Senior
Sensitivity of Spartina alterniflora Aboveground Biomass Estimates to Imaging Parameters and Model Types
Coastal salt marshes sequester large quantities of “blue carbon” in plant biomass and sediments, in addition to providing numerous other valuable ecosystem functions and services, including storm and erosion protection, water filtration, and habitat provisions. However, these ecosystems are increasingly threatened by external stressors, such as rising sea levels, pollution, and land conversion, which result in large losses of tidal marsh habitat and threaten salt marsh vegetation, the most prominent of which is the species Spartina alterniflora, making the measurement of plant biomass critical for understanding how carbon storage may be affected and how conservation efforts may be improved. Given that field studies are often challenging to carry out on a large scale in salt marshes, remote sensing is a valuable tool for assessing aboveground plant biomass (AGB).
This study aims to create predictive models of three stressors (leaf nitrogen, porewater salinity, and porewater oxidation-reduction potential (ORP)) using hyperspectral imagery. Using hyperspectral imaging data and salt marsh chronosequence from the barrier island Hog Island in Virginia, the spectral and biophysical responses from field plots were used to create predictive models of stress, which were then applied to a series of marsh chronosequence sites that range in age and degree of stressor impact. After applying statistical analyses such as ANOVA, Tukey HSD, and Pearson correlation tests, in addition to imagery analyses through the program ENVI in order to examine different parameters, models were developed successfully for a range of salinity and leaf nitrogen content using both vegetation indices and reflectance data. The development of these spectral models may provide an efficient way to evaluate marsh states and stressors in the field at a large scale, which can inform marsh management decisions.
Outside of Science Research, Sandy is the president of Science Club, co-president of NHS, and vice president of Best Buddies. In addition, she loves to read and play tennis in her free time. She plans to major in environmental science and continue pursuing research in college.
Acknowledgments:
Mrs. Griffin
Her mentor, Dr. Charles Bachmann
Her Science Research Peers