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| Effects of exogenous cadmium on microbial biomass and enzyme activity in red paddy soil |
| Received:March 15, 2018 |
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| KeyWord:red soil;cadmium pollution;soil microbial biomass;soil enzyme activity |
| Author Name | Affiliation | E-mail | | GUO Bi-lin | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Xiao-min | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | xmchen@njau.edu.cn | | JING Feng | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHANG Xiao-ling | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | YANG Zhi-jiang | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | LIU Wei | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | | | LIU Wen-xin | College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China | |
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| Abstract: |
| This study was carried out to investigate the effects of exogenous Cd on the microbial index in red paddy soil in Hunan Province. An indoor simulation experiment was conducted to study the effects of exogenous cadmium amendment (0, 1, 3, 5, 7, and 10 mg·kg-1) on soil microbial biomass and enzyme activity. The results showed that soil microbial biomass C and N increased at first and later decreased with the addition of exogenous Cd. The highest concentrations of soil microbial biomass C and N were measured when the concentration of exogenous cadmium was 1 mg·kg-1. Soil dehydrogenase, catalase, and urease activities decreased with increasing exogenous Cd concentrations, whereas soil invertase activity decreased firstly, then increased, and finally decreased. Path analysis indicated that the addition of exogenous Cd could affect the soil microbial biomass and enzyme activities directly or indirectly. The exogenous Cd concentration had the maximum direct path coefficient (-1.110) with microbial biomass carbon, and the maximum correlation coefficient (-0.952**) was found between exogenous Cd concentration and dehydrogenase activity. These results suggested that exogenous Cd addition could restrain the soil microbial biomass and enzyme activities, and soil dehydrogenase activity might be the most sensitive index to exogenous Cd addition. |
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