Fig. 2From: Variations in the natural 13C and 15N abundance of plants and soils under long-term N addition and precipitation reduction: interpretation of C and N dynamicsEffects of N addition, precipitation reduction and their combination on δ13C values and C concentration of trees and soils among different tree species. a and d: Pinus koraiensis; b and e: Tilia amurensis; and c and f: Fraxinus mandshurica. Error bars represent 1 SE of the meanBack to article page