fig5

Figure 5. Correlation matrix among the Carbon Footprint (CFP, kg CO₂ eq ton^-1) and the main chemical, microbiological and enzymatic soil parameters. Variables included: pH (H₂O, 1:2.5), EC (Electrical Conductivity, dS m^-1), WC (Water Content, %), WSP (Water Soluble Phenols, mg TAE g^-1 d.w.), TOC (Total Organic Carbon, %), TN (Total Nitrogen, %), C/N (Carbon to Nitrogen ratio, dimensionless), SOM (Soil Organic Matter, %), HC (Humified Carbon, %), FC (Fraction of Carbon easily decomposable, %), HC/FC (Humified Carbon to Fraction of Carbon ratio, %), MBC (Microbial Biomass Carbon, µg C g^-1), CEC [Cation Exchange Capacity, cmol(+) kg^-1], FUNGI (Fungi, % of total microbial biomass), BACT (Bacteria, % of total microbial biomass), ACT (Actinomycetes, % of total microbial biomass), FBC (Fungal Biomass Carbon, µg C g^-1), BBC (Bacterial Biomass Carbon, µg C g^-1), ABC (Actinomycetes Biomass Carbon, µg C g^-1), FDA (Fluorescein Diacetate hydrolase activity, µg fluorescein g^-1 h^-1), and DHA (Dehydrogenase activity, µg TPF g^-1 h^-1). The scale ranges from -1 (strong negative correlation, red) to +1 (strong positive correlation, green).