title: Biochar impacts soil microbial community composition and nitrogen cycling in an acidic soil planted with rape.
abstract: Biochar has been suggested to improve acidic soils and to mitigate greenhouse gas emissions. However, little has been done on the role of biochar in ameliorating acidified soils induced by overuse of nitrogen fertilizers. In this study, we designed a pot trial with an acidic soil (pH 4.48) in a greenhouse to study the interconnections between microbial community, soil chemical property changes, and N2O emissions after biochar application. The results showed that biochar increased plant growth, soil pH, total carbon, total nitrogen, C/N ratio, and soil cation exchange capacity. The results of high-throughput sequencing showed that biochar application increased α-diversity significantly and changed the relative abundances of some microbes that are related with carbon and nitrogen cycling at the family level. Biochar amendment stimulated both nitrification and denitrification processes, while reducing N2O emissions overall. Results of redundancy analysis indicated biochar could shift the soil microbial community by changing soil chemical properties, which modulate N-cycling processes and soil N2O emissions. The significantly increased nosZ transcription suggests that biochar decreased soil N2O emissions by enhancing its further reduction to N2.
authors: Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen 361021, People's Republic of China.
authors: Hui-Juan
authors: HJ
authors: Xu
authors: Xiao-Hui
authors: XH
authors: Wang
authors: Hu
authors: H
authors: Li
authors: Huai-Ying
authors: HY
authors: Yao
authors: Jian-Qiang
authors: JQ
authors: Su
authors: Yong-Guan
authors: YG
authors: Zhu
mesh_terms: D018533:Biomass; D001937:Brassica / Q000254:growth & development*; D002606:Charcoal / Q000737:chemistry* / Q000494:pharmacology; D058440:Denitrification; D005308:Fertilizers / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D064307:Microbiota / Q000187:drug effects / Q000235:genetics; D058465:Nitrification; D058458:Nitrogen Cycle; D009609:Nitrous Oxide / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology / Q000592:standards
chemical_list: D005308:Fertilizers; D012987:Soil; C540010:biochar; D002606:Charcoal; D009609:Nitrous Oxide