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Predicted and observed effects of combined global change treatments on forbs (F), annual grasses (A), perennial grasses (P), and total diversity (D). Predicted values are the summed effects of individual global change factors that make up each selected treatment combination. Points on the 1:1 line indicate perfectly additive (no interaction) responses to combined global change treatments. T, elevated temperature; C, elevated CO2; P, elevated precipitation; N, nitrogen deposition.
