Fig. 3. Soil microbial biomass (A)YS and (B) NYS and calorespirometric ratio (C) YS and (D) NYS of soil recollected in 2011 amended with: (a) 3 mg g−1glucose after 4 months,(b) 3 mg g−1after 7 months, (c) 5 (YS) and 3 mg g−1(NYS) after 12 months and (d) newly collected soil in 2012 with 5 mg g−1after 4 months