農(nóng)牧交錯(cuò)帶蒲公英春季物候期變化及其驅(qū)動(dòng)氣象因子

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中圖分類(lèi)號(hào) S162 文獻(xiàn)標(biāo)識(shí)碼A 文章編號(hào) 1007-7731（2025）16-0097-05

DOI號(hào)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

植物物候是植物受環(huán)境影響出現(xiàn)的以年為周期的自然現(xiàn)象，氣候變化引起植被物候變化，物候變化調(diào)控植被對(duì)氣候系統(tǒng)的反饋[-21。（剩余6960字）