The authors acknowledge Jianfeng Peng, Yongxiang Zhang, Yong Zhang, Qinghua Tian, Tao Yang, and other persons for their kind help in the field and in the lab. We are grateful to Fritz Schweingruber, Gordon Jacoby, Paul Sheppard, Qibing Zhang, Xuemei Shao, Neil Pederson, and other scientists who have contributed their tree-ring data in the study region to the publicly available database. We appreciate the helpful comments from Peregrine Gerard-Little and two anonymous reviewers. This research was supported by the National Basic Research Program of China (973 Program) (2009CB421306), the National Science Foundation of China (40971119 and 41001115), the NSFC Innovation Team Project (41021091), and the Chinese 111 Project (B06026).
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