Journal
REMOTE SENSING
Volume 2, Issue 12, Pages 2729-2747Publisher
MDPI
DOI: 10.3390/rs2122729
Keywords
boreal forest; Alaska; NDVI; browning; climate warming
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Funding
- Bonanza Creek Long-Term Ecological Research (LTER) program
- NSF [DEB-0423442]
- USDA Forest Service, Pacific Northwest Research Station [PNW01-JV11261952-231]
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We used twelve Landsat scenes from the 1980s-2009 and regional 2000-2009 MODIS data to examine the long-term trend in the normalized difference vegetation index (NDVI) within unburned areas of the Alaskan boreal forest. Our analysis shows that there has been a declining trend in NDVI in this region, with the strongest. browning trend. occurring in eastern Alaska where the climate during the growing season is relatively dry and warm. Possible reasons for the browning trend are decreased vegetation due to temperature-induced drought stress and increased infestations of insect pests.
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