Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relationship of root respiration with root age. All original data from the two experiments are fitted to a single power equation. Points on the X-axis represent the middle age of each age class. There was no significant (P > 0.05) effect of N supply or experimental condition (greenhouse vs field) on the relationships of root respiration with root age (see Table S1 available as Supplementary Data at Tree Physiology Online).
