The study investigates how environmental factors like meteorological conditions, soil water content, and canopy structure affect tree sap flow in a specific area of the Liupan Mountains from June to September 2019.
Researchers found that the sap flow rate is influenced by potential evapotranspiration (PET), relative extract water (REW), and canopy leaf area index (LAI) in varying degrees, leading to different response patterns for each factor.
A model was developed to predict sap flow by considering the interactions among PET, REW, and LAI, revealing that PET is the most significant factor, particularly varying greatly between sunny, cloudy, and rainy days.