Elevation gradient effects on grassland species diversity and phylogenetic in the two-river source forest region of the Altai Mountains, Xinjiang, China.

Although the phylogenetic structure did not exhibit a significant trend of transitioning from divergence to clustering along the altitudinal gradient, the overall phylogenetic pattern of grassland communities tended toward clustering.

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Both the Shannon-Wiener diversity index and Simpson diversity index show a decreasing trend at higher elevations, reflecting these constraints ( Kraft et al., 2011 ).

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