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 abbreviations of study sites are as follows: LDU, Yuzhong campus of Lanzhou University in Lanzhou city; MJS, a site in the Xinglongshan forest in Majiasi; XLS, Xiaolongshan forest farm in Tianshui City.
