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| Community characteristics of denitrifiers from rhizosphere and bulk soil of plants in the Siding mine area,China |
| Received:February 06, 2023 |
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| KeyWord:mine area;denitrifier;nirS gene abundance;nirK gene abundance;community structure |
| Author Name | Affiliation | E-mail | | YU Fangming | Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University), Ministry of Education, Guilin 541004, China
College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | LIN Qiujuan | College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | WEI Jiayu | College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | LI Songying | College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | TANG Chijian | College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | TANG Shuting | College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | | | LI Yi | Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University), Ministry of Education, Guilin 541004, China
College of Environment and Resources, Guangxi Normal University, Guilin 541004, China | liyi412@mailbox.gxnu.edu.cn |
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| Abstract: |
| The effects of plant species and soil properties on soil denitrification was explored in three areas of the Siding lead-zinc mining region. The microbial diversity and community compositions of nirK-type and nirS-type denitrifiers in rhizosphere and bulk soils from three dominant plant species (Pteris vittata L., Phragmites australis, and Miscanthus floridulus) were analyzed. Rhodanobacter (nirS) and Bradyrhizobium (nirK) dominated the soil denitrifier communities, with abundances ranging from 2.6% to 67.8% and from 4.1% to 38.1%, respectively. The nirS and nirK gene abundances in the mine tailing area ranged from 1.45×106 to 7.78×106 gene copies·g-1 (calculated by dry weight) and from 1.10×106 to 5.70×106 gene copies·g-1, respectively, which were significantly lower than the corresponding values in the upstream and downstream areas (P<0.05). The Shannon and ACE index values from the rhizosphere samples of the three dominant plant species were higher than the index values recorded from the bulk soil samples. Multiple linear regression analysis and the Mantel test showed that soil moisture content, total carbon, total nitrogen and total phosphorus were key factors that strongly influenced the soil denitrifier community. The results indicate that plant species and soil properties impact the soil denitrification process in mine areas and also affect the abundance, composition, and diversity of the denitrifier community. |
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