Received: 27 November 2017
Accepted: 26 January 2018
First Online: 7 March 2018
: Yude Pan is a senior research scientist of the USDA Forest Service Northern Research Station. She is also a senior investigator at Harvard Forest of Harvard University, Subject Matter Editor for Ecological Applications, Ecosphere, and Associate Editor for JGR-Biogeosciences; Kevin McCullough is a geographer and GIS specialist in the same research unit; David Y. Hollinger is a senior scientist and the Project Leader for the unit of Climate, Fire, and Carbon Cycle Sciences of the USDA Forest Service Northern Research Station.
: The authors declare that they have no competing interests.