Table 1 Geographic coordinates of the survey sites
Prefecture-level city | County | Latitude | Longitude |
|---|---|---|---|
Wuwei | Minqin | 38°37′39.36′′ | 103°5′32.2152′′ |
Tianzhu | 37°08′23.84′′ | 102°46′23.09′′ | |
Zhangye | Gaotai | 39°22′09′′ | 99°48′49′′ |
Baiyin | Jingyuan | 36°34′48′′ | 104°36′36′′ |
Pingchuan | 36°43′39′′ | 104°49′30′′ | |
Linxia | Hezheng | 35°25′29′′ | 103°21′04′′ |
Jiuquan |  | 39°43′56.9568′′ | 98°29′39.8796′′ |