Ouma, Turry; Barthel, Matti; Oluoch, Kevin Churchill; Otinga, Abigael; Njoroge, Ruth; Leitner, Sonja; Oduor, Collins; Agredazywczuk, Phillip; Zhu, Yuhao; Tamburini, Federica; Obozinski, Guillaume; Six, Johan; Harris, Eliza: Soil carbon dioxide fluxes measured from automated static closed chambers in maize and potato plots in Uasin Gishu County, Kenya [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995346 (dataset in review), In: Ouma, T et al.: A multi-variable high-resolution dataset of N2O fluxes, isotopologue signatures, greenhouse gas fluxes, soil mineral nitrogen, microclimate, and crop yield from smallholder maize and potato systems [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995337 (dataset in review)
Abstract:
Soil carbon dioxide (CO₂–C) fluxes measured from automated static closed chambers in maize and potato plots in Uasin Gishu County, Kenya. CO₂ fluxes represent total soil respiration (heterotrophic and autotrophic combined) and were recorded simultaneously alongside N₂O and CH₄ using a cavity ring-down spectrometer (Picarro G2308, Picarro Inc., USA) during 45-minute sequential chamber closures at sub-daily resolution. Data span March 2024 to March 2025 at the University of Eldoret, Uasin Gishu County, Kenya (0°34′45″N, 35°18′22″E; 2,213 m a.s.l.) on Ferralsol soils. Four nitrogen fertilisation rates were applied to maize and potato in a randomised complete block design with three replicates: maize at 50 kg N ha⁻¹ , maize at 100 kg N ha⁻¹, potato at 50 kg N ha⁻¹ , and potato at 100 kg N ha⁻¹. Data were collected to characterise soil respiration dynamics across crop types and fertilisation treatments, to provide CO₂ as a co-regulator of the soil carbon balance alongside N₂O and CH₄ fluxes, and to use CO₂ regression linearity as a quality control indicator for all chamber-based flux measurements. Fluxes are reported in mg CO₂–C m⁻² h⁻¹. This dataset is part of a multi-variable collection archived at PANGAEA.
Supplement to:
Ouma, Turry; Barthel, Matti; Oluoch, Kevin Churchill; Otinga, Abigael; Njoroge, Ruth; Leitner, Sonja; Oduor, Collins; Agredazywczuk, Phillip; Zhu, Yuhao; Tamburini, Federica; Obozinski, Guillaume; Six, Johan; Harris, Eliza (submitted): A multi-variable dataset of N₂O fluxes, isotopologue signatures, soil mineral nitrogen, greenhouse gas emissions, and microclimate from smallholder maize and potato systems in Uasin Gishu County, Kenya (March 2024–March 2025). Earth System Science Data
Related to:
Oluoch, Kevin Churchill; Njoroge, Ruth; Otinga, Abigael; Mutua, Scholastica; Ouma, Turry; Agredazywczuk, Phillip; Barthel, Matti; Six, Johan; Collins, Oduro; Leitner, Sonja; Tufail, Muhammad; Oyugi, Antony; Harris, Eliza (preprint): Fate of Nitrogen in Rainfed Maize (Zea mays) Systems of the Tropical Highlands of Kenya Under Increasing Nitrogen Fertiliser Application Rates. https://doi.org/10.2139/ssrn.5912075
References:
Butterbach-Bahl, Klaus; Gasche, R; Breuer, Lutz; Papen, H (1997): Fluxes of NO and N2O from temperate forest soils: impact of forest type, N deposition and of liming on the NO and N2O emissions. Nutrient Cycling in Agroecosystems, 48(1-2), 79-90, https://doi.org/10.1023/A:1009785521107
IUSS Working Group WRB (2007): World Reference Base for Soil Resources 2006, first update 2007. World Soil Resources Reports No. 103. FAO, Rome
Zhu, Yuhao; Butterbach-Bahl, Klaus; Merbold, Lutz; Oduor, Collins; Gakige, Jesse Kagai; Mwangi, Paul; Leitner, Sonja (2024): Greenhouse gas emissions from sheep excreta deposited onto tropical pastures in Kenya. Agriculture, Ecosystems & Environment, 359, 108724, https://doi.org/10.1016/j.agee.2023.108724
Funding:
Swiss National Science Foundation (SNF), grant/award no. 207348: N2O-SSA: Combining measurements, modelling and machine learning to improve N2O accounting for sustainable agricultural development in sub-Saharan Africa
Coverage:
Latitude: 0.579720 * Longitude: 35.306110
Date/Time Start: 2024-03-06T06:25:30 * Date/Time End: 2025-03-13T21:07:00
Minimum Elevation: 2213.0 m * Maximum Elevation: 2213.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Type of study | Study type | Ouma, Turry | |||
| 2 | DATE/TIME | Date/Time | Ouma, Turry | Geocode – UTC | ||
| 3 | Treatment: nitrogen fertilisation | T:N fert | kg/ha | Ouma, Turry | Urea (46% N) applied in 3 split applications | |
| 4 | Treatment: crop type | T:crop | Ouma, Turry | Maize (H 6213) or Potato (Bidii) | ||
| 5 | Species, unique identification | Species UID | Ouma, Turry | Crop type | ||
| 6 | Species, unique identification (Semantic URI) | Species UID (Semantic URI) | Ouma, Turry | Crop type | ||
| 7 | Species, unique identification (URI) | Species UID (URI) | Ouma, Turry | Crop type | ||
| 8 | Block | Block | Ouma, Turry | Randomized complete block design (RCBD) | Four replicate blocks | |
| 9 | Chamber ID | Chamber ID | Ouma, Turry | Automated chamber system and laboratory sample identifiers | ||
| 10 | Carbon dioxide, flux, in mass CO2 carbon per area | CO2-C flux | mg/m2/h | Ouma, Turry | Calculated | Automated static closed chamber; CRDS Picarro G2308. Flux calculated from chamber concentration change over time |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
27643 data points
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