Growth and response characteristics of Sorghum-sudan grass under combined low stress of copper-cadmium-phenanthrene
To study the growth and response characteristics of Sorghum-sudan grass under low concentrations of combined heavy metal-polycyclic aromatic hydrocarbon pollution,the germination rate changes,biomass,accumulation of copper,cadmium and phenanthrene degradation and chlorophyll composition were detected by field experiments.The results showed that the combined stress of 10 mg·kg-1 phenanthrene and 100 mg·kg-1 copper could promote Sorghum-sudan grass growth,increasing the sum of the stem and leaf biomass and the root biomass by 14.7%and 8.1%,respectively.However,cadmium(5 mg·kg-1)inhibited the grass growth.Copper and cadmium accumulated in the roots,and the combined stress of phenanthrene and copper promoted copper migration and increased the phenanthrene removal rate by 40.6%but hindered cadmium migration.Meanwhile,low concentrations of copper and phenanthrene could stimulate the synthesis of chlorophyll a,while the combined stress of copper and cadmium resulted in a chlorophyll b content decrease.Correlation analysis further confirmed the strong correlation between Sorghum-sudan grass growth,pollutant migration,and chlorophyll synthesis.Consequently,Sorghum-sudan grass could grow under a low combined stress of copper-cadmium-phenanthrene and respond to the stress through heavy metal migration,organic metabolism,and changes in chlorophyll content.
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