8Wang Zhaohui, Liu Xuejun, Ju Xiaotang, et al. Ammonia volatilization loss from surface-broadcast urea: Comparison of vented-and closed-chamber methods and loss in winter wheat-summer maize rotation in North China Plain[J]. Commun Soil Sci Plan, 2004, 35(19/20): 2917-2939.
9Farquhar G D, Caemmerers S, Berry A. A biochemical model of photosynthetic CO2 assimilation in leaves of C3 species[J]. Planta, 1980, 149(1): 78-90.