gcb12002-sup-0001-FiguresS1-S3.docxWord document64K Figure S1. Histogram of occurrence of the 482 forest herb species used for calibrating a WA-PLS model. Figures above bars represent the number of species by occurrence class. Figure S2. R2 (between predicted and measured pH, open circles) and RMSE (closed circles) variation according to the number of species per plot used to predict pH values from species assemblages. Values were computed by an iterative sampling approach using the 16 × 16 Network dataset to define the minimal number of species per plot to calibrate the WA-PLS model. Arrows indicate the number of species per plot selected in function of the computed R2 and RMSE. Figure S3. Variogram for the ‘reference’ floristic plots in (a) acidic and (b) nonacidic French forest areas. The solid blue line describes a fitted spherical model. The threshold of distance selected because pH values within this radius were spatially autocorrelated is indicated by arrows (i.e., 5 km).

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