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Beijing Forestry University (2020)

Soil Microbial Communities and Their Effects on Carbon and Nitrogen Processes in Typical Sand-fixing Shrublands

孙延菲

Titre : Soil Microbial Communities and Their Effects on Carbon and Nitrogen Processes in Typical Sand-fixing Shrublands

Auteur : 孙延菲;

Grade : Doctoral Dissertation 2020

Université : Beijing Forestry University

Résumé partiel
Soil microorganisms,as the core of soil ecosystem,are closely related to a range of ecosystem processes.They directly affect formation and maintenance of soil fertility and fuction of ecosystem.In the plant-soil system,plants tend to select specific soil microbial community composition to affect microbial functions.In semiarid and arid areas of China,revegetation with xerophilous shrubs is an effective measure for controlling desertification.Although many studies have evaluated effects of shrublands on soil properties and microclimate,information about soil microbial community and their functions still remains unclear.In this study,we investigated the activity and composition of soil microbial community,and illustrate the roles of soil microbes on soil organic carbon(SOC)accumulation and soil nitrogen(N)transformation,in three revegetation shrublands(Artemisia ordosica,Salix psammophila,and Caragana microphylla),using high-throuhput sequencing techolody,stable isotope tracing techolody,and laboratory analysis.The main results and conclusions are as follows :(1)The soil enzyme activity,microbial biomass,and microbial divisity were higher in the three shrublands than that in bare sandland.In the three shrublands,soil collected in the A.ordosica shrubland exhibited the highest microbial enzyme activity and biomass.The bacterial diversity was higher in the A.ordosica than that in the S.psammophila and C.microphylla shrublands,and the fungal diversity was higher in the A.ordosica and C.microphylla shrublands.

Mots clés : https://eng.oversea.cnki.net/kcms/d...

Présentation (CNKI)

Page publiée le 5 juin 2021