Fig. 2

Environmental parameters effect on VineyardFACE experiment bacterial composition. a, b Redundancy Analysis (RDA) based on Aitchison community dissimilarity distance matrix of green inter-rows (left) and open inter-rows (right) from ambient (blue) and elevated (red) CO₂ rings. WHC, Water holding capacity; CO₂ Conc., CO₂ concentration; Soil resp., Soil basal respiration; C, Total carbon concentration; N, Total nitrogen concentration; C:N, Carbon–nitrogen ratio; NH₄⁺, Ammonium concentration. c, d Multidimensional scaling (MDS) with a grid of ammonium concentration expressed as (µM NH₄*g⁻¹), using Aitchison community dissimilarity distance matrix of green and open inter-rows from ambient CO₂ rings (left), green and open inter-rows from elevated CO₂ rings (right). e, f Soil microbial respiration expressed as CO₂ production rate under the addition of different carbon substrates of green inter-rows from ambient and elevated CO₂ rings (left), and open inter-rows from ambient and elevated CO₂ rings (right). Error bars are expressed as variance of mean values