1. Administration CM (1993) Observation criterion of agricultural meteorology (in Chinese). China Meteorological Press, Beijing
2. Akaike H (1973) Information theory and an extension of the maximum likelihood principle. In: Petrov BN, Csaki F (eds) Proceedings of the Second International Symposium on Information Theory. Akademiai Kiado, Budapest, pp 267–281
3. Cannell MGR, Smith RI (1983) Thermal time, chill days and prediction of budburst in Picea-sitchensis. J Appl Ecol 20:951–963
4. Cannell MGR, Smith RI (1986) Climatic warming, spring budburst and forest damage on trees. J Appl Ecol 23:177–191
5. Chen XQ, Zhou M, Zheng T, Zhang RJ (2008) Examining seasonal variations of Leymus chinensis photosynthetic rates in the Hulunbeier Grassland: a case study of a grassland meteorological experiment station in Ewenke (in Chinese with English abstract). Acta Ecol Sin 28:2003–2012