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Université de Mongolie-Intérieure (2020)

Soil Microbial Diversity in Rhizosphere of Three Stipa Species with Substituted Distribution in Central and Eastern Steppe of Inner Mongolia

楠极;

Titre : Soil Microbial Diversity in Rhizosphere of Three Stipa Species with Substituted Distribution in Central and Eastern Steppe of Inner Mongolia

Auteur : 楠极;

Grade : Doctoral Dissertation 2020

Université : Université de Mongolie-Intérieure

Résumé partiel
Stipa baicalensis,Stipa grandis and Stipa krylovii steppes are unique zonal steppe groups in central Asia.The populations of S.baicalensis,S.grandis and S.krylovii present a horizontal substituted distribution with the precipitation and temperature gradients gradually decreased from east to west in Hulunbuir and Xilingol of Inner Mongolia steppes.In this study,plant diversity,soil physicochemical properties,soil enzymes,and soil microorganisms(AM fungi)diversity were studied using high-throughput sequencing in two transects from Hulunbuir to Xilingol(including six plots of three Stipa species)were selected,and the diversity and evolution of soil microorganisms(AM fungi)under the substituted distribution of Stipa communities were explored.The main research results are as follows :(1)A total of 23 families,48 genera and 73 species of angiosperms were found in the plant community of Stipa steppe.The majority of the families were Gramineae,Liliaceae,Compositae,Leguminosae and Cyperacea.The shannon indices were1.40-2.27,the simpson indices were 0.61-0.86,and evenness indices were 0.58-0.83,the diversity of plant communities is not significant.The heights of Stipa were17-59.3 cm,the biomasses of Stipa were 30.5-180.2 g,the relative abundances of Stipa were 5.92-40.86%,the relative coverages of Stipa were 30.04-66.84%,the relative frequencies of Stipa were 6.25-12.5%,the importance values of Stipa were16.84-38.74%,The heights of Stipa,the biomasses of Stipa and importance values are significantly different among plots.The plant community of Stipa steppe changed significantly from S.baicalensis to S.krylovii.The types and number of plants decreased,and non-drought tolerant and non-saline tolerant plants were gradually replaced by drought-tolerant and saline-tolerant plants.(2)Based on the results of high-throughput sequencing,the number of OTUs for AM fungi in the endosphere and rhizosphere soil were 137 and 159,respectively.A total of 42 species belonging to 6 genera in the endosphere and 45 species belonging to 6 genera in the rhizosphere soil were annotated,belong to Glomus,Diversispora,Paraglomus,unclassifiedcGlomeromycetes,Scutellospora,Ambispora,respectively.Glomus was the dominant genus.The AM fungal community changed significantly from S.baicalensis to S.krylovii,and the species and quantity decreased.

Mots clés : central and eastern steppe; Stipa population; AM fungi; soil microorganisms; high-throughput sequence;

Présentation (CNKI)

Page publiée le 23 octobre 2020, mise à jour le 26 octobre 2021