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| Effects of Cadmium Tolerant Bacteria on Soil Cadmium Forms and Microbial Community Structure |
| Received:April 07, 2015 |
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| KeyWord:soil;cadmium fractionation;cadmium tolerant bacteria;phospholipid fatty acid(PLFA);microbial community structure |
| Author Name | Affiliation | E-mail | | WANG Jing-wen | Plant Protection and Soil-Fertilizer Station of Hangzhou City, Hangzhou 310020, China | | | LI Dan | Plant Protection and Soil-Fertilizer Station of Hangzhou City, Hangzhou 310020, China | | | LIU Jun | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | HOU Chang-ping | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | | | ZHANG Qi-chun | College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China | qczhang@zju.edu.cn |
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| Abstract: |
| Soil pollution with heavy metals is one of the most severe environmental and human health problems. Microbial remediation of heavy metal polluted soils has received increasing interests. Here a cadmium-resistant bacterial strain m6 that could activate cadmium was isolated from heavy metal-polluted soils in Fuyang City, Zhejiang Province, and was identified as Arthrobacter by 16S rDNA gene sequence analysis. Then, the effects of the isolated strain on heavy metal solubilization and soil microbial community structure were investigated in a pot experiment. Soil cadmium fractions were also evaluated using modified Tessier sequential extraction method. Inoculation of the isolate m6 increased the concentration of soluble cadmium by 43.47% and soil exchangeable cadmium by 16%, indicating the ability of the strain to solublize cadmium. After inoculation with the strain, the average well color development(AWCD) values of soil were increased by 14%~146% and the utilization of sugar and derivatives, amines, and polymer were also enhanced. Inoculation of cadmium-tolerant bacterial isolates increased total phospholipid fatty acid(PLFA) by 23.56%, and enhanced the fungal signature PLFAs(18:2ω6, 9、16:1ω5c、and 18:1ω9c) significantly, but reduced the actinomycete PLFAs(l0Me 16:0、l0Me 17:0 and 10Me 18:0) significantly, and decreased G-/G+ ratio by 38.6%. |
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