et al., 2011), and higher C concentration of bark of boreal tree species
may also relate to the role of bark in fire resistance (Hengst
and Dawson, 1994).
Our data yielded mixed results for tree size effects on total C
concentration of bark and stemwood. We found both neutral and
positive relationships between tree size and total C concentration
of stemwood, partially in agreement with Martin and Thomas
(2013) whose study in tropical forest found C concentration
increases with tree size. In addition, we also found negative,
neutral, and positive relationships between tree size and total C