The species composition and distribution of NTF in Yunnan Province
We identified 44 NTF species from 2,250 samples. These species belonged to three genera: Arthrobotrys (29 species), Dactylella (9 species), and Drechslerella (6 species) (Table S3). The rank order of occurrence frequency (OF) of NTF species corresponded to a logarithmic distribution model (R2 = 0.940) (Figure 3). Four species were widely distributed (mean OF = 5.22%), and contributed to 9.09% of the total species richness and 62.32% of the total OF. Conversely, 31 species were classified as rare (mean OF = 0.18%), and contributed to 70.45% of the total species richness and 7.52% of the total OF.
A mean variance ratio of 1.07 (t = 0.7029,p> 0.05) indicated that NTF species were randomly distributed (Figure 4).