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Forest fire may disrupt plant-microbial feedbacks

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Senior, JK, O'Reilly-Wapstra, J ORCID: 0000-0003-4801-4412, Schweitzer, JA, Bailey, JK and Potts, BM ORCID: 0000-0001-6244-289X 2018 , 'Forest fire may disrupt plant-microbial feedbacks' , Plant Ecology, vol. 219, no. 5 , pp. 497-504 , doi: 10.1007/s11258-018-0811-9.

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Abstract

Plant–microbial feedbacks are important drivers of plant community structure and dynamics. These feedbacks are driven by the variable modification of soil microbial communities by different plant species. However, other factors besides plant species can influence soil communities and potentially interact with plant–microbial feedbacks. We tested for plant–microbial feedbacks in two Eucalyptus species, E. globulus and E. obliqua, and the influence of forest fire on these feedbacks. We collected soils from beneath mature trees of both species within native forest stands on the Forestier Peninsula, Tasmania, Australia, that had or had not been burnt by a recent forest fire. These soils were subsequently used to inoculate seedlings of both species in a glasshouse experiment. We hypothesized that (i) eucalypt seedlings would respond differently to inoculation with conspecific versus heterospecific soils (i.e., exhibit plant–microbial feedbacks) and (ii) these feedbacks would be removed by forest fire. For each species, linear mixed effects models tested for differences in seedling survival and biomass in response to inoculation with conspecific versus heterospecific soils that had been collected from either unburnt or burnt stands. Eucalyptus globulus displayed a response consistent with a positive plant–microbial feedback, where seedlings performed better when inoculated with conspecific versus heterospecific soils. However, this effect was only present when seedlings were inoculated with unburnt soils, suggesting that fire removed the positive effect of E. globulus inoculum. These findings show that external environmental factors can interact with plant–microbial feedbacks, with possible implications for plant community structure and dynamics.

Item Type: Article
Authors/Creators:Senior, JK and O'Reilly-Wapstra, J and Schweitzer, JA and Bailey, JK and Potts, BM
Keywords: Eucalyptus, forest fire, plant–microbial feedback, soil microbial communities, soil inoculation
Journal or Publication Title: Plant Ecology
Publisher: Kluwer Academic Publ
ISSN: 1385-0237
DOI / ID Number: 10.1007/s11258-018-0811-9
Copyright Information:

© 2018 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

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