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Inner Mongolia University (2022)

Plant and Soil Microorganism Interaction during the Vegetation Succession and Restoration in Kubuqi Desert

于洁

Titre : Plant and Soil Microorganism Interaction during the Vegetation Succession and Restoration in Kubuqi Desert

Auteur : 于洁

Grade : Doctoral Dissertation 2022

Université : Inner Mongolia University

Résumé partiel
Desertification is a pressing problem caused by climate change such as precipitation pattern change and warming,as well as human activities such as overgrazing and over-cultivation,especially for the arid and semi-arid regions.Many studies have showed that aboveground and belowground communities are closely linked in terrestrial ecosystem.However,the relationship between plant and soil microbial communities are still unclear in the process of vegetation succession and restoration in sandy land.The plant-soil microorganism interactions play an important role in ecosystem process and functions.Plants not only can provide carbon sources for microbial growth,but also change soil property and soil environment,and influence the microbial community.Vice versa,soil microbial communities not only can provide nutrients for plant growth,but also build symbiotic,parasitic and antagonistic relationships with plants,and influence the plant performance and community structure.We collected the soil samples in three successional stages in natural vegetation succession experiment which plant community were dominated by Artemisia ordosica,as well as other two plant communities were dominated by Caragana microphylla or Hedysarum laeve in artificial vegetation restoration experiment,located in natural agricultural microbiology Ordos experimental station.We analyzed the soil properties and soil microbial diversity and community structure,explored the determinants of microbial community in natural vegetation succession and artificial vegetation restoration experiments.In addition,we also conducted a laboratory experiment to explore the effects of microbial community on seedlings of three above plants(A.ordosica,C.microphylla and H.laeve).Our results illustrated the plant-soil microorganism interaction in natural vegetation succession and artificial vegetation restoration in sandy ecosystem.The main results as follows:1.Bacterial and fungal Shannon index were no influenced by successional stages and patch types,but the responses of bacterial and fungal OUT richness were increased with successional stages and patch types with the succession process of A ordosica community.In addition,bacterial and fungal β-diversity were affected by successional stages and patch types,driven by the change in SOC and soil p H.The bacterial and fungal community compositions also affected by successional stages and patch types,and the soil microbial communities shifted from oligotrophic to copiotrophic.2.In artificial vegetation restoration,shrubs increased bacterial and fungal alphadiversity,especially for the bacterial Shannon index and fungal OUT richness.Bacterial and fungal β-diversity were influenced by plant species,and this was mostly related to the plant-induced change in soil nutrient and soil p H.In addition,plant species also affected the relative abundance of specific bacterial phyla and fungal classes.The relative abundance of Actinobacteriota was rich beneath shrub canopies of C.microphylla and H.laeve,and the relative abundance of Acidobacteriota was harbored in the under-canopy of A.ordosica.

Mots clés : Artemisia ordosica ;community succession ;Caragana microphylla ;Hedysarum laeve ;soil microorganism ;plant-soil microorganism interaction ;

Présentation (CNKI)

Page publiée le 15 octobre 2022