Effects of an induced drought on soil carbon dioxide (CO2) efflux and soil CO2 production in an Eastern Amazonian rainforest, Brazil

2007 | journal article. A publication with affiliation to the University of Göttingen.

Jump to:Cite & Linked | Documents & Media | Details | Version history

Cite this publication

​Effects of an induced drought on soil carbon dioxide (CO2) efflux and soil CO2 production in an Eastern Amazonian rainforest, Brazil​
Sotta, E. D. ; Veldkamp, E. ; Schwendenmann, L. ; Guimãres, B. R.; Paixão, R. K.; Ruivo, M. de L. P. & Lola da Costa, A. C. et al.​ (2007) 
Global Change Biology13(10) pp. 2218​-2229​.​ DOI: https://doi.org/10.1111/j.1365-2486.2007.01416.x 

Documents & Media


GRO License GRO License


Sotta, Eleneide Doff ; Veldkamp, Edzo ; Schwendenmann, Luitgard ; Guimãres, Brenda Rocha; Paixão, Rosiene Keila; Ruivo, Maria de Lourdes P.; Lola da Costa, Antonio Carlos; Meir, Patrick
In the next few decades, climate of the Amazon basin is expected to change, as a result of deforestation and rising temperatures, which may lead to feedback mechanisms in carbon (C) cycling that are presently unknown. Here, we report how a throughfall exclusion (TFE) experiment affected soil carbon dioxide (CO2) production in a deeply weathered sandy Oxisol of Caxiuanã (Eastern Amazon). Over the course of 2 years, we measured soil CO2 efflux and soil CO2 concentrations, soil temperature and moisture in pits down to 3 m depth. Over a period of 2 years, TFE reduced on average soil CO2 efflux from 4.3±0.1 μmol CO2 m−2 s−1 (control) to 3.2±0.1 μmol CO2 m−2 s−1 (TFE). The contribution of the subsoil (below 0.5 m depth) to the total soil CO2 production was higher in the TFE plot (28%) compared with the control plot (17%), and it did not differ between years. We distinguished three phases of drying after the TFE was started. The first phase was characterized by a translocation of water uptake (and accompanying root activity) to deeper layers and not enough water stress to affect microbial activity and/or total root respiration. During the second phase a reduction in total soil CO2 efflux in the TFE plot was related to a reduction of soil and litter decomposers activity. The third phase of drying, characterized by a continuing decrease in soil CO2 production was dominated by a water stress-induced decrease in total root respiration. Our results contrast to results of a drought experiment on clay Oxisols, which may be related to differences in soil water retention characteristics and depth of rooting zone. These results show that large differences exist in drought sensitivity among Amazonian forest ecosystems, which primarily seem to be affected by the combined effects of texture (affecting water holding capacity) and depth of rooting zone.
Issue Date
Global Change Biology 
Fakultät für Forstwissenschaften und Waldökologie ; Büsgen-Institut ; Burckhardt-Institut ; Abteilung Ökopedologie der Tropen und Subtropen ; Abteilung Waldbau und Waldökologie der Tropen 



Social Media