“…Non-sterile soils behave similarly with a maximum at the beginning of the incubation and reaching a constant value thereafter, when soil enzymatic activity stabilises (Hernández-Soriano et al, 2009;Herrero-Hernández et al, 2011;Marín-Benito et al, 2012). The higher DHA values for S2 soil are probably due to higher nutrient availability and OC content (Table 1) (Yuan and Yue, 2012;Velmourougane et al, 2013). Furthermore, the higher DOC content of S2, less humified as evidenced by the lower HIX value (Table 1), also reflects a more available OC for soil microorganisms (Cox et al, 2000;Zaman et al, 2002).…”