Corn cob biochar increases soil culturable bacterial abundance without enhancing their capacities in utilizing carbon sources in Biolog Eco-plates

文献类型: 外文期刊

第一作者: Jiang Lin-lin

作者: Jiang Lin-lin;Lan Yu;Liu Sai-nan;Yang Xu;Meng Jun;Chen Wen-fu;Jiang Lin-lin;Gao Ji-ping;Chen Wen-fu;Han Guang-ming

作者机构: Shenyang Agr Univ, Liaoning Biochar Engn & Technol Res Ctr, Shenyang 110866, Peoples R China;Shenyang Agr Univ, Rice Res Inst, Shenyang 110866, Peoples R China;Hubei Acad Agr Sci, Ind Crops Inst, Wuhan 430064, Peoples R China

关键词: biochar;soil microbial community;DGGE;Biolog Eco-plates

期刊名称:JOURNAL OF INTEGRATIVE AGRICULTURE ( 2020影响因子:2.848; 五年影响因子:2.979 )

ISSN: 2095-3119

年卷期: 2017 年 16 卷 3 期

页码:

收录情况: SCI

摘要: Biochar has been shown to influence soil microbial communities in terms of their abundance and diversity. However, the relationship among microbial abundance, structure and C metabolic traits is not well studied under biochar application. Here it was hypothesized that the addition of biochar with intrinsic properties (i.e., porous structure) could affect the proliferation of culturable microbes and the genetic structure of soil bacterial communities. In the meantime, the presence of available organic carbon in biochar may influence the C utilization capacities of microbial community in Biolog Eco-plates. A pot experiment was conducted with differenct biochar application (BC) rates: control (0 t ha(-1)), BC1 (20 t ha(-1)) and BC2 (40 t ha(-1))(.) Culturable microorganisms were enumerated via the plate counting method. Bacterial diversity was examined using denaturing gradient gel electrophotesis (DGGE). Microbial capacity in using C sources was assessed using Biolog Eco-plates. The addition of biochar stimulated the growth of actinomyces and bacteria, especially the ammonifying bacteria and azotobacteria, but had no significant effect on fungi proliferation. The phylogenetic distribution of the operational taxonomic units could be divided into the following groups with the biochar addition: Firmicutes, Acidobacteria, Gemmatimonadetes, Actinobacteria, Cyanobacteria and alpha-, beta-, gamma- and delta-Proteobacteria (average similarity > 95%). Biochar application had a higher capacity utilization for L-asparagine, Tween 80, D-mannitol, L-serine, gamma-hydroxybutyric acid, N-acetyl-D-glucosamine, glycogen, itaconic acid, glycyl-L-glutamic acid, alpha-ketobutyricacid and putrescine, whereas it had received decreased capacities in using the other 20 carbon sources in Biolog Eco-plates. Redundancy analysis (RDA) revealed that the physico-chemical properties, indices of bacterial diversity, and C metabolic traits were positively correlated with the appearance of novel sequences under BC2 treatment. Our study indicates that the addition of biochar can increase culturable microbial abundance and shift bacterial genetic structure without enhancing their capacities in utilizing C sources in Biolog Eco-plates, which could be associated with the porous structure and nutrients from biochar.

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