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Forty years of lowland monsoon rainforest expansion in Kakadu National Park, Northern Australia


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Banfai, DS and Bowman, DMJS 2006 , 'Forty years of lowland monsoon rainforest expansion in Kakadu National Park, Northern Australia' , Biological Conservation, vol. 131, no. 4 , pp. 553-565 , doi: 10.1016/j.biocon.2006.03.002.

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Monsoon rainforest is a key habitat in sustaining the natural and cultural values for which
Kakadu National Park is World Heritage listed. The integrity of monsoon rainforest boundaries
was thought to have been threatened by an increase in fire and feral animal disturbance
over the last few decades. However, as no broad-scale assessment of rainforest
boundary change had been undertaken, the rate and even direction of boundary change
remained uncertain. In this study changes to the boundaries of 50 monsoon rainforest
patches were assessed using temporal sequences of digitised aerial photography, with a
view to understanding the relative importance of the drivers of change. Boundaries were
compared for each of the years 1964, 1984, 1991 and 2004. Vegetation types were manually
classified for each year with a 20 x 20 m point lattice, based primarily on the distance
between tree crowns. Transition matrices, size-class distributions and fragmentation indices
were calculated. Field samples of a subset of 30 rainforest patches supported the accuracy
of the GIS-based mapping of rainforest boundaries. Rainforest patches increased in
size between 1964 and 2004 by an average of 28.8%, with an average area increase of
4.0 ha. The expansion is likely to have been primarily driven by increases in variables such
as rainfall and atmospheric CO2, but has been strongly mediated by fire regime. This project
has provided land managers with an appreciation of the extent and causes of landscape-
scale changes to rainforest boundaries. This will contribute to 'adaptive
management' programs, especially with respect to fire management.

Item Type: Article
Authors/Creators:Banfai, DS and Bowman, DMJS
Keywords: Aboriginal management Aerial photography Fire ecology Vegetation dynamics Global environmental change
Journal or Publication Title: Biological Conservation
DOI / ID Number: 10.1016/j.biocon.2006.03.002
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