Projects per year
Abstract
P>The effects of drought on the Amazon rainforest are potentially large but remain poorly understood. Here, carbon (C) cycling after 5 yr of a large-scale through-fall exclusion (TFE) experiment excluding about 50% of incident rainfall from an eastern Amazon rainforest was compared with a nearby control plot.
Principal C stocks and fluxes were intensively measured in 2005. Additional minor components were either quantified in later site measurements or derived from the available literature.
Total ecosystem respiration (R-eco) and total plant C expenditure (PCE, the sum of net primary productivity (NPP) and autotrophic respiration (R-auto)), were elevated on the TFE plot relative to the control. The increase in PCE and R-eco was mainly caused by a rise in R-auto from foliage and roots. Heterotrophic respiration did not differ substantially between plots. NPP was 2.4 +/- 1.4 t C ha-1 yr-1 lower on the TFE than the control. Ecosystem carbon use efficiency, the proportion of PCE invested in NPP, was lower in the TFE plot (0.24 +/- 0.04) than in the control (0.32 +/- 0.04).
Drought caused by the TFE treatment appeared to drive fundamental shifts in ecosystem C cycling with potentially important consequences for long-term forest C storage.
Original language | English |
---|---|
Pages (from-to) | 608-621 |
Number of pages | 14 |
Journal | New Phytologist |
Volume | 187 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2010 |
Keywords / Materials (for Non-textual outputs)
- Amazon rain forest
- carbon cycling
- carbon dioxide
- carbon use efficiency
- drought
- gross primary productivity
- net primary productivity
- partitioning
- ABOVEGROUND LIVE BIOMASS
- NET PRIMARY PRODUCTION
- MOIST TROPICAL FOREST
- BELOW-GROUND CARBON
- RAIN-FOREST
- CLIMATE VARIABILITY
- SOIL EMISSIONS
- NITROUS-OXIDE
- GAS-EXCHANGE
- NITRIC-OXIDE
Fingerprint
Dive into the research topics of 'Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon'. Together they form a unique fingerprint.Projects
- 3 Finished
-
-
-
The impact of drought on water and carbon dioxide fluxes from Brazilian rain forest
Grace, J.
1/10/98 → 30/09/02
Project: Research