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UNESCO-IHE Institute for Water Education, Delft (2020)

Effects of livestock on carbon and nitrogen fluxes and storage in watering pans of semi-arid areas : Taita-Taveta County (Kenya)

Waiswa, Michael

Titre : Effects of livestock on carbon and nitrogen fluxes and storage in watering pans of semi-arid areas : Taita-Taveta County (Kenya)

Auteur : Waiswa, Michael

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2020

Résumé partiel
Watering pans are relatively large excavated artificial ponds in which surface runoff collects. They are used in water scarce areas to especially in semi-arid areas for both livestock watering and domestic use. Through surface runoff, the watering pans accumulate elevated amounts of terrestrial carbon, manure and urea from livestock and nutrients from the rangelands whose biogeochemical processing results in greenhouse gas (methane CH4, carbon dioxide CO2 and nitrous oxide N2O) emissions. Therefore, to understand their role as “new” aquatic ecosystems in rangelands for carbon and nitrogen emissions and storage, we analyzed gas and water samples together with sediment cores from 24 watering pans in Taita-Taveta County (Kenya) between November and December 2019. For a fair representation of the herding themes in Taita-Taveta County, the watering pans are classified into six livestock systems ranging from those in large cattle ranches, encroachments on wildlife conservation areas, and small herds within settlement areas along mixed crop farming. We hypothesize that different livestock systems will influence how much nutrients, manure, and or terrestrial organic matter reaches the watering pans. Gas samples for flux and concentration quantification taken using the static gas chamber and headspace equilibrium technique respectively while the water sample analysis was used to relate fluxes and concentrations to biogeochemical controls.

Sujets  : watering pans semi-arid areas greenhouse gas emission aquatic ecosystems livestock

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Page publiée le 21 avril 2021