<b>Facilitation-suppression transitions of plant functional diversity along the density gradient of a native </b><b>poisonous </b><b>plant in degraded alpine grasslands</b>

<p dir="ltr">This dataset accompanies the manuscript entitled <i>"Trait-mediated facilitation–suppression dynamics of a native toxic plant in degraded alpine grasslands"</i>, submitted to <i>Functional Ecology</i>. The study explores how the density-dependent expansion of <i>Ligularia virgaurea</i> influences plant community diversity, soil properties, and functional trait structure across alpine grasslands on the Qinghai–Tibet Plateau.</p>