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.
Vegetation growth curves in the three sampled sites in 2006 (A, Anduo; B, Qumalai; and C, Dangxiong) based on the GIMMS, SPOT-VGT, and MODIS NDVIs. The blue, red, and green straight lines show the retrieved vegetation SOS dates based on GIMMS, SPOT-VGT, and MODIS NDVIs, respectively. The NDVIs were averaged over a round area with a 5-km radius centered on each site. These dates are calculated by the SOS retrieval method (Materials and Methods).
