[Objective]Trunk sap flow is an important physiological indicator for the study of plant transpira-tion water consumption,and both tree species and meteorological factors are key influencing factors.This study aims to remove the limitation of tree species factor and explore the relationship between tree trunk sap flow and meteorological factors.[Method]Based on ten tree species in 3 forest stands in the water source area of Hani Terraces,their trunk sap flow rates were measured by using thermal dissipation probe(TDP)technology,and the relationship between synchronized data and meteorological factors were ana-lyzed.[Result]Seven abnormal synchrony data were found from 7 779 tree trunk sap flow rate data in secondary deciduous broadleaf and primary evergreen broadleaf forests,and these abnormal synchrony data showed synchronous consistency across tree species;Further correlation analysis showed that the sudden increase in solar radiation was the main cause of the synchronous increase in sap flow rate,while rainfall was the main cause of the synchronous decrease in sap flow rate,and changes in both could lead to changes in other meteorological factors,which could affect the trunk sap flow rate;There was a certain time lag effect between tree trunk sap flow and meteorological factors:under abnormal climate conditions,sap flow lagged solar radiation by 0～30 min and was ahead of saturated water vapor pressure difference,with air temperature and humidity of 0～60 min,and the lag or advance time was much smaller than the time of each tree species under normal climatic conditions.[Conclusion]Tree trunk sap flow is regulated by a combination of meteorological factors such as solar radiation or rainfall,with solar radiation having the most pronounced effect.The paper may provide a scientific basis for studying the relationship between transpiration and meteorological factors in trees at the physiological-ecological level.
Trunk sap flowmeteorological factorrelationship analysisabnormal synchronytime-lag effect
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