Figure 3 Graphic Model of Environmental Factor vs. Vegetation Distribution vs. Net Primary Productivity (Based on Ohta et al., 1993)

TR： Tropical/Subtropical rain forests, MF： Monsoon forests, S： Savanna, EB： Evergreen broad-leaved forest, DB： Deciduous broad-leaved forest, DB + EF： Mixed forests of broadleaf trees and needle-leaf trees, CF： Coniferous forest, G₁： Warm-temperature zone steppe, G₂： Cool-temperate zone steppe, T： Tundra, D： Semi-desert to desert, I and II： Ceiling and floor values of annual net radiation per climatic zone.

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