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Spatial variability of soil N₂O and CO₂ fluxes in different topographic positions in a tropical montane forest in Kenya

Arias-Navarro, C. 1,2; Díaz-Pinés, E. 1,2; Klatt, S. 1,2; Brandt, P.; Rufino, M. C.; Butterbach-Bahl, K. 1,2; Verchot, L. V.
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)
2 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

Quantifying and understanding the small-scale variability of nitrous oxide (N₂O) and carbon dioxide (CO₂) emission are essential for reporting accurate ecosystem greenhouse gas budgets. The objective of this study was to evaluate the spatial pattern of soil CO₂ and N₂O emissions and their relation to topography in a tropical montane forest. We measured fluxes of N₂O and CO₂ from 810 sampling locations across valley bottom, midslope, and ridgetop positions under controlled laboratory conditions. We further calculated the minimum number of samples necessary to provide best estimates of soil N₂O and CO₂ fluxes at the plot level. Topography exhibited a major influence on N₂O emissions, with soils at midslope position emitting significantly less than at ridgetops and valley bottoms, but no consistent effect of topography on soil CO₂ emissions was found. The high spatial variation of N₂O and CO₂ fluxes was further increased by changes in vegetation and soil properties resulting from human disturbance associated with charcoal production. Soil N₂O and CO₂ fluxes showed no spatial pattern at the plot level, with “hot spots” strongly contributing to the total emissions (10% of the soil cores represented 73 and 50% of the total N₂O and CO₂ emissions, respectively). ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000068753
Veröffentlicht am 18.01.2018
Originalveröffentlichung
DOI: 10.1002/2016JG003667
Scopus
Zitationen: 48
Web of Science
Zitationen: 39
Dimensions
Zitationen: 55
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 0148-0227, 2156-2202, 2169-8953, 2169-8961
urn:nbn:de:swb:90-687537
KITopen-ID: 1000068753
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Journal of geophysical research / Biogeosciences
Verlag John Wiley and Sons
Band 122
Heft 3
Seiten 514-527
Schlagwörter tropical forest, topography, spatial variability, nitrous oxide, carbon dioxide, hot sports
Nachgewiesen in Web of Science
Scopus
Dimensions
Globale Ziele für nachhaltige Entwicklung Ziel 13 – Maßnahmen zum Klimaschutz
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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