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Soil carbon dioxide and methane fluxes from forests and other land use types in an African tropical montane region

Wanyama, I.; Pelster, D. E.; Butterbach-Bahl, K.; Verchot, L. V.; Martius, C.; Rufino, M. C.

Abstract:
In the last 40 years, large areas of the Mau forest, the largest contiguous tropical montane forest in East Africa, have been cleared for agriculture. To date, there are no empirical data on how this land use change affects carbon dioxide (CO2) fluxes from soil respiration and soil methane (CH4) fluxes. This study reports measured annual soil CO2 and CH4 fluxes from the native Mau forest and previously forested lands converted to smallholder grazing land, smallholder and commercial tea plantations and eucalyptus plantations. Fluxes were measured weekly from August 2015 to August 2016 using the static chamber method. Grazing lands had the highest (p = 0.028) cumulative respiratory CO2 fluxes (25.6 ± 2.9 Mg CO2–C ha¯¹ year¯¹), whereas lowest fluxes were observed in commercial tea plantations (5.6 ± 0.5 Mg CO2–C ha¯¹ year¯¹). Soil respiratory CO2 fluxes were positively correlated with soil pH, but negatively correlated with soil C:N ratio. Annual soil fluxes were explained by soil pH, bulk density and the interaction between soil pH and C:N ratio. Most soils were sinks for atmospheric CH4 across all land use types. Methane uptake was highest for native forest sites (- 3.08 ± 0.35 to - 5.84 ± 0.61 kg CH4–C ha¯¹ year¯¹) and for eucalyptus plantations (- 3.43 ± 0.19 kg CH4–C ha¯¹ year¯¹). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000100516
Veröffentlicht am 05.12.2019
Originalveröffentlichung
DOI: 10.1007/s10533-019-00555-8
Scopus
Zitationen: 13
Web of Science
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2019
Sprache Englisch
Identifikator ISSN: 0168-2563, 1573-515X
KITopen-ID: 1000100516
HGF-Programm 12.02.01 (POF III, LK 01) Effects of land use and climate change
Erschienen in Biogeochemistry
Verlag Springer
Band 143
Heft 2
Seiten 171–190
Vorab online veröffentlicht am 28.02.2019
Schlagwörter Deforestation, Kenya, GHG emissions, Fertilisers, Livestock
Nachgewiesen in Scopus
Web of Science
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