水曲柳雌雄株吸收根生物量与形态结构的季节动态

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中图分类号：S721 文献标志码：A 文章编号：1000-2006（2026）02-0149-09

Abstract：【Objective】This studyaimsto clarifytherelationship betweenabsorptiverootdevelopmentandreproductive proceses indioecious Fraxinus mandshurica，investigate genderdimorphisminrottraits，and provide insights forsexspecific nutrient management strategies.【Method】 Using mature female and male F .mandshurica trees，fine root samples （orders 1-3）were collected across the growing season （April-August） via soil coring. Root biomass，morphology， anatomical structure，and mycorrhizalinfectionratewereanalyzedusing rooscanningandparaffnsectioning techniques. 【Result】Absorptive root biomass increased seasonallinboth sexes.Beforemale flowering，root biomass was similar between genders.From male flowering to female flowering，male root biomass increased by 33.14% ，whilefemale biomassremained unchanged.During seed development，both sexes exhibited marked increases inroot biomass-females by 481.63% and males by 393.90% （ P <0.05）.Root length density was consistently higher in males，with the 1st-order rootlength densitybeing 2.27times greater inmales atseed maturity.Gender-specificseasonal paterns wereobserved in root diameter，with male1st-order roots being 21.80% （June）and 15.52% （August）thicker than females（ P<0.05 ） Anatomical analysis revealed that this was due to greater cortical thickness in males（ 11.57% and 7.73% higher in June and August，respectively; P<0.05 ），while vascular bundle diameter did not differ.Mycorrhizal infection rate was also higher inmales（by 4.45% in June and 3.84% inAugust）.【Conclusion】Seasonal dynamics of absorptive root biomass in F.mandshuricaareclosely linked toreproductivephenology.Malesexhibited earlierroot developmentandmaintained higher absorptiveroot biomass throughout the growing season.Theobservedgender diferences inroot morphology， anatomyand mycorrhizal asociation highlight distinct belowground strategies between femaleand male trees.

Keywords： Fraxinusmandshurica； dioecy；absorptive root；root biomass；rootmorphology；rootanatomy; seasonal dynamics

雌雄异株植物不同性别间营养和生殖器官在形态、结构及生理活动等方面存在差异，即性别二态性[1]。（剩余17021字）