Search our Database of Scientific Publications and Authors

I’m looking for a
    Effect of 7 yr of experimental drought on vegetation dynamics and biomass storage of an eastern Amazonian rainforest.
    New Phytol 2010 Aug 9;187(3):579-91. Epub 2010 Jun 9.
    Universidade Federal do Pará, Centro de Geociências, Belém, Pará, Brazil.
    *At least one climate model predicts severe reductions of rainfall over Amazonia during this century. Long-term throughfall exclusion (TFE) experiments represent the best available means to investigate the resilience of the Amazon rainforest to such droughts. *Results are presented from a 7 yr TFE study at Caxiuanã National Forest, eastern Amazonia. We focus on the impacts of the drought on tree mortality, wood production and above-ground biomass. *Tree mortality in the TFE plot over the experimental period was 2.5% yr(-1), compared with 1.25% yr(-1) in a nearby control plot experiencing normal rainfall. Differences in stem mortality between plots were greatest in the largest (> 40 cm diameter at breast height (dbh)) size class (4.1% yr(-1) in the TFE and 1.4% yr(-1) in the control). Wood production in the TFE plot was c. 30% lower than in the control plot. Together, these changes resulted in a loss of 37.8 +/- 2.0 Mg carbon (C) ha(-1) in the TFE plot (2002-2008), compared with no change in the control. *These results are remarkably consistent with those from another TFE (at Tapajós National Forest), suggesting that eastern Amazonian forests may respond to prolonged drought in a predictable manner.

    Similar Publications

    Mortality of large trees and lianas following experimental drought in an Amazon forest.
    Ecology 2007 Sep;88(9):2259-69
    Woods Hole Research Center, 149 Woods Hole Road, Falmouth, Massachusetts 02540-1644, USA.
    Severe drought episodes such as those associated with El Niño Southern Oscillation (ENSO) events influence large areas of tropical forest and may become more frequent in the future. One of the most important forest responses to severe drought is tree mortality, which alters forest structure, composition, carbon content, and flammability, and which varies widely. This study tests the hypothesis that tree mortality increases abruptly during drought episodes when plant-available soil water (PAW) declines below a critical minimum threshold. Read More
    Shifts in plant respiration and carbon use efficiency at a large-scale drought experiment in the eastern Amazon.
    New Phytol 2010 Aug 11;187(3):608-21. Epub 2010 Jun 11.
    Centre for the Environment, University of Oxford, Oxford, UK.
    *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. Read More
    Forest structure and carbon dynamics in Amazonian tropical rain forests.
    Oecologia 2004 Aug 17;140(3):468-79. Epub 2004 Jun 17.
    Laboratório de Ecologia Isotópica, CENA/USP, Av. Centenário, 303, PO-Box 96, Piracicaba, CEP 13400-970, SP, Brazil.
    Living trees constitute one of the major stocks of carbon in tropical forests. A better understanding of variations in the dynamics and structure of tropical forests is necessary for predicting the potential for these ecosystems to lose or store carbon, and for understanding how they recover from disturbance. Amazonian tropical forests occur over a vast area that encompasses differences in topography, climate, and geologic substrate. Read More