18 Fire on the mountain: A multi-scale, multi- proxy assessment of the resilience of cool temperate rainforest to fire in Victoria’s Central Highlands Patrick J. Baker School of Biological Sciences, Monash University, Clayton, Victoria
[email protected] Rohan Simkin Monash University, Clayton, Victoria Nina Pappas Monash University, Clayton, Victoria Alex McLeod Monash University, Clayton, Victoria Merna McKenzie Monash University, Clayton, Victoria Introduction A common feature of many Australian landscapes is the interdigitation of eucalypt- dominated sclerophyll forest with rainforest. In most instances, the eucalypt forests dominate the landscape, with rainforest restricted to relatively small fragments and strips that are often (but not always) associated with topographic features such as riparian zones or southeastern- facing slopes. However, these patterns reflect the current state of a dynamic system. Over several terra australis 34 376 Patrick J. Baker et al. hundreds of thousands of years, the relative dominance of the rainforests and eucalypt forests has waxed and waned across these landscapes in near synchrony (Kershaw et al. 2002; Sniderman et al. 2009). During periods of relatively warm, dry conditions, the eucalypt- dominated vegetation has expanded and the rainforest contracted across the landscape. When the climate has been relatively cool and moist, the rainforests have expanded and the eucalypt forest contracted. This is, in part, thought to be a direct consequence of the ambient environmental conditions and their impact on regeneration success. However, the indirect influence of climate, in particular as a driver of fire regimes, may be as important, if not more important, in defining the structure, composition and relative abundance of rainforest and eucalypt taxa at the landscape scale.