Changes in Vegetation Cover of Yukon River Drainages in Interior Alaska Estimated from MODIS Greenness Trends, 2000 to 2018

Potter, Christopher

关键词: ECOSYSTEMS;    IMAGE CLASSIFICATION;    IMAGING SPECTROMETERS;    NORMALIZED DIFFERENCE VEGETATION INDEX;    STATISTICAL ANALYSIS;    TIME SERIES ANALYSIS;    VEGETATION GROWTH;   

RP-ID  :  ARC-E-DAA-TN67403

学科分类：地球科学(综合)

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来源: NASA Technical Reports Server

【 摘 要 】

Trends and transitions in the growing season MODerate resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) time-series at 250-m resolution were analyzed for the period from 2000 to 2018 to understand recent patterns of vegetation change in ecosystems of the Yukon River basin in interior Alaska. Statistical analysis of changes in the NDVI time series was conducted using the "Breaks for Additive Seasonal and Trend" method (BFAST). This structural change analysis indicated that NDVI breakpoints and negative 18-yr trends in vegetation greenness over the years since 2000 could be explained in large part by the impacts of severe wildfires, commonly affecting shrubland and forested ecosystems at relatively low elevations (< 300 m).