The roots of individual trees covered areas of 1.5 - 5 m2, and the underground depth of most of the roots was 10 - 40 cm. (sciencedaily.com)
Increased temperatures will have positive or negative effects on individual trees and forest - wide processes, depending on local site and stand conditions, but impacts from increased extreme heat will be negative. (montanaclimate.org)
Then there is the need to better understand the specific function of forests and even individual tree species. (scientificamerican.com)