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Title: Spatial Variation of Soil CO 2, CH 4 and N 2O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield

Abstract

The spatial variation of soil greenhouse gas fluxes (GHG; carbon dioxide—CO 2, methane—CH 4 and nitrous oxide—N 2O) remains poorly understood in highly complex ecosystems such as tropical forests. Here, we used 240 individual flux measurements of these three GHGs from different soil types, at three topographical positions and in two extreme hydric conditions in the tropical forests of the Guiana Shield (French Guiana, South America) to (1) test the effect of topographical positions on GHG fluxes and (2) identify the soil characteristics driving flux variation in these nutrient-poor tropical soils. Surprisingly, none of the three GHG flux rates differed with topographical position. CO 2 effluxes covaried with soil pH, soil water content (SWC), available nitrogen and total phosphorus. The CH 4 fluxes were best explained by variation in SWC, with soils acting as a sink under drier conditions and as a source under wetter conditions. Unexpectedly, our study areas were generally sinks for N 2O and N 2O fluxes were partly explained by total phosphorus and available nitrogen concentrations. This initial work describing the spatial variation of soil fluxes of the three main GHGs measured simultaneously in forests of the Guiana Shield lays the foundation for specific studies ofmore » the processes underlying the observed patterns.« less

Authors:
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [2];  [4];  [2]
  1. Univ. of Antwerp, Wilrijk (Belgium); Université de Guyane (French Guiana)
  2. Univ. of Antwerp, Wilrijk (Belgium)
  3. Univ. of Vienna (Austria); International Inst. of Applied Systems Analysis (IIASA), Laxenburg (Austria)
  4. Consejo Superior de Investigaciones Cientificas (CSIC), Catalonia (Spain); Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Catalonia (Spain)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); European Research Council (ERC)
OSTI Identifier:
1567141
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Ecosystems
Additional Journal Information:
Journal Volume: 21; Journal Issue: 7; Journal ID: ISSN 1432-9840
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
tropical forest; GHG soil fluxes; Guiana Shield; soil characteristics; spatial variation; French Guiana

Citation Formats

Courtois, Elodie A., Stahl, Clément, Van den Berge, Joke, Bréchet, Laëtitia, Van Langenhove, Leandro, Richter, Andreas, Urbina, Ifigenia, Soong, Jennifer L., Peñuelas, Josep, and Janssens, Ivan A. Spatial Variation of Soil CO2, CH4 and N2O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield. United States: N. p., 2018. Web. doi:10.1007/s10021-018-0232-6.
Courtois, Elodie A., Stahl, Clément, Van den Berge, Joke, Bréchet, Laëtitia, Van Langenhove, Leandro, Richter, Andreas, Urbina, Ifigenia, Soong, Jennifer L., Peñuelas, Josep, & Janssens, Ivan A. Spatial Variation of Soil CO2, CH4 and N2O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield. United States. doi:10.1007/s10021-018-0232-6.
Courtois, Elodie A., Stahl, Clément, Van den Berge, Joke, Bréchet, Laëtitia, Van Langenhove, Leandro, Richter, Andreas, Urbina, Ifigenia, Soong, Jennifer L., Peñuelas, Josep, and Janssens, Ivan A. Wed . "Spatial Variation of Soil CO2, CH4 and N2O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield". United States. doi:10.1007/s10021-018-0232-6. https://www.osti.gov/servlets/purl/1567141.
@article{osti_1567141,
title = {Spatial Variation of Soil CO2, CH4 and N2O Fluxes Across Topographical Positions in Tropical Forests of the Guiana Shield},
author = {Courtois, Elodie A. and Stahl, Clément and Van den Berge, Joke and Bréchet, Laëtitia and Van Langenhove, Leandro and Richter, Andreas and Urbina, Ifigenia and Soong, Jennifer L. and Peñuelas, Josep and Janssens, Ivan A.},
abstractNote = {The spatial variation of soil greenhouse gas fluxes (GHG; carbon dioxide—CO2, methane—CH4 and nitrous oxide—N2O) remains poorly understood in highly complex ecosystems such as tropical forests. Here, we used 240 individual flux measurements of these three GHGs from different soil types, at three topographical positions and in two extreme hydric conditions in the tropical forests of the Guiana Shield (French Guiana, South America) to (1) test the effect of topographical positions on GHG fluxes and (2) identify the soil characteristics driving flux variation in these nutrient-poor tropical soils. Surprisingly, none of the three GHG flux rates differed with topographical position. CO2 effluxes covaried with soil pH, soil water content (SWC), available nitrogen and total phosphorus. The CH4 fluxes were best explained by variation in SWC, with soils acting as a sink under drier conditions and as a source under wetter conditions. Unexpectedly, our study areas were generally sinks for N2O and N2O fluxes were partly explained by total phosphorus and available nitrogen concentrations. This initial work describing the spatial variation of soil fluxes of the three main GHGs measured simultaneously in forests of the Guiana Shield lays the foundation for specific studies of the processes underlying the observed patterns.},
doi = {10.1007/s10021-018-0232-6},
journal = {Ecosystems},
number = 7,
volume = 21,
place = {United States},
year = {2018},
month = {2}
}

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Works referenced in this record:

Separating root and soil microbial contributions to soil respiration: A review of methods and observations
journal, January 2000

  • Hanson, P. J.; Edwards, N. T.; Garten, C. T.
  • Biogeochemistry, Vol. 48, Issue 1, p. 115-146
  • DOI: 10.1023/A:1006244819642