Forest diversity and function : temperate and boreal systems by M Scherer-Lorenzen; Christian Körner; E -D Schulze; European

By M Scherer-Lorenzen; Christian Körner; E -D Schulze; European Science Foundation. "Linking Community and Ecosystem Ecology" Program

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12, the maximum relative growth rate of seedlings has no predictive value for the productivity of adult trees. Betula pendula shows the highest seeding RGR, but the lowest timber yield. Rank lists like this can and have been used to predict forest yield in mixed stands but also to parameterize forest dynamics models (see Pretzsch, Chap. ; Shugart et al. 1992). These monoculture data may not simply apply to growth under interspecific competition, but provide a first approximation of the potential growth rate of various taxa during canopy closure and thereafter.

As an example I refer to the variation in relative growth rate among temperate tree taxa in their seedling stage under standardized (optimal) growth conditions (Fig. 11). 01 g g–1 day–1 in Ilex and Taxus to ca. 12 g g–1 day–1 in some fast-growing deciduous species. 08 g g–1 day–1 Fig. 11. The relative growth rate (RGR) among seedlings of temperate zone forest species grown under optimal growth conditions in a controlled environment (from Cornelissen et al. 1996). Inset Cornelissen et al. (1998) arrived at similar relationships between RGR in evergreen and deciduous tree species in a larger sample of species An Introduction to the Functional Diversity of Temperate Forest Trees 27 record.

5 m), among deciduous species, oaks hold the record (ca. 4 m). Much greater rooting depths occur in semiarid woodlands, where depths exceeding 50 m have been reported (Canadell et al. 1996; Jackson et al. Among the most selective factors for tree species are periodic droughts. While deep roots may have a higher cost and compete with investments in shallow roots for nutrient acquisition, they ensure a moisture supply during periods of topsoil desiccation. They may also contribute to nutrient accessibility in upper soil horizons during such dry periods through Fig.

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