Abstract: Agricultural cultivation region in China is sensitive to global climate change. The sensitivity of various soil types to warming plays a key role in the relationship between agricultural production and air warming. To reveal the response of soybean yield to air warming, the present study was to study the effect of 2℃ warming on soybean yield in Black soil, Brown soil, Saline-alkali soil, Aeolian soil, Sierozem, Loess, Yellow-brown soil, Purple soil, Shajiang black soil, Fluvo-aquic soil, Red soil, Latosol soil under mimic 2℃ warming with Infrared radiation heating device compared to normal temperature as control. The results showed that 2℃ warming increased the numbers of one-seed, two-seed, three-seed and total pods by 152.3%, 144.7%, 206.9% and 147.5% compared to control, respectively. However, 2℃ warming increased the number of shrunken pods in Shajiang black soil by 42.8% compared to control. Apart of the increase in the numbers of two-seed in Latosol soil and total pods in Purple soil by 76.4% and 50.5%, 2℃ warming did not significantly impact pod number in other soil types. Moreover, 2℃ warming significantly increased the seed number per plant in Red soil, Shajiang black soil, Purple soil and Saline-alkali soil, and their yields increased by 241.4%, 59.2%, 47.6% and 75.2% accordingly. Taken together, soybean yield and its components in Red soil, Shajiang black soil, Purple soil and Saline-alkali soil were sensitive and positive to 2℃ warming, while other 8 soil types were insensitive to 2℃ warming. All these indicated that soybean yield formation in response to air warming was indirectly regulated by soil types. This result might provide theory evidence for adapting future climate change in different soil type regions.

Key words: Climate change, Soybean, Yield component, Soil type