Fig. 4. Content and stoichiometric characteristics of organic
carbon, total nitrogen, and total phosphorus in plant root and
aboveground fractions and rhizosphere soils for different plant species.
Error bars refer to standard deviation; respectively. Different
lowercase letters indicate significant differences among different plant
species (p<0.05). Fe, Festuca elata ; Ed, Elymus
dahuricus ; Ms, Medicago sativa ; Fe+Ed, Festuca elata plus
Elymus dahuricus ; Fe+Ms, Festuca elata plus Medicago sativa ;
Ms+Ed, Medicago sativa plus Elymus dahuricus ;Fe+Ms+Ed,Festuca elata plus Medicago sativa plus Elymus dahuricus .