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https://doi.org/10.5194/soil-2020-76
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-2020-76
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Nov 2020

21 Nov 2020

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This preprint is currently under review for the journal SOIL.

Simulating soil organic C dynamics in managed grasslands under humid temperate climatic conditions

Asma Jebari1, Jorge Álvaro-Fuentes2, Guillermo Pardo1, María Almagro1, and Agustin del Prado1 Asma Jebari et al.
  • 1Basque Centre for Climate Change (BC3), Edificio Sede no. 1, Planta 1, Parque Científico de UPV/EHU, Barrio Sarriena s/n, 48940 Leioa, Bizkaia, Spain
  • 2Estación Experimental de Aula Dei (EEAD), Spanish National Research Council (CSIC), Av. Montañana, 1005, 50059 Zaragoza, Spain

Abstract. Temperate grasslands are of paramount importance in terms of soil organic carbon (SOC) dynamics. Globally, research on SOC dynamics has largely focused on forests, croplands and natural grasslands, while intensively managed grasslands has received much less attention.

In this regard, we aimed to improve the prediction of SOC dynamics in managed grasslands under humid temperate regions. In order to do so, we modified and recalibrated the SOC model RothC, originally developed to model the turnover of SOC in arable topsoils, which requires limited amount of readily available input data. The modifications proposed for the RothC are: (1) water content up to saturation conditions in the soil water function of RothC to fit the humid temperate climatic conditions, (2) entry pools that account for particularity of exogenous organic matter (EOM) applied (e.g., ruminant excreta), (3) annual variation in the carbon inputs derived from plant residues considering both above- and below-ground plant residue and rhizodeposits components as well as their quality, and (4) the livestock treading effect (i.e., poaching damage) as a common problem in humid areas with higher annual precipitation. In the paper, we describe the basis of these modifications, carry out a simple sensitivity analysis and validate predictions against data from existing field experiments from four sites in Europe. Model performance showed that modified RothC reasonably captures well the different modifications. However, the model seems to be more sensitive to soil moisture and plant residues modifications than to the other modifications. The applied changes in RothC model could be appropriate to simulate both farm and regional SOC dynamics from managed grassland-based systems under humid temperate conditions.

Asma Jebari et al.

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Short summary
In order to ensure climate change mitigation via carbon sequestration by temperate grasslands, we suggested modifications to soil organic carbon model to be more adapted to grassland-based livestock systems under humid temperate conditions. The modifications do not impair the performance of the model under temperate conditions and so represent a broadening in its capability. It could be a useful tool for policy makers to develop effective strategies to reduce climate change effect.
In order to ensure climate change mitigation via carbon sequestration by temperate grasslands,...
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