Comparison of observed and modeled annual NPP at seven temperate grassland sites.

a For the nutrient-rich wet grassland at site CZ-mok and N2-fixing grassland at site IT-bea and SE-kje, site simulations were carried out with an addition of 300 kg N ha yr-1 assuming there is no N limitation at the sites.b For the grassland at site SE-kje, 2 NPP observations with meadow fescue ley (740 g C m-2yr-1) and lucerne ley (790 g C m-2yr-1) respectively were averaged to compare with result from ORCHIDEE-GM.Comparison of observed and modeled annual NPP at seven temperate grassland sites.