Territory Stories

Top End Native Plant Society newsletter



Top End Native Plant Society newsletter

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TENPS newsletter


Top End Native Plant Society


Top End Native Plant Society newsletter; Top End Native Plant Society newsletter; E-Journals; PublicationNT




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Top End Native Plant Society; Periodicals; Plant; Darwin Region

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Top End Native Plant Society

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Top End Native Plant Society



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5 unsuitable for fire, being sparse clay soil with little grass present. What determines the presence of trees in this area? And in the southern inland, it is not yet known what determines the transition from eucalypt, to mulga (Acacia), dominated vegetation. In the north, this transition is defined by fire. Mulga (below) is killed by fires but grows back from seed. Frequent fires in the north eliminate the seed bank. Other examples of fire responses included Mountain Ash (Eucalyptus regnans) in southern Australia where intense fires are followed by massive seedling recruitment and self-thinning; and those of Snow Gums (Eucalyptus pauciflora) in the alpine areas, with similar responses to trees in the Top End. The ensuing discussion was lively and mostly focused on savannah. Some examples included the interactions between termites, fires and wildlife dependent on the hollows, including the impact on termites of frequent fires and cattle (trampling and overgrazing) in grasslands. If too frequent fire and/or cattle can eliminate the termites, what becomes of the many species of animals that rely upon tree hollows to survive? The impact of too frequent fires on tree recruitment was also discussed. The role of annual sorghum (Sorghum intrans) was raised, genetic evidence suggest it has been part of the landscape for a very long time. Eucalyptus tetrodonta seedling recruitment is a rare event, by contrast more than 90% of its re-sprouts after fire, will survive. Some grow very rapidly; many others remain small although surviving for decades. It was generally agreed a fire free interval of around 3-5 years appears essential to ensure savannah tree species re-establish sustainably. Our thanks to Garry for an absorbing and thought provoking presentation. Article by Peter Ebsworth, photos by supplied by Garry Cook. Premna serratifolia in flower in a garden at TWP last month, photographed by Sarah Hirst. Report on Mica Beach Sailing Field Trip: Saturday 1 September. We had a great field trip to Mica Beach travelling with Louise Becker on the 37 ft yacht Boussole. After departing from Bayview Marina we had a gentle sail with little wind providing plenty of time for brewed coffee and chatting along the way. We were at Mica Beach by late morning and took a couple of trips in Louises tender to get everyone on shore. Given we had walked northwards along the beach on our previous trip in 2011, this time we explored to the south. A great section of coastline with rocky headlands to clamber around and a series of short sandy beaches. Multi-coloured rocks photographed by D.T. Liddle.

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