简介:Inordertoprobethedeathreasonofterminalbudsandcarryouttrunkextensionbyusinglateralbuds,thetemperaturecharacteristicsofdormancydevelopmentofterminalandlateralbudsinPaulowniatomentosaxp.fortunei33wereinvestigatedbyraisingcuttingbranchesondifferentdateat25℃and15℃.Theresultswereasfollows:①Thedeathreasonofterminalbudsandthefirstpairoflateralbudswasitselfecologicaladaptingstrategy,nottheinjuryofearlyfrostandfreezing;②Thelateralbuds2,3and4hadobtainedthefeatureofwinterdormancy,andcouldsurvivefromcoldwinter,andwidenitspossibletemperaturerangeofsproutingtolowertemperaturebyexperiencingwinterchilling;③Thelateralbuds2,3and4couldsproutatthesametimeinspring,butitwasdifficulttosproutforotherlateralbuds;④Thesproutingofupperlateralbudscouldrestrictthesproutingoflowerlateralbudsat25℃,butnotat15℃.