July 23, 2014

New Research by Brown MBL Graduate Student Published in JGR

Xi Yang, Brown MBL graduate student, collects leaf data on seasonality on Martha's Vineyard, MA

Xi Yang, Brown MBL graduate student, collects leaf data on seasonality on Martha’s Vineyard, MA

Xi Yang, a fourth year graduate student advised by Jim Tang at the Ecosystems Center at MBL and Jack Mustard in the Geological Sciences Department at Brown University, recently published his work on plant phenology in the Journal of Geophysical Research: Biogeosciences.  Xi and the scientists from MBL and Brown University set up a digital camera in a deciduous white oak dominated state forest on Martha’s Vineyard in the spring of 2011 to discover more about the relationship between canopy level camera phenological metrics and leaf properties and the relationship between remote sensing data and camera phenological metrics.

Digital repeat photography has become a popular tool to track the seasonality of tree canopy color. Yet how this technique can be used for the studies of ecosystem functioning is unclear. Yang et al. (2014) found that there is a mismatch between the canopy greenness and the leaf biochemical content such as chlorophyll concentration. While in the fall, the canopy redness can be used as an indicator of fall senescence.

For more information on his research and findings go to the MBL Blog or read about his work in the Vineyard Gazette and in his recent publication in the Journal of Geophysical Research: Biogeosciences.

Citation: Yang X, Tang J, Mustard J (2014) Beyond leaf color: comparing camera-based phenological metrics with leaf biochemical, biophysical and spectral properties throughout the growing season of a temperate deciduous forest. J. Geophys. Res. DOI:10.1002/2013JG002460