Forest structure and multi-taxonomic diversity in Apennine beech forests subjected to conservation-oriented interventions

European forests have a long history of management, which has often homogenized stand structure, impacting the diversity of forest biological communities. In the last decades, the pursuit of forest multifunctionality has put emphasis on the links between forest management, structure and biodiversity. However, the lack of integrated data on stand structure and multi-taxon biodiversity data has hampered the understanding of how changes in forest structure affect the composition of different taxonomic groups. In this data paper, we provide a dataset including forest structure and multi-taxon species diversity data in beech-dominated forests subjected to conservation-oriented forest management. We sampled standing trees, lying deadwood, as well as vascular flora, epiphytic lichens, and saproxylic fungi, in 19 sampling units within the Gran Sasso and Monti della Laga National Park (central Italy). The dataset provides information on: (i) the occurrence and abundance of the three taxonomic groups; (ii) tree inventory data (species, diameter at breast height, height, vitality, dominance, and origin); (iii) size, type and decay class of lying deadwood. This dataset can inform studies on biodiversity and management effects on forest ecosystems.