This research was financially supported by grants from the National Key Project of Basic Research of China (Grant 2006CB403705), and the National Natural Science Foundation of China (Grants 40405001 and 40490261). The solar radiation and sunshine duration data used in this study were obtained from the CMA Meteorological Information Center, which is highly appreciated. The authors also thank Prof. Zhanqing Li from the University of Maryland and three anonymous reviewers for their help and suggestions.
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