锌胁迫对2个白花泡桐株系生长及光合生理的影响

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中图分类号：S792.43 文献标识码：A 文章编号：1006-060X（2025）11-0043-09

Abstract：Thisstudy aims toscreenout the tree materials suitable for ecological remediationof zinc（ Zn） -contaminatedareas.Two geographic strains （P-35-1andP-35-15）ofPaulownia fortunei（Seem.）Hemsl.wereusedforpot experiments with simulated Zn stressgradients（0，326.5，653.0，and 979.5mg/kg ）.Thetwo strainswere compared in termsof growth，photosynthesis，and biomass allocationcharacteristics.The resultsshowed that Zn stresssignificantlyinhibited the growthofboth strains.P-35-1 exhibited stronger tolerance to Zn stress，with the biomass of 38.5% undermoderate Zn 0 653.0mg/kg stress，whileP-35-15wasmore sensitive to Zn stress.Under low-concentration （326.5mg/kg ）Znstress，P-35-1 showed significantly increased chlorophyllcontent，while P-35- 15demonstrated declined chlorophyll content as the Zn concentration increased.Under low-concentration Zn stress，P-35-1 showed enhanced maximumnetphotosyntheticrateandlightuseeficiency，anditdemonstrated impaired photosynthesisandlowered light compensation point under moderate- and high-concentration Zn stress.P-35-15 showed significantly reduced maximum net photosynteticateadtsturatiopotuderalltrseelsithpoosthiseingonsistentlyied.Imaryadapted to low-moderate Zn polution through photosynthetic regulation （stimulation under low stress and tolerance under moderate stre）.Teaidgrowthaddeprootsof-35-1glgtitssuitabitforecologicalrehabiltatonofsopeswithildooerate Zn pollution in the typical mining areas in Guangxi.

KeyWords：Paulownia fortunei; zinc stress;photosynthesis; biomassallocation

随着锌（Zn）矿资源的大规模开采与冶炼，矿区及周边环境面临着严重的土壤重金属污染[]。（剩余11700字）