Effects of ecological restoration patterns on soil microbial community functional diversity in Zoige alpine desertification grassland

The prominent ecological strategic position of Zoige Plateau plays an important role in maintaining regional biodiversity and ecosystem stability. The study on the functional diversity of soil microbial community under different ecological restoration models is helpful to provide a scientific basis for the ecological environment reconstruction of alpine grassland and other similar regions in China, such as returning grazing to grassland, returning farmland to forest and grassland. The soil microbial community under different restoration modes in Zoige grassland was taken as the research object, and Biolog microplate method was used to compare the effects of ecological management measures on the ecosystem of sandy grassland and the diversity of soil microbial function. The results showed that the artificial ecological restoration model improved the activity of soil microorganisms in the sandy grassland, and the average well color development (AWCD) value of the restoration sample plot under the shrub-grass intercropping mode and the natural restoration sample plot reached 0.761 at stable state. Shannon index, Simpson index and McIntosh index of soil microbial community in the shrub-grass intercropping mode were higher than those in the grassland planting mode, and the index values were 3.290, 0.960 and 10.408, respectively. This mode could provide more niches for soil microbial communities. The carbon source capacity of grassland soil microbial community under shrub-grass intercropping restoration mode was higher than that under other restoration modes. Carbohydrates and amino acids were the most used carbon sources in Zoige grassland soil microbial community. The artificial management mode of shrub-grass intercropping combined with the biological measures to increase the carbon sources such as carbohydrates and amino acids in the grassland soil could be used to control the alpine sandy grassland in Zoige more efficiently.