烟草大田期叶片形状系数时空动态研究

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中图分类号：S572.01 文献标识码：A文章编号：1007-5119（2025）05-0028-07

Spatiotemporal Dynamics of Leaf Shape Coefficient of Tobacco During Field Period

YI Chunyu1，²， WANG Xiaolin1*，WU Tao³，FU Zhiwei³， SHI Yi1， ZHAO Min1， SUN Yanguo1， WU Furu³*， CAO Zheng³

（1.Tobacco Research InstituteofChinese AcademyofAgricultural Sciences/KeyLaboratoryofTobaco BiologyandProcesing，MinistryofAgriculture andRural Afairs，Qingdao266101，China; 2. Graduate SchoolofChineseAcademyof Agricultural Sciences， Beijing 10o081，China; 3.Liangshan Branch of Sichuan Tobacco Company， Xichang 615oo0， Sichuan， China）

Abstract： To investigate the temporal and spatial dynamics of the leaf shape coefficient （ a value） in field-grown tobacco， this study usedNicotianatabacumcv.Yunyan87astheexperimentalmaterial.Bymeasuringtheleaflength，leafwidth，andleafreauder different developmental stages （temporal factor）， planting densities，and leaf positions （spatial factors），the a values under various temporalandspatialconditionswerecalulatedtoclarifythecharacteristicsandunderlyingmechanismsofthetemporalandspatial dynamics in a values.Resultsshowed that planting density had no significant effecton a values，while itsinteractionwith leaf position exhibited significant effect.The average a values of different densities across leaf position showed a trend of decreaseincrease-decrease-increase with the days after transplanting.Over the whole growth period， the a valuesfor each leaf positionof Yunyan 87 fluctuated between 0.512and 0.860.Logisticmodel fitingresultssuggested thatthe inconsistent growthratesof leaf length and width might be the main cause of fluctuations of a values.Therefore，when calculating tobacco leaf area using a values， it isrecommended to incorporate the a values corresponding to different developmental stages and leaf positions into the formula to improve the accuracy of leaf area calculation.The a values for different developmental stages and leaf positions obtained in this study，along withtheproposed methods，provideabasisformoreacurateandconvenientleafareacalculations intobaco production.

Keywords： tobacco; leaf shape coefficient; leaf area calculation; spatiotemporal dynamics

烟草是典型的叶用作物，叶片面积是其产量和质量的重要指标，与水分蒸散、光能捕获等过程密切相关[1]，是光能利用效率和产量估算的重要参数[2-4]。（剩余10120字）