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Article

Evaluation of LandscapeDNDC Model Predictions of CO2 and N2O Fluxes from an Oak Forest in SE England

1
Department of Earth Sciences, Royal Holloway, University of London, Egham TW20 0EX, UK
2
Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research, Atmospheric Environmental Research, Kreuzeckbahnstraße 19, 82467 Garmisch-Partenkirchen, Germany
3
Forest Research, Alice Holt Lodge, Farnham GU10 4LH, UK
*
Author to whom correspondence should be addressed.
Academic Editors: Guy R. LaRocque, Weifeng Wang, Herman H. Shugart, Vladimir Shanin and Olga Viedma
Forests 2021, 12(11), 1517; https://doi.org/10.3390/f12111517
Received: 14 August 2021 / Revised: 24 October 2021 / Accepted: 27 October 2021 / Published: 3 November 2021
(This article belongs to the Special Issue Simulation Models of the Dynamics of Forest Ecosystems)
Process-based biogeochemical models are valuable tools to evaluate impacts of environmental or management changes on the greenhouse gas (GHG) balance of forest ecosystems. We evaluated LandscapeDNDC, a process-based model developed to simulate carbon (C), nitrogen (N) and water cycling at ecosystem and regional scales, against eddy covariance and soil chamber measurements of CO2 and N2O fluxes in an 80-year-old deciduous oak forest. We compared two LandscapeDNDC vegetation modules: PSIM (Physiological Simulation Model), which includes the understorey explicitly, and PnET (Photosynthesis–Evapotranspiration Model), which does not. Species parameters for both modules were adjusted to match local measurements. LandscapeDNDC was able to reproduce daily micro-climatic conditions, which serve as input for the vegetation modules. The PSIM and PnET modules reproduced mean annual net CO2 uptake to within 1% and 15% of the measured values by balancing gains and losses in seasonal patterns with respect to measurements, although inter-annual variations were not well reproduced. The PSIM module indicated that the understorey contributed up to 21% to CO2 fluxes. Mean annual soil CO2 fluxes were underestimated by 32% using PnET and overestimated by 26% with PSIM; both modules simulated annual soil N2O fluxes within the measured range but with less interannual variation. Including stand structure information improved the model, but further improvements are required for the model to predict forest GHG balances and their inter-annual variability following climatic or management changes. View Full-Text
Keywords: process-based modelling; simulations; forest management; forest soils; greenhouse gas fluxes; eddy covariance; chamber flux measurement process-based modelling; simulations; forest management; forest soils; greenhouse gas fluxes; eddy covariance; chamber flux measurement
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MDPI and ACS Style

Cade, S.M.; Clemitshaw, K.C.; Molina-Herrera, S.; Grote, R.; Haas, E.; Wilkinson, M.; Morison, J.I.L.; Yamulki, S. Evaluation of LandscapeDNDC Model Predictions of CO2 and N2O Fluxes from an Oak Forest in SE England. Forests 2021, 12, 1517. https://doi.org/10.3390/f12111517

AMA Style

Cade SM, Clemitshaw KC, Molina-Herrera S, Grote R, Haas E, Wilkinson M, Morison JIL, Yamulki S. Evaluation of LandscapeDNDC Model Predictions of CO2 and N2O Fluxes from an Oak Forest in SE England. Forests. 2021; 12(11):1517. https://doi.org/10.3390/f12111517

Chicago/Turabian Style

Cade, Shirley M., Kevin C. Clemitshaw, Saúl Molina-Herrera, Rüdiger Grote, Edwin Haas, Matthew Wilkinson, James I.L. Morison, and Sirwan Yamulki. 2021. "Evaluation of LandscapeDNDC Model Predictions of CO2 and N2O Fluxes from an Oak Forest in SE England" Forests 12, no. 11: 1517. https://doi.org/10.3390/f12111517

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