One-time soil measurements

One-time measurements of soil biochemical characteristics in the top 50 cm of soil at five forest sites in Panama (site numbers shown correspond to the map provided in the supplementary data for this article). Characteristics include: natural abundance 15N (soil15N; ‰), 15N enrichment factor (see paper for detailed calculation), organic carbon (C; mg C g-1), total nitrogen (N; mg N g-1), carbon to nitrogen ratio (CN), effective cation exchange capacity (ECEC; mmolc kg-1), exchangeable bases (BS; mmolc kg-1), exchangeable element concentrations (Na, K, Ca, Mg, Fe, Mn, Al; mmolc kg-1), pH and particle size: sand, silt and clay (%).