Elinor Fajer, Harvard University, and Peter Pellitier, University of Utah, discuss their article: Ectomycorrhizal communities underlie trade-offs between greater long-term tree growth and reduced soil carbon concentrations in boreal forests Boreal forests are one of the most carbon-rich ecosystems on Earth. Belowground, the soils store massive amounts of carbon-rich organic matter, and aboveground, long-living trees…