LPJ-GUESS is one of the 14 models following the ISIMIP2a protocol which form the base of simulations for the ISIMIP2a agricultural sector outputs; for a full technical description of the ISIMIP2a Simulation Data from Agricultural Sector, see this DOI link: http://doi.org/10.5880/PIK.2017.006
Stefan Olin (Stefan.Olin@nateko.lu.se), Lund University, Department for Physical Geography and Ecosystem Scince (Sweden)
Land Cover: potential suitable cropland area according to climatic conditions, current harvested areas (Hurtt et al. 2011/Portmann et al., 2010)
Planting Date Decision: Simulate planting dates according to climatic conditions (Waha et al. 2012) or planting dates fixed at present based on S.
Planting Density: planting density=1
Crop Cultivars: Simulate crop Growing Degree Days (GDDs) requirement according to estimated annual GDDs from daily temperature. Vernalization requirements computed based on past climate experience (whe, sunfl, rapes); BT (mai); static (others). No differentiation between varieties other than PHU, except for wheat, which automatically selects between spring and winter varieties according to prevailing climate.
Irrigation: No restriction on actual water availability, irrigated water applied whenever plants would otherwise enter water stress due to soil water limitations.
Crop Residue: N/A, as does not influence yields in this version of LPJ-GUESS.
Initial Soil Water: 30 year spin up
Initial Soil C And Om: Not initialised or spun-up, as they do not influence yields in this version of LPJ-GUESS.
Key model processes
Leaf Area Development: Dynamic simulation based on development and growth processes
Light Interception: Simple approach
Light Utilization: Detailed (explanatory) Gross photosynthesis – respiration, (for more details, see e.g. Adam et al. (2011))
Yield Formation: harvest index modified by water stress
Crop Phenology: temperature, heat unit index
Root Distribution Over Depth: linear
Stresses Involved: Water stress
Type Of Water Stress: ratio of supply to demand of water
Water Dynamics: soil water capacity approach with 2 soil layers
Evapo-Transpiration: Priestley -Taylor
Co2 Effects: Leaf-level photosynthesis-rubisco
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