[Impacts of adaptive measures to climate changes on climatic potential productivity of maize in northeast China.].

To understand how would the maize production in northeast China adapt to climate change, we adopted two strategies, inclduing using stress resistant varieties and delayed sowing date, combined with the daily meteorological data of RCP4.5 scenario and RCP8.5 scenario from 2010 to 2099 simulated by regional climatic model, to analyze the changes of climatic potential productivity of maize under different climate change scenarios. The results showed that in 2010-2099, the spatial characteristics of climatic potential productivity of maize in northeast China decreased from southeast to northwest. The climatic potential productivity of maize under RCP4.5 scenario was higher than that under RCP8.5 scenario, while years with the lowest values under RCP8.5 scenario was more than that under RCP4.5 scenario. The climatic potential productivity for stress resistant varieties of maize was higher than the original varieties. Under RCP4.5 scenario, the heat resistant variety had higher productivity. Under RCP8.5 scenario, the drought resistant variety performed better. The variety with both heat and drought resistance characters achieved the highest productivity under both scenarios. Under RCP4.5 scenario, yield increased with postponed sowing, with 30-40 days delay achieving the highest yield. Under RCP8.5 scenario, yield reduction occurred in some areas. Such a result indicated that the appropriate delay in sowing is conducive to improve the maize productivity, with differences among regions.