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| Resistance and remediation potential of Ficus microcarpa to Pb and Cd pollution in soil |
| Received:March 01, 2021 |
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| KeyWord:Pb;Cd;heavy metal pollution;Ficus microcarpa;phytoremediation |
| Author Name | Affiliation | E-mail | | PENG Weixin | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | | | ZHUANG Yuting | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | | | LIANG Zhiqi | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | | | YU Zhengnan | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | | | WU Daoming | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | | | ZHANG Xueping | Foshan Forestry Science Research Institute, Foshan 528222, China | | | ZENG Shucai | College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China | sczeng@scau.edu.cn |
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| Abstract: |
| This study determined the adaptability of Ficus microcarpa to Pb and Cd polluted soil using a pot experiment. The entropy weight TOPSIS model was used to comprehensively evaluate the remediation potential of Pb and Cd polluted soil. The results showed that the growth of F. microcarpa was promoted in soils with low Pb content, whereas it was inhibited in soils with high Pb content. Compared with the control(CK1), the underground and total biomass of F. microcarpa under the 500 mg·kg-1 Pb treatment was increased by 28.92% and 30.09%, respectively, and the uptake of nitrogen, phosphorus, and potassium was increased by 11.74%, 97.59%, and 61.80%, respectively. The 1 500 mg·kg-1 Pb treatment exhibited a significant inhibitory effect on the growth and development of the plants. The low Cd treatment (10 mg·kg-1) had no significant effect on biomass and the uptake of nitrogen and potassium of F. microcarpa, whereas plant growth was inhibited under the ≥ 25 mg·kg-1 Cd treatment. Ficus microcarpa was sensitive to Cd, but exhibited good tolerance to Pb in Pb and Cd polluted soil. Compared with the Pb1000Cd25 treatment, increasing Pb content(Pb1500Cd25) or Cd content(Pb1000Cd50) in the soil significantly increased the content of heavy metals in the roots of F. microcarpa. Compared with the Pb1500Cd25 treatment, increasing the content of Cd in soil(Pb1500Cd50) inhibited the absorption of Pb in F. microcarpa roots, but promoted the absorption of Pb in the aboveground parts of the plants. An analysis using the entropy weight TOPSIS model indicated that the comprehensive evaluation coefficients of growth and nutrient uptake of F. microcarpa under single Pb or Cd polluted soil were as follows:Pb500 > Cd10 > CK1 > Pb1000 > Cd25 > Pb1500 > Cd50, indicating that F. microcarpa exhibited the best adaptability when the Pb content of soil was 500 mg·kg-1. The comprehensive evaluation coefficients of heavy metal absorption capacity of F. microcarpa under Pb and Cd polluted soil were as follows:Pb1500Cd50 > Pb1500Cd25 > Pb1000Cd25 > Pb1000Cd50 > CK2, but the growth and nutrient absorption of the plants were inhibited under the Pb1500Cd50 and Pb1500Cd25 treatments. Therefore, F. microcarpa can be used to remediate polluted soil with Pb and Cd contents less than 1 000 mg·kg-1 and 25 mg·kg-1, respectively. |
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