| Autor: |
Lucy, Rowland, Antonio C L, da Costa, Alex A R, Oliveira, Rafael S, Oliveira, Paulo L, Bittencourt, Patricia B, Costa, Andre L, Giles, Azul I, Sosa, Ingrid, Coughlin, John L, Godlee, Steel S, Vasconcelos, João A S, Junior, Leandro V, Ferreira, Maurizio, Mencuccini, Patrick, Meir |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
The New Phytologist |
| ISSN: |
1469-8137 |
| Popis: |
Summary CO 2 efflux from stems (CO 2_stem) accounts for a substantial fraction of tropical forest gross primary productivity, but the climate sensitivity of this flux remains poorly understood.We present a study of tropical forest CO 2_stem from 215 trees across wet and dry seasons, at the world's longest running tropical forest drought experiment site.We show a 27% increase in wet season CO 2_stem in the droughted forest relative to a control forest. This was driven by increasing CO 2_stem in trees 10–40 cm diameter. Furthermore, we show that drought increases the proportion of maintenance to growth respiration in trees > 20 cm diameter, including large increases in maintenance respiration in the largest droughted trees, > 40 cm diameter. However, we found no clear taxonomic influence on CO 2_stem and were unable to accurately predict how drought sensitivity altered ecosystem scale CO 2_stem, due to substantial uncertainty introduced by contrasting methods previously employed to scale CO 2_stem fluxes.Our findings indicate that under future scenarios of elevated drought, increases in CO 2_stem may augment carbon losses, weakening or potentially reversing the tropical forest carbon sink. However, due to substantial uncertainties in scaling CO 2_stem fluxes, stand‐scale future estimates of changes in stem CO 2 emissions remain highly uncertain. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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