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Smallholder farms in eastern African tropical highlands have low soil greenhouse gas fluxes

Pelster, David; Rufino, Mariana; Rosenstock, Todd; Mango, Joash; Saiz, Gustavo; Diaz-Pines, Eugenio; Baldi, German; Butterbach-Bahl, Klaus

Few field studies examine greenhouse gas (GHG) emissions from African agricultural systems, resulting in high uncertainty for national inventories. This lack of data is particularly noticeable in smallholder farms in sub-Saharan Africa, where low inputs are often correlated with low yields, often resulting in food insecurity as well. We provide the most comprehensive study in Africa to date, examining annual soil CO₂, CH₄ and N₂O emissions from 59 smallholder plots across different vegetation types, field types and land classes in western Kenya. The study area consists of a lowland area (approximately 1200ma.s.l.) rising approximately 600m to a highland plateau. Cumulative annual fluxes ranged from 2.8 to 15.0MgCO₂-C ha¯¹, -6.0 to 2.4 kgCH₄-C ha¯¹ and -0.1 to 1.8 kgN₂O-N ha¯¹. Management intensity of the plots did not result in differences in annual GHG fluxes measured (P =0.46, 0.14 and 0.67 for CO₂, CH₄ and N₂O respectively). The similar emissions were likely related to low fertilizer input rates (≤20 kgNha¯¹/. Grazing plots had the highest CO₂ fluxes (P =0.005), treed plots (plantations) were a larger CH₄ sink than grazing plots (P =0.05), while soil N₂O emissions were similar across vegetation types (P =0.59). ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000066130
Veröffentlicht am 16.11.2018
DOI: 10.5194/bg-14-187-2017
Zitationen: 10
Web of Science
Zitationen: 10
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1726-4189, 1726-4170
KITopen-ID: 1000066130
HGF-Programm 12.02.01 (POF III, LK 01)
Erschienen in Biogeosciences
Band 14
Heft 1
Seiten 187–202
Nachgewiesen in Web of Science
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