Vegetation shifts observed in arctic tundra 17 years after fire

TitleVegetation shifts observed in arctic tundra 17 years after fire
Publication TypeJournal Article
Year of Publication2012
AuthorsBarrett K., Rocha A., van de Weg M.J, Shaver G.
JournalRemote Sensing LettersRemote Sensing LettersRemote Sensing Letters
ISBN Number2150-704X
Accession NumberISI:000308398400010
Keywordsburn severity, climatic-change, disturbance, northern alaska, patterns, recovery, USA

With anticipated climate change, tundra fires are expected to occur more frequently in the future, but data on the long-term effects of fire on tundra vegetation composition are scarce. This study addresses changes in vegetation structure that have persisted for 17 years after a tundra fire on the North Slope of Alaska. Fire-related shifts in vegetation composition were assessed from remote-sensing imagery and ground observations of the burn scar and an adjacent control site. Early-season remotely sensed imagery from the burn scar exhibits a low vegetation index compared with the control site, whereas the late-season signal is slightly higher. The range and maximum vegetation index are greater in the burn scar, although the mean annual values do not differ among the sites. Ground observations revealed a greater abundance of moss in the unburned site, which may account for the high early growing season normalized difference vegetation index (NDVI) anomaly relative to the burn. The abundance of graminoid species and an absence of Betula nana in the post-fire tundra sites may also be responsible for the spectral differences observed in the remotely sensed imagery. The partial replacement of tundra by graminoid-dominated ecosystems has been predicted by the ALFRESCO model of disturbance, climate and vegetation succession.

Short TitleRemote Sens LettRemote Sens Lett
Alternate JournalRemote Sens Lett