Editing Eucalyptus regnans (section)

== Distribution and habitat ==
''Eucalyptus regnans'' occurs across a 700&nbsp;km by 500&nbsp;km region in the southern Australian states of Victoria and Tasmania. The species grows mostly in cool, mountainous areas that receive [[rainfall]] over {{convert|1000|mm|in|abbr=}} per year. ''E. regnans'' reaches its highest elevations of about {{convert|1100|m|ft|abbr=}} ASL on the [[Errinundra Plateau]] in north-eastern Victoria, and its lowest elevations near sea-level in some southern parts of its Tasmanian distribution.<ref name=":1" />

In Victoria, stands of tall trees are found in the [[Otway Ranges|Otway]], [[Dandenong Ranges|Dandenong]], [[Yarra Ranges|Yarra]] and [[Strzelecki Ranges|Strzelecki]] ranges as well as [[Mount Disappointment (Australia)|Mount Disappointment]] and [[East Gippsland]].<ref name="Mifsud2002" /> However, the distribution is much reduced. Most of the ''E. regnans'' forest across Gippsland was cleared for farmland between 1860 and 1880, and in the Otway Ranges between 1880 and 1900, while severe bushfires hit in 1851, 1898 and 1939.<ref name="Ashton 1953">{{cite journal|last=Ashton|first=David Hungerford|author-link=David Ashton (botanist)|date=1953|title=The ecology of ''Eucalyptus regnans'' F. Muell.: the species and its frost resistance |journal=Australian Journal of Botany|volume=6|issue=2|pages=154–76|doi=10.1071/BT9580154}}</ref> In Tasmania, ''E. regnans'' is found in the [[Huon Valley|Huon]] and [[River Derwent (Tasmania)|Derwent River]] valleys in the southeast of the state.<ref name="Boland" />

In the Otways, the species is found in wet forest in pure stands or growing in association with mountain grey gum (''[[Eucalyptus cypellocarpa]]''), messmate (''E. obliqua'') and Victorian blue gum (''[[Eucalyptus globulus|E. globulus]]'' subsp. ''bicostata'').<ref name="BATR1997">{{cite book|title=Biodiversity Assessment Technical Report|publisher=Joint Commonwealth and Victorian Regional Forest Agreement (RFA) Steering Committee|year=1997|url=https://www.academia.edu/1759784|isbn=0-642-27432-0|last1=Dovey|first1=Liz}}</ref> Other trees it grows with include manna gum (''[[Eucalyptus viminalis]]''), shining gum (''[[Eucalyptus nitens|E. nitens]]''), myrtle beech (''[[Nothofagus cunninghamii]]'') and silver wattle (''[[Acacia dealbata]]'')<ref name="Boland" /> The mountain ash-dominated forest can be interspersed with rainforest understory, with such species as southern sassafras (''[[Atherosperma|Atherosperma moschatum]]''), celery-top pine (''[[Phyllocladus aspleniifolius]]''), leatherwood (''[[Eucryphia lucida]]'') and horizontal (''[[Anodopetalum biglandulosum]]'').<ref name="WoodHua2010">{{cite journal|last1=Wood|first1=S.W.|last2=Hua|first2=Q.|last3=Allen|first3=K.J.|last4=Bowman|first4=D.M.J.S.|year=2010|title=Age and growth of a fire prone Tasmanian temperate old-growth forest stand dominated by ''Eucalyptus regnans'', the world's tallest angiosperm|journal=Forest Ecology and Management|volume=260|issue=4|pages=438–47|doi=10.1016/j.foreco.2010.04.037|issn=0378-1127}}</ref> The mountain ash is most suited to deep friable clay loam soils, often of volcanic origin; in areas of poorer soils, it can be confined to watercourses and valleys.<ref name="Boland" />