不同光照条件下顶花板凳果的光合特性变化及耐阴性评价

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中图分类号：S751.1 文献标志码：A 文章编号：1000-2006（2025）06-0162-09

Abstract：【Objective】This study aims to explore the efects of shading intensity on morphological characteristics， physiologicalindices，photosyntheticparameters，andchlorophyllfluorescenceparametersofPachysandraterminalis.It provides a theoretical basis for the application of P .terminalisinlandscaping.【Method】TakingP.terminalisasthe experimental material，four light conditions were set up： full light（control group，CK）， 30% shading，65 % shading， and 85 % shading. Measurements were taken on its morphological characteristics，physiological indices，photosynthetic parameters，and chlorophyll fluorescence parameters.Theshade tolerancewas comprehensivelyevaluated through principal component analysis and the membership functionmethod.【Result】With the increase of shading intensity，the chlorophyll content，maximal quantumyield，PSIactivity，electron transport rateand photochemical quenching coeffcient allshowedanincreasingtrend.Leaf thickness，leaf area，crown width，specific leaf area，leaf watercontent， andrelativeconductivityshowedaninitial increase followed byadecrease.Inallshading treatment groups，leaf length， leaf width，initialfluorescence，andnon-photochemicalquenching coeficient weresignificantlylower thanthose in the control group. Under the 65% shading condition，the apparent quantum yield reached its maximum value，the maximum net photosyntheticratewassignificantlyhigher than thatinother treatmentgroups，while the lightcompensationpoint reached itsminimum value.Additionaly，the lightsaturation point increased significantlycompared to the control group. 【Conclusion】P.terminalis isa shade-tolerant plant.Mild shading can promote its growth and development，with 65% （20 shading being optimal.

Keywords：Pachysandraterminalis；shadetolerance；morphologicalcharacteristics；physiological characteristics; photosynthetic parameter；chlorophyll fluorescence paraments

随着城市化进程加速，建筑密度攀升，导致绿地光资源锐减，林冠郁闭区、建筑物阴面等荫蔽生境占比显著增加[1-2]。（剩余18423字）