Fig. 2

Study area and the accuracy of carbon-water flux simulation models (random forest model, RFM). (a) Distribution of the 156 Eurasian flux stations covering five main landscape types. (b) The accuracy assessments of the RFM based on the Eurasian flux stations in the framework of the 10-time 10-fold cross-validation. The figure shows the percentage of the RFMs with R2 ≥ 0.5 tested in the test sets for nine categories.