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The map of the research area. The names of the villages are abbreviated: WTZ (Wangtouzhai), YSZ (Yangsanzhai), SJ (Shuijing), SH (Shuanghe), TZG (Tangzigou), PP (Pupiao), SQ (Shuangqiao), SMH (Shimuhe), LB (Luoban), SMK (Shanmenkou), HN (Huangni), PG (Pinggou), LSJ (Lengshuijing), LYJ (Liangyanjing), CGT (Cigutang), CPT (Changputang), DT (Datian), QML (Qimulin), HY (Hongyan), HT (Hetao), BS (Bingsai), MJ (Majie), and MJZ (Majiazhai).
