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absence of limestone annual precipitation APR I IAPR APR-effect Arizona data asymptote Clary climax cover climax overstory CROWN COVER PERCENT data points data set duction ecosystems effect appeared Experiment Station FLORL Forest and Range grassland HEIGHT YPAPR herbage production potential herbage production value hypothesized Idaho IDOKTR independent variables INFLECTION POINTS IPCOV I COV Jensen and Homeyer Juniper Areas kg/ha lb/acre limestone soils limited APR-range lntermountain mathematical model model R2 Montana in cooperation N03 levels Nevada nitrate-nitrogen nitrification NL NL NL NON-LIME Nonlimestone north-central Arizona Paper INT-279 July pinyon-juniper areas potential herbage production Potential on Pinyon presence or absence PRNT program for table rescaling refit Research Paper INT-279 SCALING HEIGHT sigmoidal forms SIGMOIDS OVER COVER soil parent material sy_x table output tree cover Utah in cooperation XCOV xeric YPCL YPCNL ZOOKTR