Table 6. Evaluation metrics of ensemble model (EML) and each sub-model based on five-fold spatial CV.

Model	R2	CCC	RMSE	MAE	Bias
EML	0.89	0.94	0.10	0.06	−0.0008
Extremely randomized trees	0.88	0.94	0.10	0.07	0.0002
Gradient descended trees	0.88	0.94	0.10	0.07	0.001
Artificial neural network	0.87	0.93	0.11	0.07	0.0001