Figure captions
Fig 1 . The changes of total, shoot, root biomass and their
ratio with gravel content for different plant species. Error bars refer
to standard deviation. Different lowercase letters indicate significant
differences among different gravel soils; different capital letters
indicate significant differences among all treatments
(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 .
Fig. 2 The changes of plant height and coverage with gravel
content for different plant species. (a), Total coverage; (b), Plant
height; (c), Coverage of different plant species; (d), Height of
different plant species. Error bars refer to standard deviation.
Different lowercase letters indicate significant differences among
different gravel soils (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 .
Fig. 3 Content and stoichiometric characteristics of organic
carbon, total nitrogen, and total phosphorus in plant root and shoot
fractions and rhizosphere soils with different gravel contents. Error
bars refer to standard deviation Different lowercase letters indicate
significant differences among different gravel soils (p<0.05).
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 .
Fig. 5 RDA of the relationships among plant traits, soil
properties, and their stoichiometric characteristics for different plant
species. TN, soil total nitrogen; TP, soil total phosphorus; SOC, soil
organic carbon;S-C/N, soil C/N ratio; S-C/P, soil C/P ratio; S-N/P, soil
N/P ratio; PH, soil pH; BD, bulk density; e , total porosity; PTN,
plant total nitrogen; PTP, plant total phosphorus; POC, plant organic
carbon; P-C/N, plant C/N ratio; P-C/P, plant C/P ratio; P-N/P, plant N/P
ratio; RTN, root total nitrogen; RTP, root total phosphorus; ROC, root
organic carbon; R-C/N, root C/N ratio; R-C/P, root C/P ratio; R-N/P,
root N/P ratio; H, Plant height; Tc, total coverage; Ab, aboveground
biomass; Rb, root biomass; B, total biomass.
Fig 1 . The changes of total, shoot, root biomass and their
ratio with gravel content for different plant species. Error bars refer
to standard deviation. Different lowercase letters indicate significant
differences among different gravel soils; different capital letters
indicate significant differences among all treatments
(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 .