Understanding Experimental warming and grazing SPD A B) 50 50 40 35 30 20 20 95 10.0 10.5 11.0 11.5 12.0 0 20 30 40 50 60 70 air temperature(C) litter areal coverage (% A)Relationship between total SR and growing season averaged air temperature B)Relationship between total SR and growing season averaged litter cover. Experimental warming caused decrease in species richness (KLEIN,HARDE,ZHAO,2004,Ecology Letters). litter areal coverage (%) 0 10 20 30 40 50 60 70 20 25 30 35 40 45 50 55 air temperature (o C) 9.5 10.0 10.5 11.0 11.5 12.0 average # species / plot 20 25 30 35 40 45 50 55 A) B) Experimental warming and grazing SPD Experimental warming caused decrease in species richness A) Relationship between total SR and growing season averaged air temperature B) Relationship between total SR and growing season averaged % litter cover. (KLEIN,HARDE,ZHAO,2004,Ecology Letters). Understanding