Rainy season onset mainly drives the spatiotemporal variability of spring vegetation green-up across alpine dry ecosystems on the Tibetan Plateau.

During 2001–2013, T -30d had an increasing trend in 28 of the 67 sites (P < 0.05 for 17 sites, P < 0.10 for 11 sites) but varied little in remaining other sites (Fig.

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