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|Title:||The Carbon Balance of European Croplands: A Cross-Site Comparison of Simulation Models|
|Authors:||WATTENBACH Martin; VUICHARD N.; LEHUGER Simon; SUS Oliver; LI Longhui; LEIP Adrian; TORMELLIERI Enrico; KUTSCH W.; BUCHMANN N.; EUGSTER Werner; DIETIKER Dominoque; AUBINET Marc; CESCHIA Eric; BEZIAT Pierre; GRUENWALD Thomas; HASTINGS Ashley; GOTTSCHALK Pia; OSBORNE Bruce; CIAIS Philippe; CELLIER P.; SMITH Pete; WILLIAMS Matthew|
|Citation:||AGRICULTURE ECOSYSTEMS & ENVIRONMENT vol. 139 no. 3 p. 419-453|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in Journals|
|Abstract:||Croplands cover approximately 45% of Europe and play an important role in the overall carbon budget of the continent. However, the estimation of their carbon balance remains uncertain due to the diversity of crops and cropping systems together with the strong influence of human management. Here, we present a multi-site model comparison for four cropland ecosystem models namely theDNDC,ORCHIDEESTICS, CERES-EGC and SPA models. We compare the accuracy of the models in predicting net ecosystem exchange (NEE), gross primary production (GPP), ecosystem respiration (Reco) as well as actual evapotranspiration (ETa) for winter wheat (Triticum aestivum L.) and maize (Zea mays L.) derived from eddy covariance measurements on five sites along a gradient of climatic conditions from eastern to southwesterly Europe. The models are all able to simulate daily GPP. The simulation results for daily ETa and Reco are, however, less accurate. The resulting simulation of daily NEE is adequate except in some cases where models fail due to a lack in phase and amplitude alignment. ORCHIDEE-STICS and SPAshowthe best performance. Nevertheless, they are not able to simulate full crop rotations or the multiple management practices used. CERES-EGC, and especially DNDC, although exhibiting a lower level of model accuracy, are able to simulate such conditions, resulting in more accurate simulation of annual cumulative NEE.|
|JRC Institute:||Institute for Environment and Sustainability|
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