However, as the order of dominance of these companion and occasional species declined, the effect of plant species on species diversity showed a highly significant exponential or linear downward trend ( R 2 : 0.891~0.967).
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An Investigation of the Magnitude of the Role of Different Plant Species in Grassland Communities on Species Diversity, China.
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The sentences
The families and genera of grasslands in Altai showed a trend of increasing and then decreasing, and the species showed a trend of decreasing and then increasing and then decreasing.