Reactive dynamics of soil moisture in late-ripening citrus orchards in Meishan City and their responses to varying precipitation levels
Based on the hourly observation data of soil moisture in the late-ripening citrus smart meteorological digital test base in Meishan City from June to September in 2023,this study analyzed the spatio-temporal dynamic changes of soil moisture in each layer of 0～40 cm and its response to different magnitudes of rainfall,determined the response threshold of soil moisture in each layer,and established a logarithmic model of rainfall and soil moisture increment.The results showed that soil moisture increased firstly with soil depth of 10～20 cm,then decreased with soil depth of 20～30 cm,and then increased with soil depth of 30～40 cm.The thresholds of rainfall response in 10 cm,20 cm,and 30～40 cm layers were 4 mm,12 mm,and 20 mm respectively,and the rainfall events of heavy rain and above would obviously respond to soil moisture in each layer of 0～40 cm.Correlation analysis showed that rainfall was highly correlated with soil moisture in each layer of 0～40 cm,and the correlation coefficients of logarithmic functions of the four observation layers ranged from 0.436 to 0.585(R2>0.4).The results of this study can provide technical support for the high-quality growth and water-saving irrigation of late-ripening citrus.
万方数据
维普
