国家自然科学基金重点项目批准号:41430102资助.Funding for field works during the past 20 years was provided by:Chinese National Natural Science Foundation No.41430102,Strategic Priority Research Program of the Chinese Academy of Science XDB03020104,Chinese Academy of Science Outstanding Overseas Scholar Fund KL205208,National Science Foundation US EAR-0446699,0444073,0958704,1227212 to XW,and National Geographic Society NGS5527-95 to XW.