Data from: Evidence for linkages between the root elementome and oak decline in Mediterranean systems invaded by soil-borne pathogens

This dataset compiles root elemental composition and ecological
information from Quercus ilex trees sampled across Mediterranean dehesa
ecosystems affected by the soil‑borne pathogen Phytophthora cinnamomi. For
each tree, the dataset includes plot metadata, health indicators such as
crown defoliation, P. cinnamomi density, root elemental concentrations (in
ppm), and a set of derived stoichiometric ratios that capture nutrient
balance and potential physiological stress. All information is organized
in a single table where rows correspond to individual trees and columns
represent identifiers, health variables, elemental concentrations, or
elemental ratios. The chemical measurements encompass major nutrients,
trace elements, and physiologically meaningful ratios commonly used to
assess nutritional imbalances. Some variables contain null values because
certain chemical analyses were performed only on a subset of samples. The
dataset is suitable for reuse in research on forest decline, nutrient
cycling, ecological stoichiometry, and plant–pathogen interactions. It is
particularly valuable for exploring how elemental composition relates to
tree health and pathogen presence across spatial scales. All measurements
were obtained through standardized field and laboratory procedures, and
the dataset contains no personal or sensitive information. There are no
legal or ethical restrictions on reuse beyond standard citation of the
associated article.