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.
Pearson correlations between daily change in radial increment and climate parameters (relative air humidity, precipitation, mean air temperature) and xylem sap flow density at the timberline (a, filled circles), treeline (b, open circles) and krummholz-site (c, open triangles). Due to incomplete sap flow records at the treeline and krummholz-site, number of samples used in calculations was 82 and 124, respectively. *** p < 0.001; ** p < 0.01; * p < 0.05.
