| 英文摘要： |
Desertification can pose threats to global socioeconomic development, ecological and environmental safety, human health and survival. Species and function diversity are two aspects of biodiversity, and soil fungal community are important decomposers, playing important roles in element cycling. A field experiment was performed along a desertification gradient in an alpine steppe, the Northern Tibet to investigate how can the species alpha-diversity and composition, function alpha-diversity and composition change. No significant differences of species alpha-diversity were observed among the five desertification treatments. A significant difference of the function alpha-diversity was only observed between the light and severely heavy desertification treatments. Significant differences of species composition were observed between any two of the five desertification treatments. Function composition between not all any two treatments had significant differences. The changes of species and function composition along the desertification gradient were mainly attributed to BGB:AGB, 0.15-2 mm and < 0.15 mm soil particles. Two phyla (Glomeromycota and Zygomycota) and two trophic modes (Symbiotroph and Pathotroph-Saprotroph) were the differentially taxa and ecological functions, respectively, which indicated that the two phyla and trophic modes can be used to indicate desertification gradient, and combination of species and function composition may be better in monitoring desertification conditions. |
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