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| Titel |
Tree height integrated into pantropical forest biomass estimates |
| VerfasserIn |
T. R. Feldpausch, J. Lloyd, S. L. Lewis, R. J. W. Brienen, M. Gloor, A. Monteagudo Mendoza, G. López-González, L. Banin, K. Abu Salim, K. Affum-Baffoe, M. Alexiades, S. Almeida, I. Amaral, A. Andrade, L. E. O. C. Aragão, A. Araujo Murakami, E. J. M. M. Arets, L. Arroyo, G. A. Aymard C., T. R. Baker, O. S. Bánki, N. J. Berry, N. Cardozo, J. Chave, J. A. Comiskey, E. Álvarez, A. Oliveira, A. Fiore, G. Djagbletey, T. F. Domingues, T. L. Erwin, P. M. Fearnside, M. B. França, M. A. Freitas, N. Higuchi, C. E. Honorio, Y. Iida, E. Jimenez, A. R. Kassim, T. J. Killeen, W. F. Laurance, J. C. Lovett, Y. Malhi, B. S. Marimon, B. H. Marimon-Junior, E. Lenza, A. R. Marshall, C. Mendoza, D. J. Metcalfe, E. T. A. Mitchard, D. A. Neill, B. W. Nelson, R. Nilus, E. M. Nogueira, A. Parada, K. S.-H. Peh, A. Peña Cruz, M. C. Peñuela, N. C. A. Pitman, A. Prieto, C. A. Quesada, F. Ramírez, H. Ramírez-Angulo, J. M. Reitsma, A. Rudas, G. Saiz, R. P. Salomão, M. Schwarz, N. Silva, J. E. Silva-Espejo, M. Silveira, B. Sonké, J. Stropp, H. E. Taedoumg, S. Tan, H. Steege, J. Terborgh, M. Torello-Raventos, G. M. F. Heijden, R. Vásquez, E. Vilanova, V. A. Vos, L. White, S. Willcock, H. Woell, O. L. Phillips |
| 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. 8 ; Nr. 9, no. 8 (2012-08-27), S.3381-3403 |
| Datensatznummer |
250007253
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| Publikation (Nr.) |
 copernicus.org/bg-9-3381-2012.pdf |
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| Zusammenfassung |
Aboveground tropical tree biomass and carbon storage estimates commonly ignore tree height
(H). We estimate the effect of incorporating H on tropics-wide forest biomass estimates in 327 plots across four continents using 42 656 H and diameter measurements and harvested trees from 20 sites to answer the following questions:
1. What is the best H-model form and geographic unit to include in
biomass models to minimise site-level uncertainty in estimates of destructive biomass?
2. To what extent does including H estimates derived in (1)
reduce uncertainty in biomass estimates across all 327 plots?
3. What effect does accounting for H have on plot- and continental-scale forest biomass estimates?
The mean relative error in biomass estimates of destructively harvested trees when including H (mean 0.06), was half that when excluding H (mean 0.13). Power- and Weibull-H models provided the greatest reduction in uncertainty, with regional Weibull-H models preferred because they reduce uncertainty in smaller-diameter classes (≤40 cm D) that
store about one-third of biomass per hectare in most forests. Propagating the relationships from
destructively harvested tree biomass to each of the 327 plots from across the tropics shows that including H reduces errors from 41.8 Mg ha−1 (range 6.6 to 112.4) to 8.0 Mg ha−1 (−2.5 to 23.0). For all plots, aboveground live biomass was −52.2 Mg ha−1 (−82.0 to −20.3 bootstrapped 95% CI), or 13%, lower when including H estimates, with the greatest
relative reductions in estimated biomass in forests of the Brazilian Shield, east Africa, and Australia,
and relatively little change in the Guiana Shield, central Africa and southeast Asia. Appreciably different stand structure was observed among regions across the tropical continents, with some storing significantly more biomass in small diameter stems, which affects selection of the best height
models to reduce uncertainty and biomass reductions due to H. After accounting for
variation in H, total biomass per hectare is greatest in Australia, the Guiana Shield, Asia, central
and east Africa, and lowest in east-central Amazonia, W. Africa, W. Amazonia, and the Brazilian
Shield (descending order). Thus, if tropical forests span 1668 million km2 and store
285 Pg C (estimate including H), then applying our regional relationships implies that carbon
storage is overestimated by 35 Pg C (31–39 bootstrapped 95% CI) if H is ignored, assuming
that the sampled plots are an unbiased statistical representation of all tropical forest in terms of
biomass and height factors. Our results show that tree H is an important allometric factor that
needs to be included in future forest biomass estimates to reduce error in estimates of tropical
carbon stocks and emissions due to deforestation. |
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