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| Growth and response characteristics of Sorghum-sudan grass under combined low stress of coppercadmium-phenanthrene |
| Received:December 01, 2023 |
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| KeyWord:Sorghum-sudan grass;phenanthrene;copper;cadmium;chlorophyll |
| Author Name | Affiliation | E-mail | | SU Saisai | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | | | DUAN Yanqing | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | dduanyanqing@tit.edu.cn | | YANG Xiaohan | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | | | GAO Qianwei | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | | | CHEN Yuming | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | | | XIANG Jie | Department of Environmental and Safety Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China | |
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| Abstract: |
| To study the growth and response characteristics of Sorghum-sudan grass under low concentrations of combined heavy metalpolycyclic 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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