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Université du Xinjiang (2017)

Arbuscular Mycorrhizal Fungi of Biological Crusts in Different Plant Communities

王凤凤;

Titre : Arbuscular Mycorrhizal Fungi of Biological Crusts in Different Plant Communities

Auteur : 王凤凤;

Grade : Master’s Theses 2017

Université : Université du Xinjiang

Résumé
Arbuscular mycorrhizal fungi are widely distributed in nature and can form symbiosis with most terrestrial higher plants.The composition and diversity of AM fungi play an important role in regulating plant community structure,determining plant biodiversity and ecosystem productivity,and maintaining ecosystem functions and stability.The biological crust is the most characteristic micro natural landscape in desert area.It is a composite biological soil layer formed by mosses,lichens,algae and fungi.The formation of the biological crust has some influences on the biodiversity,the maintenance of the system function and the process of vegetation evolution in the arid area.Therefore,this paper studied the biological diversity of arbuscular mycorrhizal fungi and their correlation with the density and soil factors of different plant communities in different soil layers of different plant communities in the Gurbantunggut Desert,Fukang District,and discussed the relationship between biological factors Cortical biodiversity and its symbiotic characteristics,in order to further reveal the structure and function of biological crust and desertification desert vegetation construction to provide experimental basis.The specific results are as follows :(1)From the biological crusts of different plant communities in the Gurbantunggut Desert under only isolated mosses with Tortula desertorum,Bryum argenteum,Bryaceae several mosses ;lichen moss has students double edge clothing,red phosphorus net etc.several species of lichens are mainly algae ;lynbya of Synechococcus,Microcoleus vaginatus algae etc..Observation of plant stems and leaves skin showed the vesicles and hyphae,but not found only in arbuscular mosses in rhizoids occasionally hyphae were observed and found a small amount of AM fungal hyphae and spores in the surrounding plant.(2)There are few species of AM fungi in the desert through the desert,which should be said to be relatively simple.0-15 cm in different soil layers in 3 different plant communities in soil isolated and identified 9 species of AM fungi belonging to 3 genera,including glomus(Glomus)6,acaulospora(Acaulospora)2,archaeospora(Achaeospora)1.Among them,glomus belongs to the dominant genus.(3)In the same plant community,there were differences in the species and spore density of the fungi in the soil and in the soil layers with crusts and crusts.Crust soil crusts,soil and plant rhizosphere soil crust and crust without vegetation bare soil samples of fungal spore density and species richness,fungal spore density and their richness from high to low values are:No crust plant rhizosphere soil > subcortical soil > crust soil > no crust,no vegetation,bare soil.(4)In the plant communities of Artemisia plant communities and ephedra distachya Haloxylon ammodendron community and different months on fungal spores,dense sub species richness and Shannon Wiener index were showed the highest in August,September and July times.(5)The soil factor test results showed that the total phosphorus,available phosphorus,total nitrogen,alkali hydrolyzable nitrogen and organic matter in the soil crust,cortex and soil were all higher than those in the subcortical soil,but not significantly lower than the pH value.(6)The spore density,species richness and diversity index of fungi in different months and different soil layers can sometimes be significantly correlated with various soil factors,and there is no regularity.The population density of biological crusts was significantly correlated with the spore density of plant rhizosphere soil.

Mots clés : AM fungi; biological crusts; different plant communities; different soil laye;

Présentation (CNKI)

Page publiée le 6 juin 2018