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.
The axial distribution of xylem sapwood and phloem cross-sectional area (A), nitrogen content (B) and hydraulic conductivity in a 10-m tree (C). Values are expressed in relation to tree base in each case. “sw = 2 cm” refers to a scenario where maximum sapwood depth was assumed to be 2 cm, and “no hw” refers to a scenario of no heartwood formation, i.e., all of the xylem was assumed to be conducting.
