Fig. 2.

Dependence on elevation of a aboveground wood productivity and coarse root productivity, b aboveground litter production, and c fine root productivity in the four forest types. Dashed lines indicate linear regressions, colored areas the 95% confidence interval (NPPaW: r² = 0.60; P < 0.01; NPPCR: r² = 0.62, P < 0.01; NPPaLF: r² = 0.85, P < 0.001; NPPFR show no change with elevation; in all cases n = 12). aLF aboveground litter fall, aW aboveground wood, CR coarse roots, FR fine roots