藏北高寒草地土壤真菌群落系统发育多样性对放牧的响应

本研究依托沿海拔梯度布设的三个配对的围栏和自由放牧样地探讨了土壤真菌系统发育多样性对放牧的响应规律.结果表明:暖季放牧和冷季放牧都没有改变高寒草原化草甸土壤真菌系统发育α多样性,暖季放牧也没有改变高寒草甸土壤真菌系统发育α多样性;暖季放牧和冷季放牧都显著改变了高寒草原化草甸土壤真菌群落系统发育结构,且暖季放牧也显著改变...

Responses of Phylogenetic Diversity of Soil Fungal Community to Grazing in Alpine Grasslands of the Northern Tibet

Investigating the phylogenetic diversity of soil fungal community under grazing conditions can provide guidance for the optimal management of grassland grazing.In this study,the responses of the phylogenetic diversity of soil fungal community to grazing were compared in three paired fenced and free grazing sites.The results showed that warm-season grazing and cold-season grazing did not significantly change the phylogeneticαdiversity of soil fungal community in the alpine steppe meadow,and warm-season grazing did not significantly change the phylogeneticαdiversity of soil fungal community in the alpine meadow.Both warm-season grazing and cold-season grazing significantly changed the phylogenetic structure of soil fungal community in the alpine steppe meadow,and warm-season grazing also significantly changed the phylogenetic structure of soil fungal community in the alpine meadow.The phylogenetic structure of soil fungal community was mainly affected by changing the phylogenetic structure of different phyla.The phylogenetic structure of soil fungal communities in the two alpine steppe meadows got more and more similar due to grazing,which might be related to the increasing similarity of soil water content between the two alpine steppe meadows under grazing conditions.Therefore,the effects of cold-season grazing and warm-season grazing on soil fungal phylogenetic diversity in the alpine steppe meadow were different,and the responses of soil fungal phylogenetic diversity in the alpine steppe meadow and the alpine meadow to warm-season grazing were different.In addition,grazing changed the altitudinal pattern of phylogeneticβdiversity of soil fungal communities.