Fig. 3

Redundancy analysis ordination plot of soil organic carbon fractions constrained by environmental variables that significantly explain variation. SOC: soil organic carbon; DOC: dissolved organic carbon; EOC: easily-oxidised organic carbon; MBC: microbial biomass carbon; BD: bulk density; T: temperature; W: water content; TN: total nitrogen; AN: ammonium; NN: nitrate; CR: carbon content in fine roots; CL: carbon content in leaves; CM: carbon content in organic mulch. “.B” means “in bulk soil” and “.R” means “in rhizosphere”