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Université de Shihezi (2020)

Studies on Quantitative Characteristics of AMF in Grazing Grassland of Seriphidium Desert and Its Growth-promoting Effects on Host Plants

李娜娜;

Titre : Studies on Quantitative Characteristics of AMF in Grazing Grassland of Seriphidium Desert and Its Growth-promoting Effects on Host Plants

Auteur : 李娜娜;

Grade : Master’s Theses 2020

Université : Université de Shihezi

Résumé _Seriphidium desert plays an important role in Xinjiang’s animal husbandry production.In recent years,overgrazing and changes in climatic conditions have led to a significant degradation of desert grasslands.Among them,a large number of arbuscular mycorrhizal fungi(AMF)in the soil can effectively resist the effects of grazing and drought on desert grassland vegetation to a certain extent.Obiective : To clarify the species diversity,spore density,and root infection status of AMF in soil of Seriphidium desert grassland at different grazing intensities,and the selection preference of different AMF to host plants.At the same time,the AMF species or specie combinations with the best growth-promoting effects and drought resistance on Seriphidium transiliense plants were screened.Finally,the role of AMF in stress resistance and its physiological mechanism was explained.Methods : In the Seriphidium desert grassland,GPS was used to set four grazing intensities of mild,moderate,severe,and extreme.From April 2018,soil samples and roots of plants(S.transiliense,S.capillata,F.ovina,C.liparocarpos)were taken monthly.On this basis,using S.transiliense as the research object,inoculating AMF(Fm,Ri,Gv,mixed H),and controlling the relative soil water content by pot weighing,and water stress 2 months after emergence,every 20 days,the leaves of the plant were taken to determine its root activity,water-holding capacities and related drought-resistant physiological indexes.The membership function method was used to comprehensively evaluate and select the AMF species and specie combinations with the best effect on plant growth-promoting and drought resistance.

Mots clés : Seriphidium Desert; AMF; Grazing pressure; Water stress;

Présentation (CNKI)

Page publiée le 4 novembre 2020, mise à jour le 23 juin 2021