水保所知识产出(1956---)知识库

Information on the effect of anthropogenic activities on soil microbial communities can improve our ability to
formulate restoration strategies in the Tibetan Plateau, where meadow degradation has been an increasing
concern. In this study, we evaluated plant functional groups, soil properties, microbial communities, and their
functional groups in four types of meadows (grazed, fenced, fenced + reseeded, and intact) in the Tibetan
Plateau. Based on amplicon sequencing data, both the bacterial and fungal composition, their potential functions
and their possible drivers have been investigated. Fencing was the most effective approach to restore degraded
alpine meadows, characterized by higher aboveground biomass, soil nutrient levels, and microbial diversity. The
soil carbon, ammonium nitrogen, and the above- and below-ground biomass (mainly sedge and grass groups)
were closely related to the changes in bacterial and fungal composition, while the diversity of sedge, grass, le-
gumes, and forbs was largely associated with N cycling and fungal functional guilds. Grazing-to-fencing con-
version also caused changes in the microbial community composition, specifically resulting in a shift from
oligotrophs to copiotrophs, an increased abundance of diazotrophs and plant pathogens, and a decreased
abundance of nitrifiers. Our results revealed the effects of grazing-to-fencing conversion on an alpine meadow
and can provide significant guidance for the sustainable management of degraded grassland ecosystems.