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dc.contributor.authorReverchon, Frederique
dc.contributor.authorAbdullah, Kadum M
dc.contributor.authorBai, Shahla Hosseini
dc.contributor.authorVillafan, Emanuel
dc.contributor.authorBlumfield, Timothy J
dc.contributor.authorPatel, Bharat
dc.contributor.authorXu, Zhihong
dc.date.accessioned2020-01-24T00:53:14Z
dc.date.available2020-01-24T00:53:14Z
dc.date.issued2020
dc.identifier.issn1439-0108
dc.identifier.doi10.1007/s11368-019-02446-9
dc.identifier.urihttp://hdl.handle.net/10072/390843
dc.description.abstractPurpose: Prescribed burning is a forest management practice which can lead to nitrogen (N)-limited conditions. This study aimed to explore whether biological N2 fixation (BNF) remained the main source of N acquisition for two understorey Acacia species in a Eucalyptus-dominated suburban forest of subtropical Australia, 3 to 6 years after prescribed burning. Root-nodule bacteria associated with these acacias were also characterised to unravel the differences in rhizobial communities between sites and species. Material and methods: Two sites, burned 3 and 6 years before sample collection, were selected within a dry subtropical forest of south-east Queensland, Australia. Leaves were collected from individuals of Acacia disparrima and A. leiocalyx at each site to determine leaf total carbon (C) and N content, C and N isotope composition (δ13C and δ15N) and the percentage of N derived from atmospheric N2. Nodules were harvested from both acacia species at each site to isolate root nodule bacteria. Bacterial isolates were processed for 16S rDNA gene sequencing. Results and discussion: Generally, no differences were found in plant physiological variables between the two acacia species. Six years after the fire, both species still depended upon BNF for their N supply, with a higher dependence in winter than in summer. Fire, although of low intensity, was likely to have created a N-limited environment which induced the reliance of legumes on BNF. Root nodule bacteria were dominated by non-rhizobial endophytes, mainly from the Firmicutes phylum. No difference in nodule bacterial diversity was found between sites. The relative abundance of rhizobial genera varied amongst plant species and sites, with a shift in dominance from Bradyrhizobium to Rhizobium species between sites 1 and 2. Conclusions: Our results show that even 6 years after burning, ecosystem remained under N stress and BNF was still the main mechanism for N acquisition by the understorey legumes.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherSpringer Science and Business Media LLC
dc.relation.ispartofpagefrom122
dc.relation.ispartofpageto132
dc.relation.ispartofissue1
dc.relation.ispartofjournalJournal of Soils and Sediments
dc.relation.ispartofvolume20
dc.subject.fieldofresearchEarth sciences
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchAgricultural, veterinary and food sciences
dc.subject.fieldofresearchcode37
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode30
dc.titleBiological nitrogen fixation by two Acacia species and associated root-nodule bacteria in a suburban Australian forest subjected to prescribed burning
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationReverchon, F; Abdullah, KM; Bai, SH; Villafán, E; Blumfield, TJ; Patel, B; Xu, Z, Biological nitrogen fixation by two Acacia species and associated root-nodule bacteria in a suburban Australian forest subjected to prescribed burning, Journal of Soils and Sediments, 2019, 20 (1), pp. 122-132
dc.date.updated2020-01-24T00:49:54Z
gro.hasfulltextNo Full Text
gro.griffith.authorBlumfield, Tim J.
gro.griffith.authorXu, Zhihong
gro.griffith.authorHosseini-Bai, Shahla


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