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| Titel |
Coordination of physiological and structural traits in Amazon forest trees |
| VerfasserIn |
S. Patiño, N. M. Fyllas, T. R. Baker, R. Paiva, C. A. Quesada, A. J. B. Santos, M. Schwarz, H. Steege, O. L. Phillips, J. Lloyd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 2 ; Nr. 9, no. 2 (2012-02-16), S.775-801 |
| Datensatznummer |
250006767
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| Publikation (Nr.) |
 copernicus.org/bg-9-775-2012.pdf |
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| Zusammenfassung |
Many plant traits covary in a non-random manner reflecting
interdependencies associated with "ecological strategy" dimensions. To
understand how plants integrate their structural and physiological investments, data
on leaf and leaflet size and the ratio of leaf area to sapwood area
(ΦLS) obtained for 1020 individual trees (encompassing 661 species) located in 52 tropical forest plots
across the Amazon Basin were incorporated into an analysis utilising existing
data on species maximum height (Hmax), seed size, leaf mass per unit area
(MA), foliar nutrients and δ13C, and branch xylem density (ρx).
Utilising a common principal components approach allowing eigenvalues
to vary between two soil fertility dependent species
groups, five taxonomically controlled trait dimensions were
identified. The first involves primarily cations, foliar carbon and
MA and is associated with differences in foliar construction costs. The
second relates to some components of the classic "leaf economic spectrum", but with increased
individual leaf areas and a higher ΦLS newly identified components for tropical tree species. The
third relates primarily to increasing Hmax and hence variations in light
acquisition strategy involving greater MA, reductions in ΦLS and
less negative δ13C. Although these first three dimensions were more
important for species from high fertility sites the final two dimensions were
more important for low fertility species and were associated with variations
linked to reproductive and shade tolerance strategies.
Environmental conditions influenced structural traits with ρx
of individual species decreasing with increased soil fertility and higher
temperatures. This soil fertility response appears to be synchronised with
increases in foliar nutrient concentrations and reductions in foliar [C].
Leaf and leaflet area and ΦLS were less responsive to the
environment than ρx.
Thus, although genetically determined foliar traits such as those
associated with leaf construction costs coordinate independently of
structural characteristics such as maximum height, others such as the classical "leaf economic spectrum" covary with
structural traits such as leaf size and ΦLS. Coordinated structural and physiological adaptions are also associated with light
acquisition/shade tolerance strategies with several traits such as MA and [C] being significant components of more than one ecological strategy dimension. This is argued to be a consequence of a range of different potential underlying causes for any observed variation in such "ambiguous" traits.
Environmental effects on structural and physiological characteristics are also coordinated but in a
different way to the gamut of linkages associated with genotypic differences. |
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