title: Temporal Changes Rather than Long-Term Repeated Burning Predominately Control the Shift in the Abundance of Soil Denitrifying Community in an Australian Sclerophyll Forest.
abstract: To understand the temporal dynamics of soil bacterial denitrifying community in response to long-term prescribed burning and its resilience and recovery following a fire, a wet sclerophyll forest study site under two treatments (2 yearly burning (2YB) and no burning (NB)) and with 40-year-old burning history was used. Similar temporal patterns in the abundance of total (16S rRNA) and denitrifying (narG, nirK, nirS, nosZ) bacteria between two burning treatments revealed strong temporal influences. The magnitude of burning impacts on the abundance of 16S rRNA and denitrification genes was smaller compared with the impact of sampling time, but significant burning and temporal impacts were recorded for all (P < 0.001)-except for the nirS gene. Impacts of prescribed fire on the abundance of soil denitrifying community could be observed immediately after fire, and this impact diminished over a 24-month period prior to the next prescribed burning event. In conclusion, temporal changes govern the fluctuations of the abundance of soil denitrifying genes over the sampling period and the denitrifying community can recover after fire, suggesting that this community is resilient to the effects of prescribed burning. A combination of biotic and abiotic factors may account for the different temporal dynamics of denitrification gene abundance.
authors.affiliation: College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, 350002, China. xianliu@fafu.edu.cn.|Australian Rivers Institute, School of Environment, Griffith University, Nathan, QLD, 4111, Australia. xianliu@fafu.edu.cn.
authors.forename: Xian
authors.identifier: http://orcid.org/0000-0002-2686-593X
authors.initials: X
authors.lastname: Liu
authors.affiliation: Australian Rivers Institute, School of Environment, Griffith University, Nathan, QLD, 4111, Australia.
authors.forename: C R
authors.initials: CR
authors.lastname: Chen
authors.affiliation: Australian Rivers Institute, School of Environment, Griffith University, Nathan, QLD, 4111, Australia.
authors.forename: J M
authors.initials: JM
authors.lastname: Hughes
authors.affiliation: Department of Science, Information Technology, Innovation and the Arts, Nathan, QLD, 4102, Australia.
authors.forename: W J
authors.initials: WJ
authors.lastname: Wang
authors.affiliation: Horticulture and Forestry Science Agri-Science, DAFF (Department of Agriculture, Fishery and Forestry), Nathan, QLD, 4558, Australia.
authors.forename: Tom
authors.initials: T
authors.lastname: Lewis
mesh_terms: D001315:Australia; D001419:Bacteria / Q000145:classification* / Q000235:genetics / Q000378:metabolism*; D058440:Denitrification; D005390:Fires; D065928:Forests; D050898:Nitrite Reductase (NAD(P)H) / Q000235:genetics; D010088:Oxidoreductases / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D011891:Rain; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014197:Trees / Q000382:microbiology*
chemical_list: D012336:RNA, Ribosomal, 16S; D012987:Soil; D010088:Oxidoreductases; D050898:Nitrite Reductase (NAD(P)H); C022763:nitrous oxide reductase
keywords: Bacterial denitrifying community; Functional genes; Prescribed burning; Recovery and resilience; Temporal changes; qPCR