 |
| Titel |
Regional and seasonal patterns of litterfall in tropical South America |
| VerfasserIn |
J. Chave, D. Navarrete, S. Almeida, E. Álvarez, L. E. O. C. Aragão, D. Bonal, P. Châtelet, J. E. Silva-Espejo, J.-Y. Goret, P. Hildebrand, E. Jimenez, S. Patiño, M. C. Peñuela, O. L. Phillips, P. Stevenson, Y. Malhi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 1 ; Nr. 7, no. 1 (2010-01-05), S.43-55 |
| Datensatznummer |
250004363
|
| Publikation (Nr.) |
 copernicus.org/bg-7-43-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The production of aboveground soft tissue represents an important share of
total net primary production in tropical rain forests. Here we draw from a
large number of published and unpublished datasets (n=81 sites) to assess
the determinants of litterfall variation across South American tropical
forests. We show that across old-growth tropical rainforests, litterfall
averages 8.61±1.91 Mg ha−1 yr−1 (mean ± standard
deviation, in dry mass units). Secondary forests have a lower annual
litterfall than old-growth tropical forests with a mean of 8.01±3.41 Mg ha−1 yr−1.
Annual litterfall shows no significant
variation with total annual rainfall, either globally or within forest types.
It does not vary consistently with soil type, except in the poorest soils
(white sand soils), where litterfall is significantly lower than in other
soil types (5.42±1.91 Mg ha−1 yr−1). We also study the
determinants of litterfall seasonality, and find that it does not depend on
annual rainfall or on soil type. However, litterfall seasonality is
significantly positively correlated with rainfall seasonality. Finally, we
assess how much carbon is stored in reproductive organs relative to
photosynthetic organs. Mean leaf fall is 5.74±1.83 Mg ha−1 yr−1 (71% of total litterfall). Mean allocation
into reproductive organs is 0.69±0.40 Mg ha−1 yr−1 (9%
of total litterfall). The investment into reproductive organs divided by leaf
litterfall increases with soil fertility, suggesting that on poor soils, the
allocation to photosynthetic organs is prioritized over that to reproduction.
Finally, we discuss the ecological and biogeochemical implications of these
results. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|