‘no interventions’ scenario, both models simulated a stable accumulation of C which was, nevertheless, larger in Yasso15 (0.35 MgC ha−1 yr−1) compared to CBM-CSF (0.18 MgC ha−1 yr−1). The simulation of C stock change showed a strong “start-up” effect during the first decade of the simulation, for both models, explained by the difference in litterfall applied to each scenario compared to the spinoff scenario. Stratification at regional scale based on climate and forest types, represented a reasonable spatial stratification, that improved the prediction of soil C stock and stock change. View Full-Text
Keywords: model intercomparison; CBM-CFS3; Yasso15; silvicultural scenarios; litterfall dynamic model intercomparison; CBM-CFS3; Yasso15; silvicultural scenarios; litterfall dynamic
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MDPI and ACS Style

Blujdea, V.N.B.; Viskari, T.; Kulmala, L.; Gârbacea, G.; Dutcă, I.; Miclăuș, M.; Marin, G.; Liski, J. Silvicultural Interventions Drive the Changes in Soil Organic Carbon in Romanian Forests According to Two Model Simulations. Forests 2021, 12, 795. https://doi.org/10.3390/f12060795

AMA Style

Blujdea VNB, Viskari T, Kulmala L, Gârbacea G, Dutcă I, Miclăuș M, Marin G, Liski J. Silvicultural Interventions Drive the Changes in Soil Organic Carbon in Romanian Forests According to Two Model Simulations. Forests. 2021; 12(6):795. https://doi.org/10.3390/f12060795

Chicago/Turabian Style

Blujdea, Viorel N.B., Toni Viskari, Liisa Kulmala, George Gârbacea, Ioan Dutcă, Mihaela Miclăuș, Gheorghe Marin, and Jari Liski. 2021. "Silvicultural Interventions Drive the Changes in Soil Organic Carbon in Romanian Forests According to Two Model Simulations" Forests 12, no. 6: 795. https://doi.org/10.3390/f12060795

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