Plant community data along elevational gradients in China's 17 mountains.

Mountains in China are crucial for biodiversity conservation due to unique topography and climate, providing essential habitats and refugia for many plant species. Standardized open datasets along elevational gradients across multiple mountains remain limited. Here we used standardized field protocols to collect plant diversity data of 370 permanent sampling plots along elevations in 17 mountains. Species identity and abundance of all woody plants with ≥ 1 cm diameter at breast height were recorded. We calculated species-level basal area, abundance, and relative importance value for all plants, and separately for two vegetation layers. The dataset spans 46° longitude, 24° latitude, ranges from 166 to 3,835 m a.s.l., and includes 1,493 species from 121 families and 449 genera. It covers nearly all major ecosystems from tropical rainforests to tundra, providing baseline data for studying plant diversity changes along elevations and latitudes. This dataset enables direct comparisons across mountains, helping evaluate impacts of climate and land-use changes on species range shifts and ecosystem transitions, and inform conservation strategies for mountain ecosystems.