Skip to Main Content
Browning of the landscape of interior Alaska based on 1986-2009 Landsat sensor NDVIAuthor(s): Rebecca A. Baird; David Verbyla; Teresa N. Hollingsworth
Source: Canadian Journal of Forestry Research. 42: 1371-1392
Publication Series: Scientific Journal (JRNL)
Station: Pacific Northwest Research Station
PDF: Download Publication (2.3 MB)
DescriptionWe used a time series of 1986-2009 Landsat sensor data to compute the Normalized Difference Vegetation Index (NDVI) for 30 m pixels within the Bonanza Creek Experimental Forest of interior Alaska. Based on simple linear regression, we found significant (p < 0.05) declining trends in mean NDVI of three dominant landscape types of floodplains, lowlands, and uplands. At smaller patch sizes, similar declining trends occurred among topographic classes of north- and south-facing slopes and valley bottoms and among forest classes, including black spruce (Picea mariana (Mill.) B.S.P.). Significant positive trends in mean NDVI occurred only in areas that were recently burned, whereas wetlands had no significant trend. The greatest departure from the NDVI trend line occurred following the 2004 drought for all forest classes except black spruce, which dominates the coldest sites, and balsam poplar (Populus balsamifera L.), which occurs on low, moist terraces within the Tanana River floodplain. The consistent long-term declining trend at several spatial scales may be due to a regional climatic regime shift that occurred in the mid-1970s.
- Visit PNW's Publication Request Page to request a hard copy of this publication.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationBaird, Rebecca A.; Verbyla, David; Hollingsworth, Teresa N. 2012. Browning of the landscape of interior Alaska based on 1986-2009 Landsat sensor NDVI. Canadian Journal of Forestry Research. 42: 1371-1392.
Keywordsclimate change, NDVI, timeseries, Bonanza Greek Experimental Forest, Alaska
- Barred Owl (Strix varia) nest site characteristics in the boreal forest of Saskatchewan, Canada
- Characterizing forest vegetation of the Tanana Valley: what can forest inventory and analysis deliver?
- Energy Values of Nine Populus Clones
XML: View XML