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Northwest Normal University (2021)

Effect of Controlled Precipitation on Soil Bacterial Community in Desert Steppe of Western Loess Plateau

王军锋

Titre : Effect of Controlled Precipitation on Soil Bacterial Community in Desert Steppe of Western Loess Plateau

Auteur : 王军锋

Grade : Master 2021

Université : Northwest Normal University

Résumé partiel
In the context of climate change,the global and regional precipitation patterns will change.Precipitation is an important source of water in arid and semi-arid ecosystems and a key driver of biological processes at different spatial and temporal scales.As the main driver of earth material circulation,soil bacterial community has not been clearly understood due to its complex structure and the limitations of research methods and research scales.Desert steppe in the western Loess Plateau,as a typical transitional vegetation type between steppe and desert,plays an important role in maintaining the stability of regional ecosystem.However,because of the semi-arid area,the vegetation is sparse and the soil erosion is serious,so the ecosystem is very fragile.Therefore,the study on the effect of precipitation change on soil bacterial community in desert steppe on the western Loess Plateau can provide data support for evaluating the response mechanism of soil carbon pool dynamics to precipitation change in desert steppe,and provide theoretical basis for the management of desert steppe ecosystem.This study used in the field distribution of the loess plateau in the western desert grassland precipitation controlled trial,set up five precipitation gradients(precipitation reducing 40%,precipitation reducing 20%,contrast,add precipitation 20%,add precipitation 40%),using high-throughput sequencing technologies to determine the species composition and diversity of soil microbial communities,the integrated use of analysis of variance,Kruskal-Walli test,LEf Se multistage species difference discriminant analysis,Spearman correlation analysis and structural equation model analysis methods,to study the effects of precipitation change on desert grassland soil bacterial community composition,diversity,plants and soil characteristics and its mechanism.

Mots clés : Control precipitation ;Desert steppe ;Soil bacterial community ;Soil property ;Plant community ;

Présentation (CNKI)

Page publiée le 26 février 2022