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.
Single effects of a gradient of defoliation, root reduction, and stem damage on diameter and height growth of Celtis occidentalis, Fraxinus pennsylvanica, and Tilia cordata. Error bars represent the standard error of the mean. Different letters represent significant mean differences between stress levels.
