Structural changes of soil organic matter and the linkage to rhizosphere bacterial communities with biochar amendment in manure fertilized soils

• DOI: 10.1016/j.scitotenv.2019.07.262
• Publication Date: 2019-07-17T23:45:01Z
• Authors: Ruilin Huang; Zhenyi Zhang; Xian Xiao; Na Zhang; Xiaoyue Wang; Zeping Yang; Kaiqin Xu; Yuting Liang
• Keywords: China; Bacteria; Microbiota; 04 agricultural and veterinary sciences; 15. Life on land; Bacterial Physiological Phenomena; Manure; Soil; Charcoal; Rhizosphere; 0401 agriculture, forestry, and fisheries; Organic Chemicals; Fertilizers

The molecular structure of soil organic matter (SOM) is closely related to the structure and functions of the rhizosphere community. In this study, a microcosm experiment was conducted to investigate the effect of straw-derived biochar on the structural differentiation of SOM and rhizosphere bacterial communities. 13C NMR spectra showed that the relative abundance of carboxyl, alkyl, N-alkyl, O-alkyl and methoxyl groups decreased by 22%, 31%, 27%, 27% and 27%, respectively, and the relatively stable structure of aryl and O-aryl groups increased by 213% and 41%, respectively. In addition, network-based analysis showed that biochar amendment not only improved the network connectivity of the rhizosphere bacteria, but also enhanced the linkage between bacteria and the molecular structure of SOM. The topological properties of the network, including the number of edges, network density, and average clustering coefficient, were increased by 79%, 15% and 22%, respectively. Moreover, modularization analysis and structural equation model indicated that rhizosphere bacterial network was the important bio-factor affecting the content of labile carbon.