Characteristics of Climate Resources Distribution and Utilization during the Growth Period of Summer Maize in Huang-Huai-Hai Plain
In order to clarify the characteristics of climate resource distribution and utilization during the growth period of summer maize in Huang-Huai-Hai region,and improve the yield potential and utilization efficiency of climate resource,this study analyzed the relationship between high yield formation of summer maize and allocation of light,temperature and water resources in growing season using the data of six representative test sites in Huang-Huai-Hai area from 2017 to 2018.The results showed that there were significant differences in summer maize yield between years and regions,and the difference in yield was mainly due to the difference in 1000-kernel weight.The two-year yield and 1000-kernel weight of Ningjin test site were higher than those of other test sites about 6.42％-49.77％and 3.43％-38.34％,respectively.The difference of climatic resources was the main reason for the difference of summer maize yield between regions.The yield showed significantly or extremely significantly positive correlation with pre-flowering accumulated temperature,precipitation and precipitation during the whole growth period,and extremely significantly negative correlation with post-flowering accumulated temperature.That was,when the effective pre-flowering and post-flowering accumulated temperature did not exceed 878.3 ℃ and 726.6 ℃ respectively,increasing the pre-flowering rainfall within the range of 174-510 mm during the whole growth period precipitation was beneficial to obtain higher summer maize yield.The results showed that the accumulated temperature and rainfall distribution before and after flowering had greater influence on the yield formation than the total accumulated temperature and rainfall during the whole growth period.Therefore,optimizing the pre-flowering/post-flowering climate resource allocation and improving the matching degree between maize growth and climate resources could be taken as an important measure to mitigate the impact of climate change and further improve the yield of summer maize and the utilization efficiency of climate resources in Huang-Huai-Hai Plain.
NETL
NSTL
万方数据
