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Stepwise multiple regression (backward with AIC criteria for model comparisons) retained soil P, K, pH, and percentage sand as predictors of diversity loss from the addition of three resources, for the 30 sites with soil analysis data (excluding one site for extreme value of P). The variables latitude, longitude, mean annual precipitation, and soil percentage N were not retained. Overall model is significant (r2 = 0.375, F4,25 = 3.75, P = 0.016).