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Fig. 4 | Forest Ecosystems

Fig. 4

From: Tropical forest canopies and their relationships with climate and disturbance: results from a global dataset of consistent field-based measurements

Fig. 4

Variations in field-derived forest LAI for stands located along gradients of long-term droughts. The graph shows the field derived estimates, aggregated at 1 km pixel resolution depending on protection status. We used linear mixed effect models to predict canopy attributes as a function of MWD, Protection and their interaction, with continent as a random effect [e.g. LAI ~ MWD*Protection + (1 + MWD|Continent)]. Canopy attributes decreased with MWD, with the slope of this effect being steeper for Australasia versus Africa and Asia and a reversed link for the Americas. The intercept of this effect was higher for the Americas compared to Africa and Australasia. We used the r.squaredGLMM function as a simplified approach to calculate model fits. The marginal R2 of MWD on LAI was 15%, on FCover 28%, and on fAPAR 28%. This increased to 76% (LAI) and 64% (for both FCover and fAPAR) for the conditional R2. Model fits and their 95% confidence intervals were computed using the function predictInterval specifying 1000 simulations for each observation, setting the point estimate to the mean of the simulated values and incorporating the residual variance from the model into the predictions

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