Fig. 1From: Effect of nitrogen addition on soil CO2 efflux and fine root biomass in maple monocultures of the hyrcanian regiona Seasonal variations (mean ± SD; n = 3 per month) of the soil temperature; b seasonal variations (mean ± SD; n = 3 per month) of the soil moisture measured at control plot (no N addition) at depth of 10 cmBack to article page