The impact of climate change and wildfire on decadal alpine vegetation dynamics
Brodie Verrall
A * , Patrick Norman B , Brendan Mackey B , Scout Fisher C and Jack Dodd C
+ Author Affiliations
- Author Affiliations
A Centre of Planetary Health and Food Security, Griffith University, Gold Coast, Qld 4222, Australia.
B Griffith Climate Action Beacon, Griffith University, Gold Coast, Qld 4222, Australia.
C New South Wales National Parks and Wildlife Service, Jindabyne, NSW 2627, Australia.
Australian Journal of Botany 71(5) 231-251 https://doi.org/10.1071/BT23002
Submitted: 2 January 2023 Accepted: 26 May 2023 Published: 16 June 2023
© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Context: Climate-induced changes of alpine vegetation diversity, cover and composition have been recorded globally, but most insights have been gleaned from field studies over small spatiotemporal scales.
Aims: We assess dynamics in climate and vegetation of Australia’s highest and most biologically diverse alpine area that surrounds Mount Kosciuszko (~455 km2), as well as recovery following the 2003 wildfires.
Methods: Climatic changes were analysed using gridded climate data for mean annual temperature (1910–2019) and seasonal precipitation (1900–2019), and changes in snow cover were assessed from snow course records (1954–2021). A vegetation cover time series (1990, 2000, 2010, 2020) was modelled with an optimised random forest classification using recursive feature selection, and the LandTrendr algorithm was used to detect areas burnt during wildfires.
Key results: Over time, temperatures and summer precipitation increased, whereas snow cover and winter precipitation decreased. Subsequently, vegetation dynamics were dominated by the densification of subalpine woodlands at lower elevations, replacing dry and wet heathlands. There was treeline stasis but upslope advancement of dry and wet shrublines but grassland vegetation types were relatively stable. However, in burnt areas there was suppressed upslope advancement of shrublines, treeline recession and relatively less expansion of subalpine woodlands.
Conclusions: Alpine vegetation may be impacted by climate change incrementally through relatively gradual changes in climatic conditions, and transformatively through landscape-level disturbance from wildfires.
Implications: Higher temperatures and altered precipitation regimes increase the frequency and severity of wildfires, which may be amplified by increasing fuel loads and dryness from the proliferation and advance of woody vegetation in alpine areas.
Keywords: alpine vegetation cover classification, alpine wildfire regimes, Australian Alps, disturbance attribution, land-cover change, Landsat 5/7/8 time series, LandTrendr algorithm, multispectral remote sensing, optimised random forest modelling, plant–climate interactions.
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