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Comparisons of the effects of contemporary climate vs. habitat heterogeneity, as well as the effects of energy availability vs. water availability, on species richness for (A, D) total diversity, (B, E) herbaceous, and (C, F) woody plants on the Qinghai-Tibetan Plateau. In each subplot, the variation of species richness is partitioned into (a) the independent effect of climate, (b) the covarying effect, (c) the independent effect of habitat heterogeneity, and (d) residual variation.
