Characteristics Analysis of Droughts for Maize in Liaoning Province Based on SPEI
In the context of global warming,frequent drought events have hit regional agricultural production hard.Exploring the climate change and drought characteristics of maize during the growth period will help prevent the direct damage caused by drought and other disasters to maize.Based on the daily observation data of 24 national meteorological stations in Liaoning Province from 1961 to 2020,the SPEI at different growth stages in Liaoning Province was quantitatively evaluated and comprehensively analyzed according to the calculation of SPEI,based on the Mann-Kendall method,wavelet analysis method,and gray correlation analysis method.The results showed that the overall trend of precipitation in the past 60 years was not significant from the perspective of the whole growth period of maize,but was significantly positively correlated with SPEI.The average temperature of maize during the growing period was negatively correlated with SPEI.The SPEI of maize showed an upward trend in time during the whole growth period.On the whole,there was no global drought during the growth period of maize in Liaoning Province in terms of drought station ratio.
SPEIdrought station ratioLiaoning Provincemaizemeteorological drought
NETL
NSTL
万方数据
