Soil Biological Activity, Carbon and Nitrogen Dynamics in Modified Coffee Agroforestry Systems in Mexico

(1) Background: Coffee agroforestry systems (CAFS) in Veracruz, Mexico, are being displaced by avocado monocultures due to their high economic value. This change can generate alterations the type of organic residues produced and soil biological activity (SBA) which is sensitive climatic variations, changes floristic composition, agronomic management. It be evaluated through respiration macrofauna, both related carbon (C) nitrogen (N) dynamics. The objective was to: Analyze variation SBA as well C N dynamics modified coffee systems; (2) Methods: Three CAFS (renewed, intensive pruning, with introduction avocados) an plantation were compared. evaluations conducted during period 2017–2019. Soil parameters (respiration, contents) content plant biomass measured plots 25 × m2 from three depths triplicate. Spearman’s test a principal component analysis performed determine structural dependence on dynamics; (3) Results: showed lowest values (with 193 g CO2 ha−1 h−1 at 0–10 cm depth), this system did not display macrofauna increased content. C/N ratio avocado. Correlation between litter-related positive, but it negatively correlated matter total nitrogen, explaining 67.7% variation; (4) Conclusions: Modification generated variations contents.