Predicted total bacteria concentration in 16S rRNA gene copies.g−1 of Pinus halepensis needles.
White spots correspond to the location of sampled trees. Narrow black lines correspond to altitude. The cross corresponds to the location of the composting plant. The wind map shows the frequency of no wind (0 to1.5 m.s−1), light wind (1.5 to 4.5 m.s−1), moderate wind (4.5 to 8 m.s−1) and strong wind (up to 8 m.s−1) in, respectively, white, light grey, medium grey and dark grey (Meteo France, http://www.meteofrance.com/).