Carbon in above-ground tree biomass for forests growing on N-rich and N-poor lithology.

Plot of carbon (Mg ha−1) against stand age for FIA plots (n = 88) on N-rich (crosses) and N-poor (triangles) lithologies used in the model. To account for model axes not shown, we present detransformed model estimates for sites on N-rich (solid line) and N-poor (dashed line) lithologies, holding other model parameters constant at nominal values to illustrate differences in carbon storage attributable to lithology. The grey area indicates lithology s.e.m. Our analysis estimates that sites on N-rich lithology contain 42% more C in above-ground tree biomass than sites on N-poor lithology (P = 0.009; adjusted R2 = 0.66) after accounting for confounding state factors.

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