Seed size an important factor for the germination response of legume seeds subjected to simulated post-fire soil temperatures
Sarah J. Hill
A E and Tony D. Auld B C D
+ Author Affiliations
- Author Affiliations
A School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
B Department of Planning, Industry and Environment NSW, Science Division, PO Box 1967, Hurstville NSW 2220, Australia.
C Centre for Ecosystem Science, University of New South Wales, Sydney, NSW 2052, Australia.
D School of Earth, Atmospheric and Life Sciences, University of Wollongong, Wollongong, NSW 2522, Australia.
E Corresponding author. Email: sarah.hill@une.edu.au
International Journal of Wildland Fire 29(7) 618-627 https://doi.org/10.1071/WF19027
Submitted: 22 February 2019 Accepted: 8 March 2020 Published: 31 March 2020
Abstract
Potential impacts of soil temperatures in a post-fire environment were examined for seeds of legume species with a physical seed dormancy typically found in the eucalypt communities in eastern Australia. Soil temperatures in a post-fire environment may be elevated owing to increased solar radiation and this may influence germination of species with soil-stored seed banks. Seeds were heated at 50, 60 or 70°C, with one unheated control, for 3 h per day for 5 days to simulate soil temperatures where canopy gaps existed. More germination of small-seeded species (<12.6 mg) occurred owing to changes in simulated soil temperatures than large-seeded species (>14.0 mg). Temperatures up to 70°C significantly increased the germination of species with relatively small-sized seeds than large-seeded species (>70°C). This study demonstrated that small-seeded species are able to germinate across a range of temperatures (50–70°C) and can have dormancy broken either during the passage of a fire, or after fire from increased solar radiation, potentially resulting in the decline of the post-fire residual soil seed bank. In contrast, post-fire germination of large-seeded species may be dependent solely on the degree of soil heating during the passage of fire and the species may have a relatively stable residual soil seed bank thereafter.
Additional keywords: dormancy thresholds, Fabaceae, heat shock, physical dormancy.
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