Fig. 9

The shotgun metagenome profile of the SRS and ORR Hg contaminated soils using the MG-RAST at different subsystem levels. At subsystem level 1 (a), genes encoding for carbohydrate metabolism, amino acid and derivatives, and protein metabolism were the most dominant irrespective of the contamination level and the sampling season. At subsystem level 2 (b), genes encoding for central carbohydrate metabolism, protein biosynthesis are the most dominant. At subsystem level 3 (c), genes for phosphate metabolism and the TCA cycle predominated.