Figures & data
Table 1 Main properties of the temperate and tropical soils at various depths
Table 2 Total C and N concentrations of litter under different forest stands
Figure 1 Effects of tree species and soil depths on (a) microbial respiration, (b) microbial biomass C and (c) metabolic quotient in temperate and tropical soils during the 7-day (▪) and 21-day incubations (□). Error bars are the standard error of three replicates.
Figure 2 Relationship between soil microbial biomass C concentrations in the 7-day incubation to the concentrations of exchangeable (a) Ca, (b) Mg and (d) Al, and to (c) the ratios of water soluble organic C to total N concentration in temperate and tropical soils at various depths. Error bars are the standard error of three replicates. The linear or non-linear regression indicates the microbial C, y, against (the concentrations of soil exchangeable Ca, Mg and Al, or the ratios of soil water soluble organic C to total N concentration), x.
Figure 3 Relationships between microbial metabolic quotients in the 7-day incubation to (a) the total C:N ratios, (b) the concentrations of water soluble organic C and (c) exchangeable Al, and to (d) the ratios of exchangeable Al to water soluble organic C concentration in temperate and tropical soils at various depths. Error bars are the standard error of three replicates. The linear or non-linear regression indicates the metabolic quotients, y, against (the total C:N ratios, the concentrations of water soluble organic C and exchangeable Al, or the ratios of exchangeable Al to water soluble organic C concentration in the soil), x.
