Floristic variation in Sphagnum-dominated peatland communities of the Central Highlands, Victoria J.M. Shannon* and J.W. Morgan Department of Botany, La Trobe University, Bundoora, Victoria 3086, AUSTRALIA * Corresponding author email
[email protected] Abstract: The floristic composition ofSphagnum -dominated peatlands in the Central Highlands region of Victoria was surveyed (37º 25´ S; 145º 50´ E). NMDS ordination and cluster analysis divided the peatland sites into two broad groups with altitude being the most important factor separating these groups. Other important factors were aspect, slope and the amount of shade. Group 1 included subalpine sites that are similar to those found at higher altitudes further east in Victoria. Important species included Empodisma minus, Epacris paludosa, Richea continentis and Baeckea gunniana. The two species of Sphagnum present were Sphagnum cristatum and the more inundation-tolerant Sphagnum novo- zelandicum. Group 2 included montane peatlands with abundant Sphagnum cristatum. These sites range from broad wet heaths dominated by Richea victoriana and Carex appressa, to narrower cool temperate rainforest and riparian systems. The ‘rainforest’ peatlands are characterised by Leptospermum grandifolium, Nothofagus cunninghamii, Carex appressa and Blechnum penna-marina, and are in varying stages of post-fire succession regulated by site- specific microclimate. The conservation status and catchment function of these peatlands are briefly discussed. Cunninghamia (2007) 10(1): 59–76 Introduction montane areas elsewhere have received less scrutiny. In Victoria, Sphagnum systems have been incorporated in Sphagnum mires and peatlands are most prominent at studies of subalpine vegetation at the Bennison Plains (Farrell higher latitudes and altitudes. Watertables constantly at, or & Ashton 1973), Lake Mountain (Ashton & Hargreaves near the soil surface, are required for peatlands to develop 1983), Mount Buffalo (Wahren & Walsh 2000), the Snowy and persist.