The Correlation Of Arbuscular Mycorrhizal Fungi And Soil Factors Of Psammochloa Villosa And Hedysalum Leave In Desert Environment

In a desert environment, the symbiosis between sand clonal plants and AM fungi can improve plant drought tolerance. This paper makes discussion and research on Psammochloa villosa and Hedysalum leave based on the background of Zheng-Lan Qi south-county of Xilinguole League of Inner Mongolia and Daba. In this research, the symbiosis between sand clonal plants and AM fungi, AM fungi ecological distribution, species diversity in the rhizosphere of clonal plants and effects of environment factors on AM fungi were systemically investigated. Results were showed as follows:Psammochloa villosa and Hedysalum leave can form a good symbiotic relationship with AM fungi and produce Intermediate type mycorrhizas. AM fungi average colonization rate of Psammochloa villosa is 68.83% and the average spore density is 523?100g soil. AM fungi average colonization rate of Hedysalum laeve is 82.76% and the average spore density is 440?100g soil. Plant roots have typical vesicle, arbuscular and hyphae ring structure.The spore density of Psammochloa villosa and Hedysalum leave has a significantly spatial and temporal heterogeneity. The total spore of July was higher than October. The number of spore decreased with the deepening of soil and the peak appears in the 0-10 cm soil layer. The change of spatial distribution of AM fungi and the colonization rate of Psammochloa villosa and Hedysalum leave followed a similar pattern. The maximum colonization rate is in the 0-30 cm soil layer.Spore density and colonization rate of Psammochloa villosa and Hedysalum leave was correlated with soil factors. Due to different host plants and site, there is a different at correlation.There were significantly different at between Psammochloa villosa and Hedysalum leave at hyphal colonization, vesicular colonization, total colonization, soil available N and soil available P. Spore density of Psammochloa villosa of Zhenglanqi was significant positive correlated with organic matter, soil available N, soil available P, acid phosphatase and alkaline phosphatase, and was positive correlated with urease. Spore density of Hedysalum leave of Zhenglanqi was positive correlated with alkaline phosphatase and urease. Spore density of Hedysalum leave of Dahexiang was positive correlated with SMB-C and SMB-P, and was negatively correlated with SMB-N.An abundant species resource of AM fungi was found the rhizospere of the Psammochloa villosa and Hedysalum. 36 AM fungi taxa in five genera were isolated and identified, of which 58.3% belong to the genus Glomus, 25% to Acaulospora, 11.1% to Scutellospora, other to Entrophospora and Gigaspora. In generally, isolation frequency, relative abundance and importance value followed the trend Glomus>Acaulospora>Scutellospora>Entrophospora=Gigaspora. G. reticulatum were the dominant species in the rhizosphere of Psammochloa villosa and Hedysalum leave.Studies have shown that sand clonal plants and AM fungi established symbiotic relationship, making sand clonal plants grow in harsh environments. The results of this study can provide a scientific basis for the applications of AM biotechnology in vegetation restoration and ecology reconstruction of desert.