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Shihezi University (石河子大学) 2021

Ecobiological Mechanism of Seeds Germinated in Autumn of Erodium Oxyrhynchum in Junggar Desert

杜佳倩

Titre : Ecobiological Mechanism of Seeds Germinated in Autumn of Erodium Oxyrhynchum in Junggar Desert

Auteur : 杜佳倩

Grade : Master 2021

Université : Shihezi University (石河子大学)

Résumé partiel
Winter annual plants are whose seeds germinate in autumn,which plays an important role in maintaining the diversity of desert areas and ecological functions such as windbreak and sand fixation.Especially with climate change,the coverage and density of winter annual plants are increasing,which plays an increasingly important role in the population.Therefore,it is great significance to study the formation mechanism of seeds germinated in autumn for further predicting desert vegetation dynamics under climate change and enriching winter annual plant seed germination strategies in temperate desert.We found that Erodium oxyrhynchum is the most common winter annual plant in Junggar desert.The existence of this species plays an important role in the stability and maintenance of desert ecosystem.Therefore,in this study,the dominant species germinated in autumn was selected.Combined with field investigation and indoor control experiment,the ecological and biological mechanism of seeds germinated in autumn was discussed from two aspects of ecological factors and biological factors,and whether seeds germinated in autumn is an important reason for the expansion and continuation of its population.The conclusions are as follows:First,important status of E.oxyrhynchum among species germinated in autumn in Junggar desertBased on the investigation of 14 sample plots in Junggar desert for two consecutive years,28 species germinated in autumn were found,accounting for 33.73% of the total species.Among them,the important value of E.oxyrhynchum was in the forefront of all species germinated in autumn,indicating that it occupied an important position in in species germinated in autumn.Second,the growth,survival and competition ability of plants germinated in autumn were significantly higher than that plants germinated in spring

Mots clés : winter annuals ;Erodium oxyrhynchum ;seed germination ;water change ;intraspecific competition ;interspecific competition ;

Présentation (CNKI)

Page publiée le 7 mars 2022