Phylogenetic structure and formation mechanism of shrub communities in arid and semiarid areas of the Mongolian Plateau.

Relationship between current climate factors and phylogenetic community structure The NRI of desert shrub and steppified shrub communities increased with increasing AI ( p = .01 and 0.14 when analyzed, respectively [Figure 4 a], or p < .01 when pooled together [Figure 4 b]), whereas the NRI of sandy shrub communities showed a decreasing trend (not significant, p = .33; Figure 4 a).

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Since the last glacial period, the Mongolian Plateau has shown a clear trend toward becoming warmer and wetter.

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We found that desert shrub communities showed a trend toward phylogenetic overdispersion; that is, limiting similarity was predominant in arid and semiarid areas of the Mongolian Plateau despite the phylogenetic structure and formation mechanisms differing across habitats.

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