农牧交错带蒲公英春季物候期变化及其驱动气象因子

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中图分类号 S162 文献标识码A 文章编号 1007-7731（2025）16-0097-05

DOI号10.16377/j.cnki.issn1007-7731.2025.16.021

AbstractThe study took theagro-pastoral ecotone in Inner Mongolia as the researcharea and Taraxacum mongolicum Hand.-Mazzas the research object.Based on the phenological observation dataof dandelion （germinationperiod，leaf expansionintiationperiod，andleafexpansiopeak priod），meteorologicaldata （average temperatureandprecipitation，tc.） andsoil moisturecontentdatainthestudyareafroml98Oto2O18，lineartrendanalysisandpartialleastsquaresregression analysis wereused to explore the impactof climate change in the study area onthe phenologicalchanges of Taraxacum mongolicum Hand.-Mazz.in springandits maindriving meteorological factors.Theresultsrevealedasignificant warming and dryingtrendduring198O-2Ol8，withannualratesof change for meanairtemperature，precipitation，andsoil moisture content being 0.38°C/10 -0.68mm/10 a， and -0.004（m3/m3）/10 a， respectively. Correspondingly， Taraxacum mongolicum Hand.-Mazz.spring phenology showed consistent advancement trends： budburst advanced by 1.1d/10 a， initial leaf unfolding by 0.8d/10 a，and fulleaf expansionbyO.7d/1Oa.Theoptimaldurationforthe germination period，initial leaf-expansion period，andpeak leafexpansioperiodofdandelions （araxacumoficinale）is40，83，and8d，respectively.Partialleast squaresregressionanalysis showedthattheVIPvaluesofvarious meteorologicalfactors forthegerminationperiod were in the order of minimum temperature > average temperature > maximum temperature > soil moisture > precipitation; for the leaf expansion initiation period，the VIP values were in the order of soil moisture >minimum temperature ≡ average temperature > maximum temperature > precipitation; for the leaf expansion peak period， the VIP values were in the order of soil moisture > minimum temperature > average temperature > maximum temperature > precipitation. The R2 X（cum）， R2Y （20 （cum），andQcum）ofteegreiomodelrealgreatertanO.，idicaingagodfitigefft.Inonlusionvrage temperatureand soil moisture content were the main meteorological factors affecting thespring phenology of Taraxacum mongolicum Hand. Mazz.

Keywordsagro-pastoral ecotone; Taraxacum mongolicum Hand.-Maz;spring phenology;average temperature; soil moisturecontent

植物物候是植物受环境影响出现的以年为周期的自然现象，气候变化引起植被物候变化，物候变化调控植被对气候系统的反馈[-21。（剩余6960字）