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Arthur Rylah Institute Technical Paper Series Report No. 151 Arthur Rylah Institute Technical Paper Series Report No. 151 Arthur Rylah Institute for Environmental Research Arthur Rylah Institute for Environmental Research Technical Series Report No. 151 Recovery of Silurian Limestone Pomaderris Shrubland after the 2003 bushfires in north-east Victoria. Judy Downe and Fiona Coates December 2004 Published by the Victorian Government Department of Sustainability and Environment Melbourne, December 2004 © The State of Victoria Department of Sustainability and Environment 2004 This publication is copyright. No part may be reproduced by any process except in accordance with the provisions of the Copyright Act 1968. Authorised by the Victorian Government, 8 Nicholson Street, East Melbourne. For more information contact the DSE Customer Service Centre 136 186 ISBN 1 74152 084 3 ISSN 0810-5774 Disclaimer This publication may be of assistance to you but the State of Victoria and its employees do not guarantee that the publication is without flaw of any kind or is wholly appropriate for your particular purposes and therefore disclaims all liability for any error, loss or other consequence which may arise from you relying on any information in this publication. Citation Downe, J. & Coates, F. (2004) Recovery of Silurian Limestone Pomaderris Shrubland after the 2003 bushfires in north-east Victoria. Arthur Rylah Institute for Environmental Research Technical Report No. 151. Department of Sustainability and Environment, Victoria, Melbourne. Front cover: Burnt slopes at Marble Gully and post-fire regeneration of key species. III Contents Contents ...................................................................................................................................................4 List of Figures and Tables ....................................................................................................................5 Executive Summary................................................................................................................................6 Introduction.............................................................................................................................................7 Methods................................................................................................................................................. 10 Results ................................................................................................................................................... 14 Threats to post-fire recovery............................................................................................................ 25 Discussion............................................................................................................................................. 27 Recommendations............................................................................................................................... 31 Acknowledgments............................................................................................................................... 32 References............................................................................................................................................. 33 Appendix 1 ........................................................................................................................................... 35 Appendix 2 ........................................................................................................................................... 36 Appendix 3 ........................................................................................................................................... 46 4 List of Figures and Tables Figures Species ......................................................................................................................................................8 Figure 1. Aerial view of Marble Gully showing location of the Transect Lines, Hills (1, 2 and 3) and Old Hut Creek Track....................................................................................................... 13 Figure 2. Regenerating Olearia astroloba at Marble Gully 2004. ............................................. 20 Figure 3. Regenerating Ozothamnus adnatus at Marble Gully 2004....................................... 21 Figure 4. Pimelea flava var. dichotoma seedlings at Marble Gully 2004................................ 22 Figure 5. Pomaderris oraria subsp. calcicola resprouting at Marble Gully, 2004. ............... 23 Tables Table 1. Significant species recorded at Marble Gully in Silurian Limestone Pomaderris Shrubland vegetation.....................................................................................................................8 Table 2. Vital attributes and their codes (Noble & Slatyer 1980)............................................. 12 Table 3. Allocasuarina verticillata - Total and mean number of seedlings and resprouts, and mean seedling and resprout height, for key common species.......................................... 16 Table 4. Banksia marginata - Total and mean number of seedlings and resprouts for key common species........................................................................................................................... 17 Table 6. Teucrium corymbosum - Total and mean number of seedlings and resprouts, and mean seedling and resprout height, for key common species. ......................................... 18 Table 7. Frequency of occurrence of minor species by life form in cover/abundance classes. ......................................................................................................................................................... 19 Table 8. Olearia astroloba - Number of seedlings (alive and dead) and resprouts (alive and dead), mean seedling and resprout density and mean seedling and resprout height. 20 Table 9. Ozothamnus adnatus - Number of seedlings (alive and dead) and resprouts (alive and dead), mean seedling and resprout density and mean seedling and resprout height. ......................................................................................................................................................... 21 Table 10. Pimelea flava var. dichotoma - Number of seedlings (alive and dead) and resprouts (alive and dead), mean seedling and resprout density and mean seedling and resprout height. ............................................................................................................................................ 22 Table 11. Pomaderris oraria subsp. calcicola - Number of seedlings (alive and dead) and resprouts (alive and dead), mean seedling and resprout density and mean seedling and resprout height............................................................................................................................. 23 Table 12. Pultenaea densifolia - Number of seedlings (alive and dead) and resprouts (alive and dead), mean seedling and resprout density and mean seedling and resprout height. ......................................................................................................................................................... 24 Table 13. Arthropodium sp. 1 - Frequency of occurrence in cover/abundance classes..... 24 Table 14. Introduced Species recorded at Marble Gully............................................................ 26 5 Executive Summary The status and post-fire recovery of the nationally threatened community Silurian Limestone Pomaderris Shrubland was assessed after the 2003 bushfires under the Victorian Bushfire Recovery Program. Prior to 2003 there had been no records of fire at Marble Gully for at least one hundred years. The community is restricted to limestone geology, occurring only at Marble Gully near Omeo in East Gippsland. Species fire response characteristics, threats to recovery and management requirements for the vegetation community were identified. Permanent transects were established to monitor post-fire recovery of key common species, minor species and five rare or threatened species. The influence of fire on species composition was determined by comparing the species list from pre-fire studies with a list compiled from this study. Community structure was severely affected with the canopy virtually totally destroyed. All lifeforms were regenerating but it will take many years, with the absence of fire, to determine if the community will return to its original structure. 213 vascular species, including 38 weeds, were recorded pre- and post-fire. 85 of these were recorded in 2003 plus 34 species that were previously unknown. Response to fire and/or vital attribute data were collected for 115 indigenous species. Nine rare or threatened species were re-located during the 2004 survey: Olearia astroloba (Vv), Ozothamnus adnatus (v), Arthropodium sp.1 (r), Pimelea flava subsp. dichotoma (r), P. pauciflora (r), Pomaderris oraria subsp. calcicola (r), Pultenaea densifolia (r), Vittadinia tenuissima (r) and Senna aciphylla (r). Two rare species previously recorded were not found - Asplenium trichomanes subsp. quadrivalens (r) and Desmodium varians (k). Two of three additional species known to be significant at Marble Gully due to their disjunct geographical distribution, were also found (Austostipa scabra subsp. falcata and Ptilotus spathulatus). One other disjunct species previously recorded at the site, Isoetopsis graminifolia, was not re- located. The study showed that most rare or threatened species regenerated
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