辽西地区大豆生长发育和产量对气候变化的响应OACSTPCD

Based on years of phenological monitoring and phased sowing experimental data,the response of soybean growth,development and yield to climate change in western Liaoning province was studied.The results showed that the lower limit temperature for soybean sowing is 8.0℃,and the optimum temperature is 15～20℃.The appropriate soil moisture is between 18％and 22％,and the ideal sowing period is in early to mid-May.The soybean vegetative growth phase requires a cumulative temperature of≥10℃ over 1200℃·d,the reproductive growth phase over 1250℃·d,and the entire growth period over 2600℃·d.The relationship between cumulative temperature and yield is parabolic,and the cumulative temperature of≥10℃ 2800～3060℃·d is conducive to the increase of soybean yield.There are three critical temperature periods for soybeans:branching(early to mid-June),flowering and pod setting(mid to late July),and grain filling(mid to late August).Drought during the vegetative growth phase reduces 100-grain weight by 6.0％～18.0％,and during flowering,pod setting,and maturation,it reduces by 8.0％～25.0％.The impact of rainfall on soybean yield is parabolic,and the critical period for water needs is from early June to mid-August.Light has no significant effect on soybean yield in western Liaoning.