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| Effects of arbuscular mycorrhizal fungi on leaching of dissolved and colloidal Cd |
| Received:February 20, 2020 |
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| KeyWord:arbuscular mycorrhizal fungi;glomalin-related soil protein;specific surface area;cadmium adsorption;leaching loss |
| Author Name | Affiliation | E-mail | | SU Lin | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CAO Li | Kunming Geological Exploration Institute of China Metallurgical Geology Bureau, Kunming 650203, China | | | ZHANG Jin-xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | QIN Li | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn |
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| Abstract: |
| In the present study, a sand column at a height of 30 cm was made by quartz sand with a diameter of 0.2 mm. Maize(Zea mays L.)was cultivated with or without an inoculation of arbuscular mycorrhizal fungi(AMF). Dissolved and colloidal Cd of 1 mg·L-1 were added into the sand column. Then, sand column cultivation and leaching experiments were carried out to investigate the effects of AMF on the specific surface area of the quartz sand, Cd concentration in the sand column solution, and Cd leaching loss. The results showed that:AMF mycelium grown in the sand column and secreted glomalin-related soil protein(GRSP)increased the specific surface area of quartz sand and promoted the sorption amount and adsorption capacity of the quartz sand for Cd; the inoculated AMF significantly reduced the concentration of dissolved and colloidal Cd in the solution at a depth of 10 cm in the sand column and reduced the Cd leaching loss; and the correlation analysis indicated that the GRSP content in the sand column had a significant positive correlation with the Cd adsorption amount of the quartz sand but was negatively correlated with the Cd concentration of solutions in the sand column for the AMF inoculation treatment. Furthermore, the Cd adsorption amount of the quartz sand had a significant negative correlation with the Cd concentration of solutions in the sand column. The Cd adsorption amount of the quartz sand at a 20 cm depth was significantly negatively correlated, while the Cd concentration of the solution at a 30 cm depth was significantly positively correlated with the Cd leaching loss from the sand column. Thus, the AMF mycelium secreted GRSP increase the specific surface area of the quartz sand and its Cd adsorption and thereby, reduce the Cd concentration and leaching loss from the sand column. |
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