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| Effects of arbuscular mycorrhizal fungi on Cd leaching loss in contaminated soil and its preliminary mechanism |
| Received:December 08, 2021 |
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| KeyWord:arbuscular mycorrhizal fungi (AMF);glomalin related soil protein;interflow;Cd leaching;soil aggregate composition |
| Author Name | Affiliation | E-mail | | ZHANG Jinxiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
Kunming Institute of Ecological and Environmental Sciences, Kunming 650032, China | | | SU Lin | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | JIANG Ming | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Mingrui | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Can | Kunming Geological Exploration Institute of China Metallurgical Geology Bureau, Kunming 650203, China | | | HE Yongmei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Jianjun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fangdong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zfd97@ynau.edu.cn |
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| Abstract: |
| The effects of arbuscular mycorrhizal fungi(AMF)on growth and cadmium(Cd)uptake in maize, soil aggregate composition, Cd concentration in interflows, and leaching loss were investigated. Cd-polluted soils were sampled from farmland around a lead-zinc mine in Lanping County, Yunnan Province. Maize(Zea mays L.)with or without AMF inoculation was planted indoors in pots. The results showed that the AMF inoculation significantly increased the maize biomass and decreased maize ' s Cd content and uptake. AMF significantly increased contents of total glomalin-related soil protein(T-GRSP)and easily extracted glomalin-related soil protein(EE-GRSP)in the 0~40 cm soil layers. Furthermore, AMF increased the content of soil aggregates with a size(R)>0.25 mm by 55% and decreased the content of soil aggregates(R<0.25 mm)as well as the available Cd content by 26%~43%. Moreover, AMF significantly reduced the Cd concentration in the interflow in the 0~30 cm soil layer by 14%~22% and caused a decrease of 29% in Cd leaching from the polluted soil. Correlation analysis indicated that the content of soil aggregates(R>0.85 mm)was positively correlated with the T-GRSP content, and the aggregate content(R>0.25 mm)presented a very significant negative correlation with the Cd concentration in the interflow and Cd leaching from the soil. There was a very significant and significant positive correlation between the available Cd content and Cd concentration in the interflow and Cd leaching loss from the soil, respectively. AMF increased the content of macroaggregates(R>0.25 mm)and glomalin related soil protein in soil, which contributed to reducing the available Cd content in soil and the Cd concentration in the interflow thereby decreasing Cd leaching from polluted soil. Therefore, AMF has an important impact on the effects of soil Cd leaching and loss. |
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