Figure 4. Site scale correlations between litter disappearance (Litter Dis.), aboveground biomass (AG Biomass), and physical variables (elevation and mean annual precipitation (MAP)) within three U.S. regions, Intermountain West, Pacific Coast, and Great Plains.

Significant relationships are depicted by correlation lines; Intermountain West litter disappearance and precipitation (p = 0.02, r² = 0.74), Great Plains aboveground biomass and elevation (p = 0.03, r² = 0.44) and Great Plains aboveground biomass and mean annual precipitation (p<0.001, r² = 0.84).