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Rolinski, Susanne; Müller, Christoph; Heinke, Jens; Weindl, Isabelle; Biewald, Anne; Bodirsky, Benjamin Leon; Bondeau, Alberte; Boons-Prins, Eltje R.; Bouwman, Alexander F.; Leffelaar, Peter A.; Roller, Johnny A.; Schaphoff, Sibyll; Thonicke, Kirsten (2017)
Languages: English
Types: Article
Subjects:
Grassland management directly affects the carbon fluxes of large areas and is thus an important factor for the global carbon budget. Nonetheless, this aspect has been largely ignored or underrepresented in global carbon cycle models. We introduce three different management schemes for the managed grassland implementation of the DGVM LPJmL that facilitate a better representation of actual management systems globally. We describe the model implementation and evaluate model performance against European data. We demonstrate the importance of accounting for differences in grassland management by assessing maximum livestock grazing densities as well as the impacts of grazing, grazing intensities and mowing systems on soil carbon stocks. Grazing leads to soil carbon losses in polar or arid regions even at moderate livestock densities (< 0.4 LSU ha−1) but not in temperate regions even at much higher densities (0.4 to 1.2 LSU ha−1). Applying LPJmL 3.6 with the new grassland management options enables assessments of global meat production and its impact on the terrestrial biogeochemical cycles, but requires a global data set on current grassland management.
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