Effects of carbon-enrich silicon fertilizer on the community characteristics of iron-reducing bacteria in paddy fields
LIN Mei-fen1, ZHENG Yi1, WANG Xiao-tong1, XU Xu-ping1, WANG Wei-qi2,3
1. College of Life Science, Fujian Normal University, Fuzhou 350117, China; 2. Institute of Geography, Fujian Normal University, Fuzhou 350007, China; 3. Key Laboratory of Humid Sub-tropical Eco-geographical Process of Ministry of Education, Fujian Normal University, Fuzhou 350007, China
Abstract：In order to explore the relative abundance, diversity and community structure of iron-reducing bacteria (FeRB) in paddy fields of Fuzhou Plain, by setting up the control group and the treatment groups with three dosage levels (300, 600 and 900kg/hm2) of carbon-enrich silicon fertilizer (CESF). The results showed that the application of CESF facilitated the growth and reproduction of FeRB, among which 600kg/hm2 treatment had the most significant impact on the growth of FeRB (P<0.05). According to the Shannon index, the diversity of FeRB was decreased by the three treatment groups during the jointing stage of late rice. The diversity index of the 300kg/hm2 treatment group decreased most significantly, which was 29.4% lower than the control group. In the jointing stage of early and late rice, a total of 5 phyla have been identified in the soils. The total proportion of Proteobacteria, Bacteroidetes and Firmicutes was over 95% on average, and they were the dominant bacteria phyla in paddy fields. After application of CESF, the relative abundance of Bacteroides in the soil at early rice jointing stage was significantly increased (P<0.05), while that of Anaeromyxobacter was decreased. In addition, environmental factors were correlated with relative abundance of FeRB in the soils. The relative abundance of Desulfovibrio was significantly and positively correlated with soil pH (P<0.05). The relative abundance of Anaeromyxobacter was significantly and positively correlated with soil temperature (P<0.05). The above studies concluded that diversity and community structure of FeRB were significantly affected by CESF in paddy fields.
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LIN Mei-fen, ZHENG Yi, WANG Xiao-tong, XU Xu-ping, WANG Wei-qi. Effects of carbon-enrich silicon fertilizer on the community characteristics of iron-reducing bacteria in paddy fields. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1778-1789.
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