湿地松光系统对早春低温的动态响应

打开文本图片集

中图分类号：S718.43 文献标志码：A 文章编号：2096-9902（2026）06-0030-05

Abstract：ThisstudyasesedthephysiologicalresponsemechanismofPinuselitiitoearlyspringlowtemperaturestress inthecontextofglobalclimatechange.Basedonyearsof meteorologicaldata，naturallowtemperatureconditionsweresiulated， high（H），medium（M）intensityandcontrolcheck（CK）treatmentswereset，andthedynamicchangesofphysiologicalparameters duringte5-daystressproesswereanalyed.Theresultsshowedthatundershort-termhighintensitystress，non-photohemical quenchingandthemaximumphotochemicaleficiencyofPSIsignificantlyincreased，andthephotoprotectionmechanismwas rapidlyactivated;whilelong-termstressledtoadecreaseinchlorophyllacontent，anincreaseininitialfluorescence，and irreversibledamagetothephotosystem.Undermoderatestressplantscouldtemporarilymaintainsomefunctionsthroughheat dissipation，but the maximum photochemical efficiency of Ps I still decreased with time.This study provides a theoretical basis foranalyzing the mechanism of subtropical evergreen tree species coping with spring low temperatures.

Keywords：lowmpeaturest;loroyllfureseeprameer;inusi;lightroteion;ogicaldtability

在全球气候变化背景下，极端温度事件频发，已成为影响森林生态系统结构与功能的关键因素。（剩余8288字）