Variation Characteristics of Ground Temperature from 0 to 20cm in Bozhou Area and Its Correlation with Rapeseed Yield
Based on the monthly 0～20 cm ground temperature observation data and agrometeorological observation data from September 1982 to May 2022,the variation characteristics of ground temperature from 0 to 20 cm during rapeseed growing period and its correlation with rapeseed yield were analyzed by climate tendency rate method,Mann-Kendall test,Morlet wavelet analysis and linear regression analysis methods.The results showed that the ground temperature in 0-20 cm soil layers showed an increasing trend during the growth period of rapeseed in Bozhou from 1983 to 2022.The ground temperature of 0 cm,15 cm and 20 cm had no obvious mutation characteristics,while the average ground temperature of 5 cm and 10 cm had an abrupt change in 1997,and the trend of increasing was much more obvious after that.The periodicity of ground temperature in all soil layers was the best on 32 years scale,and there were three alternating periods in the past 40 years on that scale.The average ground temperature in 0-10 cm soil layers in February,0-20 cm soil layers in March and April were significantly positively correlated with rape yield,and the correlation coefficient between 20 cm ground temperature in April and rape yield was the largest.
Ground temperatureClimate tendency rateAbrupt change of climateCorrelation analysis
万方数据
