Study On The Ecological Distribution And Species Diversity Of Three Desert Plants AM Fungi

The ecological environment in the northwestern desert region of China is poor,precipitation is scarce,and land desertification is serious,which makes it difficult for plants to grow,sparse vegetation,scarce species,and simple composition of plant communities.Improving soil microenvironment and restoring vegetation construction is an effective method to improve soil desertification and thus desert environment.Nitraria tangutorum Bor.,Potaninia mongolica.,and Oxytropis aciphylla Ledeb.are the dominant species in the Northwest Desert,and have high practical value.The effect of soil erosion.AM fungus is a probiotic fungus that can be symbiotic with plant roots.It can promote plant roots to absorb N,P and other elements and water from surrounding soil.Its secreted glomacin is a sugar with a certain surface adhesion.Protein can be released into the soil to increase soil organic carbon content and improve soil quality.External factors will affect the growth and distribution of AM fungi.AM fungi will show different adaptability to different host plants and ecological environments.The factors that affect the distribution of AM fungal community are mainly divided into two categories,biological factors and abiotic factors.In this study,there are three desert plants: Nitraria tangutorum Bor.,Potaninia mongolica.,and Oxytropis aciphylla Ledeb.Through biochemical methods and microscopic observation,the distribution of AM fungi in plant rhizosphere soil under natural conditions was studied,and the adaptability characteristics of AM fungi in arid environment,the relationship between AM fungi and soil factors,the relationship between AM fungi and other mycorrhizal fungi Mutual influences provide a basis for making full use of the AM fungal germplasm resources to promote plant growth,selecting the dominant strain suitable for the best combination of soil-plant-mycorrhizal,and promoting plant growth and vegetation restoration in arid areas.The main results as follows:1.The three desert plants selected in this experiment can form a good symbiotic relationship with AM fungi.The symbiosis between AM fungi and roots is an effective ecological strategy for plants to adapt to desert habitats.2.The ecological distribution of AM fungi has obvious spatial and temporal heterogeneity.Due to geographical and climatic factors,the distribution of AM fungi in different years is different.The three desert plants selected in this experiment can form a good symbiotic relationship with AM fungi.The symbiosis between AM fungi and roots is an effective ecological strategy for plants to adapt to desert habitats.3.The principal component analysis of soil factors shows that soil moisture,organic C,EE-GRSP,T-GRSP,and effective N are the main influencing factors of each plot,and can basically reflect the soil fertility of the desert belt in the northwest.4.The physical and chemical properties of soil are closely related to AM fungi.The soil moisture,available phosphorus content,total extracted globulin and the total colonization rate of AM fungi are positively correlated.4.Desert plants and AM fungi have mutual selectivity and preference.The infection rate of AM fungi in three plants: Oxytropis aciphylla > Potaninia mongolica > Nitraria tangutorum;spore density Oxytropis aciphylla > Potaninia mongolica > Nitraria tangutorum.5.The structure of AM fungi promotes growth between each other.The Spearman correlation analysis shows that the mycelial colonization rate,vesicle colonization rate,total colonization rate and total colonization intensity of the three plants in this experiment are extremely mutually.Significant positive correlation.DSE and AM fungi infect three plants at the same time;there is a competition between different fungi.The DSE microsclerotia colonization rate was negatively correlated with the total AM colonization rate and total colonization intensity.6.AM fungi have different characteristics,the main differences are reflected in shape,color,spore diameter,spore wall,spore pattern and hyphae.The main morphology of AM fungal spores observed in this experiment is smaller in volume,darker in color,and has more attachments to the outer layer of the cell wall.AM adapts to desert habitats.Compared with other habitats,the morphology of AM fungal spores is shrivelled.6.AM fungal spores have different characteristics,the main differences are reflected in shape,color,spore diameter,spore wall,spore decoration and hyphae.The main morphology of AM fungal spores observed in this experiment is smaller in volume,darker in color,and has more attachments to the outer layer of the cell wall.AM adapts to desert habitats.Compared with other habitats,the morphology of AM fungal spores is not as full.7.A total of 44 species of AM fungi in 6 genera were identified in this experiment,including 10 species of Acaulospora,1 species of Claroideoglomus,1 species of Entrophospora,and Three species of Funneliformis;25 species of Glomus;4 species of Scutellospora.No new species have been found.Among them,Claroideoglomus is only found in cotton spines,and Entrophospora is only found in cat head spines.