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.
Leaf area index (LAI) over three years (a) and vegetation cover in 2014 (b). The panel inset in (b) shows the difference in vegetation cover (Δcover) between the N-addition (N, empty circle) and the control (CK, solid circle) treatments in 2014. LAI was derived from normalized difference vegetation index (NDVI) data from the Moderate Resolution Imaging Spectroradiometer (8-d time resolution and 250-m spatial resolution).
