Analysis of daily temperature change characteristics and canopy mixing patterns in urban forests
The aim of this study is to determine the daily temperature changes of forest canopy temperature in three types of evergreen broad-leaved forest(EBF),deciduous broad-leaved forest(DBF),and evergreen deciduous broad-leaved forest(MBF)in Harbin,Heilongjiang Province,and to study the canopy structural characteristics that affect temperature changes,as well as a comparison of canopy filling methods and canopy morphology.The research results show that the daily temperature order of the three forest types is MBF>DBF>EBF.Among the daily temperature trends,the thermal environment of DBF fluctuates greatly,while the thermal environment of EBF and MBF is relatively stable.Due to the"mixed effect",MBF has a larger crown volume and surface area compared to DBF and EBF,with higher canopy filling and better light utilization efficiency.The canopy area,canopy volume,growth space competition index,growth competition index,tree species diversity,leaf area,DBH,and tree height significantly affect the forest thermal environment and cooling effect.The research results provide important references for the design of future urban thermal comfort landscapes.
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