Keywords
Grassland; Modelling; Plant acclimation
Location
Session B2: Advances in Agricultural Modelling
Start Date
11-7-2016 10:50 AM
End Date
11-7-2016 11:10 AM
Abstract
The temperature responses of plant photosynthesis and respiration observed on single-plant species can be assumed to occur at the scale of a grassland ecosystem (which is a dynamic and competitive associations of plants). Based on the model for a single, fully expanded leaf as derived from experimental evidence and to gain insights into acclimatory and modulatory effects of growth temperature, we have: 1) improved a complex soil-vegetation-management model of grasslands, PaSim (Pasture Simulation model), and 2) evaluated it on multi-year datasets of plant biomass and C-water- energy fluxes in managed grassland systems. Illustrative results are presented for the French grassland site of Laqueuille, by comparing two grazing management treatments: high animal stocking rate and high nitrogen fertilisation (intensive) and low animal stocking rate with no fertilization (extensive). Model performances (reflected by mean square error, index of agreement and correlation coefficient) showed that accounting for plant acclimatory effects may help improving water and respiratory fluxes. However the pattern of results is generally complex (e.g. differences between management options), and a substantiation of results is required by assessing model performances on a range of sites and contrasting conditions (as listed in the paper).
Included in
Civil Engineering Commons, Data Storage Systems Commons, Environmental Engineering Commons, Hydraulic Engineering Commons, Other Civil and Environmental Engineering Commons
The Pasture Simulation model – evaluation of plant acclimatory effects on grassland systems in France
Session B2: Advances in Agricultural Modelling
The temperature responses of plant photosynthesis and respiration observed on single-plant species can be assumed to occur at the scale of a grassland ecosystem (which is a dynamic and competitive associations of plants). Based on the model for a single, fully expanded leaf as derived from experimental evidence and to gain insights into acclimatory and modulatory effects of growth temperature, we have: 1) improved a complex soil-vegetation-management model of grasslands, PaSim (Pasture Simulation model), and 2) evaluated it on multi-year datasets of plant biomass and C-water- energy fluxes in managed grassland systems. Illustrative results are presented for the French grassland site of Laqueuille, by comparing two grazing management treatments: high animal stocking rate and high nitrogen fertilisation (intensive) and low animal stocking rate with no fertilization (extensive). Model performances (reflected by mean square error, index of agreement and correlation coefficient) showed that accounting for plant acclimatory effects may help improving water and respiratory fluxes. However the pattern of results is generally complex (e.g. differences between management options), and a substantiation of results is required by assessing model performances on a range of sites and contrasting conditions (as listed in the paper).
