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. Canopy nitrogen (N) concentration and content are linked to severalvegetation processes. Therefore, canopy N concentration is a state variablein global vegetation models with coupled carbon (C) and N cycles. While thereare ample C data available to constrain the models, widespread N data arelacking. Remotely sensed vegetation indices have been used to detect canopy Nconcentration and canopy N content at the local scale in grasslands andforests. Vegetation indices could be a valuable tool to detect canopy Nconcentration and canopy N content at larger scale. In this paper, weconducted a regional case-study analysis to investigate the relationshipbetween the Medium Resolution Imaging Spectrometer (MERIS) TerrestrialChlorophyll Index (MTCI) time series from European Space Agency (ESA) Envisat satellite at 1 km spatialresolution and both canopy N concentration (%N) and canopy N content(N g m −2 , of ground area) from a Mediterranean forest inventory in theregion of Catalonia, in the northeast of Spain. The relationships between the datasets werestudied after resampling both datasets to lower spatial resolutions (20, 15,10 and 5 km) and at the original spatial resolution of 1 km. The results athigher spatial resolution (1 km) yielded significant log–linearrelationships between MTCI and both canopy N concentration and content: r2 =  0.32 and r2 =  0.17, respectively. We also investigatedthese relationships per plant functional type. While the relationship betweenMTCI and canopy N concentration was strongest for deciduous broadleaf andmixed plots ( r2 =  0.24 and r2 =  0.44, respectively), therelationship between MTCI and canopy N content was strongest for evergreenneedleleaf trees ( r2 =  0.19). At the species level, canopy Nconcentration was strongly related to MTCI for European beech plots( r2 =  0.69). These results present a new perspective on theapplication of MTCI time series for canopy N detection.

Remote sensing of canopy nitrogen at regional scale in Mediterranean forests using the spaceborne MERIS Terrestrial Chlorophyll Index