Table 1. Sample information of the 32 sampling sites.
| No. | Population | Prefecture | Coordinates | N | Altitude/m | SO/SD/° | Vegetation type |
| 1 | Caotangou | Maiji | E105°48′N34°21′ | 20 | 1 899 | SE70 | Shrub-grass |
| 2 | Tancaogou | Fengxian | E106°53′N34°6′ | 20 | 1 728 | SW45 | Shrub-grass |
| 3 | Chunshugou | Fengxian | E107°1′N34°2′ | 20 | 1 512 | SW65 | Shrub-grass |
| 4 | Hougou | Fengxian | E108°33′N33°55′ | 20 | 1 439 | N75 | Shrub-grass |
| 5 | Xiaoshagou | Taibai | E107°27′N34°1′ | 20 | 2 332 | NW60 | Forest-edge, Shrub-grass |
| 6 | Doumugong | Meixian | E107°43′N34°2′ | 20 | 2 748 | NW75 | Forest-edge, Shrub-grass |
| 7 | Pinganssi | Meixian | E107°43′N34°1′ | 20 | 2 815 | NW75 | Forest-edge, Shrub-grass |
| 8 | Mingxingsi | Meixian | E107°44′N34°0′ | 20 | 2 637 | E75 | Forest-edge, Shrub-grass |
| 9 | Xiabansi | Meixian | E107°47′N33°59′ | 20 | 2 883 | SE50 | Forest-edge, Shrub-grass |
| 10 | Laojungou | Liangdang | E106°33′N34°9′ | 20 | 1 902 | SE60 | Cliff, edge of forest |
| 11 | Youfanggou | Fengxian | E106°40′N34°12′ | 20 | 1 545 | SW70 | Shrub-grass |
| 12 | Baicaoling | Taibai | E107°24′N34°9′ | 20 | 1 373 | S60 | Forest-edge, Shrub-grass |
| 13 | Nianzigou | Zhouzhi | E108°6′N33°56′ | 20 | 1 821 | SW75 | Meadow, edge of forest |
| 14 | Wenjiagou | Zhouzhi | E108°5′N33°59′ | 20 | 1 765 | S80 | Meadow, edge of forest |
| 15 | Liulingou | Zhouzhi | E108°10′N33°52′ | 20 | 1 013 | NW75 | Meadow, edge of forest |
| 16 | Beigou | Zhouzhi | E108°16′N33°51′ | 20 | 1 579 | NW85 | Meadow, edge of forest |
| 17 | Dagangou | Huxian | E108°47′N33°55′ | 20 | 1 335 | NW65 | Shrub-grass |
| 18 | Yaowangmiao | Taibai | E107°31′N33°53′ | 20 | 1 779 | SE40 | Forest-edge, Shrub-grass |
| 19 | Yingpangoukou | Huxian | E108°34′N33°47′ | 20 | 1 487 | SE60 | Shrub-grass |
| 20 | Maiduoshigou | Liangdang | E106°7′N34°10′ | 20 | 1 520 | SE70 | Cliff, edge of forest |
| 21 | Panjiaba | Liangdang | E106°20′N34°10′ | 20 | 1 976 | SW45 | Cliff, edge of forest |
| 22 | Zhangjiagou | Fengxian | E107°5′N34°1′ | 20 | 1 469 | SW75 | Shrub-grass |
| 23 | Longwangmiao | Fengxian | E106°57′N33°55′ | 20 | 1 475 | SW75 | Shrub-grass |
| 24 | Huangbaigou | Fengxian | E106°59′N34°6′ | 20 | 1 745 | SW80 | Shrub-grass |
| 25 | Dashuiyugou | Maiji | E106°30′N34°18′ | 20 | 1 878 | W75 | Shrub-grass |
| 26 | Chenjiagou | Fengxian | E106°46′N34°13′ | 20 | 1 515 | SW45 | Shrub-grass |
| 27 | Longwangmiao | Maiji | E106°23′N34°15′ | 20 | 1 736 | NW60 | Shrub-grass |
| 28 | Yinmagou | Taibai | E107°11′N33°58′ | 20 | 2 252 | S60 | Forest-edge, Shrub-grass |
| 29 | Hualingou | Maiji | E106°17′N34°18′ | 20 | 1 793 | SW55 | Shrub-grass |
| 30 | Huojigou | Maiji | E106°2′N34°19′ | 20 | 1 718 | SE65 | Shrub-grass |
| 31 | Shijiagoucun | Maiji | E105°56′N34°25′ | 20 | 1 366 | SE60 | Shrub-grass |
| 32 | Liujiaping | Maiji | E105°44′N34°30′ | 20 | 1 690 | SW30 | Shrub-grass |
Note: N means sample size; SO/SD means slope orientation/degree.