| Autor: |
David Taylor, Philip Pisanu, Duncan A. Mackay, Richard J.-P. Davies, Molly A. Whalen |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Biological Conservation. 158:287-295 |
| ISSN: |
0006-3207 |
| DOI: |
10.1016/j.biocon.2012.08.013 |
| Popis: |
Soil collected from 38 sites on Kangaroo Island in South Australia, containing small remnants of senescentEucalyptus cneorifolia-dominated mallee, was subject ex situ to both smoke aerosol and heat treatment tosimulate burning. Further soil from a subset of 29 of the sites was left untreated as a control. A total of113 native plant species and 50 introduced species germinated across all sites. Fifty-three of the nativeplant species that germinated were absent in the above-ground vegetation, including twelve rare orthreatened species, and three species previously unrecorded from Kangaroo Island. Fourteen native spe-cies and six introduced species germinated in heat plus smoke treated soil but not in untreated soil fromthe same sites. Non-metric multidimensional scaling ordination indicated differences in native speciescomposition between sites with a long history of sustained livestock grazing (‘‘grazed’’ sites) and largelyungrazed sites (‘‘ungrazed’’ sites). On average, significantly more native species germinated from treatedsoil sampled from ‘‘ungrazed’’ sites than were found in the standing vegetation, while for ‘‘grazed’’ sitesthis difference was not significant. This indicates the greater potential for post-fire regeneration of nativevegetation from the soil seed bank of ungrazed sites than from that of long grazed sites. Both ‘‘ungrazed’’and ‘‘grazed’’ sites contained weeds in their soil seed banks, including some species which were stimu-lated by heat plus smoke. This indicated that competition from weeds is potentially a problem when fireis used as a management tool to regenerate senescent understoreys. 2012 Elsevier Ltd. All rights reserved. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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