Figure 2 Linear fitting plots of vegetation diversity index and
grazing gradient in different locations. A, C, and E are the linear
fitting plots of Simpson, Shannon, Pielou index and grazing gradient in
the dry season, and B, D, and F are the linear fitting plots of Simpson,
Shannon, Pielou index and grazing gradient in the rainy season.
Interaction of grazing
and climatic factors on vegetation diversity
Axis 1 in the NMDS figure represents the climate gradient and axis 2
represents the grazing gradient. Plant community composition was
significantly different under different grazing gradients. Vegetation
composition of grazing gradient 1 was mainly concentrated in the first
and second quadrants in different research sites, and mainly distributed
along axis 1. Grazing gradients 2-4 were mainly distributed along axis
2, concentrated in the third and fourth quadrants. Compared with the
rainy season, the plant community composition under different grazing
gradients at different study sites was more similar in the dry season.
In the dry season, the species composition of WA (DT=5.77℃, RT=9.94℃,
DP=40.1mm, RP=104.5mm) was significantly different from that of other
sites, and the species composition of other sites showed high
similarity. However, on the whole, the differences in species
composition under the grazing gradient in the dry season were
significantly lower than those in the rainy season (Figure 4).