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- B11J-1590: Spatial Variation and Environmental Drivers of Seasonal Greenness Decline: a Case Study across NEON Sites
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Board 1590‚ Hall EFG (Poster Hall)NOLA CC
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Sabrina Chow, Cornell University (First Author, Presenting Author)
Cameron Scholl, Cornell University
Yixin Ma, Cornell University
Xiangtao Xu, Cornell University
In the field of remote sensing, satellite images can be used to pick up vegetation greenness. Surprisingly, many studies have noted a slight decline in greenness during the late spring and summer. While previous work has proposed reasons like changing leaf angles or deterioration of leaf quality, there has yet to be a definitive ecological explanation. This study considers seasonal greenness decline across a variety of vegetation types using National Ecological Observatory Network (NEON) sites. Using code to process satellite images, seasonal greenness decline was calculated at each site, and the resulting data was analyzed within each site and between all the sites. The results showed that warmer temperatures were consistently associated with steeper declines, perhaps reflecting changes in leaf angle as a response to heat. In addition, site-level declines were shown to vary according to biome, with deciduous and mixed forests tending to have steeper declines than others. Ultimately, this study looks at potential causes for seasonal greenness decline across major biomes in the contiguous United States for the first time. By establishing when and where certain processes drive the decline, future studies can use seasonal greenness decline as a way to map out plant functional traits.
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