7Tubiello F N, Soussana J, Howden S M. Crop and pasture response to climate change. Proceedings of the National Academy of Sciences, 2007,104(50) :19686 -19690
8Xiao G J, Liu W X, Xu Q, et al. Effects of temperature increase and elevated CO2 concentration, with supplemental irrigation on rain-fed spring-wheat yield in semiarid areas of China. Agricultural Water Management ,2005,74:243 - 255
9Amthor J S. Perspective on the relative insignificance of increasing atmospheric CO2 concentration to crop yield. Field Crops Research, 1998,58 : 109-127
10Kimball B A, Kobayashi K, Bindi M. Responses of agricultural crops to free-air CO2 enrichment. Advances in Agronomy ,2002,77:293-368