Biomass productivity data – NDVI
The Normalized Difference Vegetation Index – NDVI is a spectral
indicator widely used to quantify photosynthetic activity, which is a
proxy for biomass production, an indicator of ecosystem functioning
(Pettorelli et al. 2005; De Keersmaecker et al. 2017).
Here, we employed NDVI data at the 250 m resolution for the period of
2000 to 2018, with 23 acquisitions per year for each one of the 108
plots. The original data were obtained from the MODIS product MOD13Q
(Didan 2015), available through the Google Earth Engine (Google Earth
Engine Team 2015). NDVI values were subjected to a smoothing process
(Savitzky & Golay 1964) using the function savgol of pracma
package (Borchers 2021).