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Ningxia University (2022)

Study on the Feedbacks of Halophytes and Microorganisms in Desert Steppe


Titre : Study on the Feedbacks of Halophytes and Microorganisms in Desert Steppe

Auteur : 潘雅清

Grade : Doctoral Dissertation 2022

Université : Ningxia University

Résumé partiel
As a transition zone between grassland and desert and an important ecological barrier,desert steppe is extremely sensitive to climate change and human activities,with scarce and high variability of precipitation,and extremely weak in soil leaching process,which leads to the obvious and widespread phenomenon of salt surface aggregation.The colonization of halophytes makes it possible to stabilize and restore the ecosystem.Halophytes are widely distributed in the desert steppe ecosystem and can resist stress through the characteristics of dilute salt,salt secretion and salt rejection.However,previous studies have focused on the physiological characteristics and molecular mechanisms of halophyte under stress,and lack of systematic research on plant-microbe interaction in halophytes.Nowadays,balancing the services and functions of desert steppe ecosystems has become a complex and challenging task.However,the maintenance strategy of endophytic microbial communities among different tissues of halophytes and the environmental factors driving the composition process of rhizosphere and phyllosphere microbial communities,the influence mechanism of halophyte litter input and root exudates on soil microbial communities,and the mechanism of halophytes feeding back the multi-function of soil ecosystem are lack of systematic and in-depth research.In view of this,we investigated the halophytes such as Kalidium cuspidatum,Nitraria tangutorum,Reaumuria songarica and Tamarix chinensis,the typical halophytes in Ordos desert steppe.And carried out field plot community investigation,Uav image analysis,laboratory control experiment,plant and soil physicochemical properties,microbial high-throughput sequencing and non-target metabolomics analysis.Combined with machine language,we systematically and comprehensively studied the microbial community structure and diversity,the network relationship between microorganisms and the regulation pathways of multi-factors on ecosystem versatility under the interaction of halophytes and microorganisms in desert steppe

Mots clés : desert steppe ;halophyte;microbe ;environmental change ;land use ;ecosystem multifunctionality ;

Présentation (CNKI)

Page publiée le 16 octobre 2022