We also included climate variables to control for potential confounding effects (i.e., the first three axes of a factor analysis with climate variables, see Supplementary Table S11 ), and predictors referring to trends: we included ΔGPP, ΔRe or ΔNEP (matching the response variable), the mean annual sums of the C flux (GPP, Re or NEP, again matching the response variable), trends in weather variables (ΔTemperature, ΔPrecipitation, ΔWind speed and ΔVPD), an overall trend of weather temporal complexity (an average of ΔTemperature CD , ΔPrecipitation CD , ΔWind speed CD and ΔVPD CD ), Shannon’s diversity, stand biomass, green biomass (EVI), total N deposition, and the site-specific trend in flux data quality.
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Temporal complexity of terrestrial ecosystem functioning and its drivers.
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The sentences
We report a positive trend in GPP complexity over time, which correlates with increasing GPP.