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The effects of temperature and salinity on Acacia harpophylla (brigalow) (Mimosaceae) germination

Reichman, S. M., Bellairs, Sean M. and Mulligan, D. R. (2006). The effects of temperature and salinity on Acacia harpophylla (brigalow) (Mimosaceae) germination. Rangeland Journal,28(2):175-178.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 5 times in Scopus Article | Citations

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IRMA ID 77258851xPUB7
Title The effects of temperature and salinity on Acacia harpophylla (brigalow) (Mimosaceae) germination
Author Reichman, S. M.
Bellairs, Sean M.
Mulligan, D. R.
Journal Name Rangeland Journal
Publication Date 2006
Volume Number 28
Issue Number 2
ISSN 1036-9872   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33750958701
Start Page 175
End Page 178
Total Pages 4
Place of Publication Australia
Publisher CSIRO Publishing
Field of Research 0502 - Environmental Science and Management
0607 - Plant Biology
HERDC Category C1 - Journal Article (DEST)
Abstract Acacia harpophylla F. Muell. (brigalow) used to naturally occur over a range of about 50 000 km(2) in Queensland and New South Wales, Australia. Large scale clearing for agriculture has reduced the area to less than 20 000 km(2) and it is estimated that 20-25% of vertebrate fauna living in brigalow communities will become locally extinct as a result of the current clearing induced loss of habitat. Some coal mining companies in central Queensland have become interested in providing habitat for the endangered bridle nail-tailed wallaby that lives in brigalow vegetation. However, there is little known about establishment techniques for brigalow on mine sites and other disturbed ground; an understanding of brigalow biology and ecology is required to assist in the conservation of this threatened vegetation community and for re-creation of bridled nail-tail wallaby habitat in the post mining landscape. Brigalow is an unusual species of Acacia because it is not hard-seeded and germinates readily without the need to break seed-coat imposed dormancy. Germination trials were undertaken to test the ability of brigalow seed to germinate with a range of temperatures and salinity levels similar to those experienced in coal mine spoil. Optimum germination was found to occur at temperatures from 15 to 38 degrees C and no germination was recorded at 45 degrees C. Brigalow was very tolerant of high salt levels and germinated at percentages greater than 50% up to the highest salinity tested, 30 dS/m. Germination of greater than 90% occurred up to an electrical conductivity of 20 dS/m. The results indicate brigalow seed can be sown in summer when rains are most likely to occur, however, shading of the seed with extra soil or mulch may ensure the ground surface does not become too hot for germination. Because of its ability to germinate at high salinity levels, brigalow may be suitable for use in saline mine wastes which are common on sites to be rehabilitated after mining.
Keywords australia
mined land
seed germination
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