Beurteilende*r| Name: | Univ.Prof. Dr. Thomas Hein |
| Herkunftsbetrieb: | |
| 1.Mitwirkender |
| Name: | Ass.Prof. Priv.-Doz. Mag. Dr. Gabriele Weigelhofer |
| Herkunftsbetrieb: | |
| Arbeit |
| Typ der Arbeit: | Masterarbeit |
| Sprache der Arbeit: | Englisch |
| Titel der Arbeit in Originalsprache: | Effects of agricultural land use on nutrients stoichiometry at River Nzoia headwaters in Kenya |
| Titel der Arbeit in deutsch: | The effects of agricultural land use on the nutrients stoichiometry at the headwaters tributaries of River Nzoia in Kenya |
| Titel der Arbeit in englisch: | Effects of agricultural land use on nutrients stoichiometry at River Nzoia headwaters in Kenya |
| Publikationsmonat: | 04.2020 |
| Seitenanzahl: | 52 |
| Volltext |
| Volltext der Arbeit: | Volltext der Arbeit im PDF-Format laden |
| Online-Katalog der Universitätsbibliothek Bodenkultur |
| AC-Nummer: | AC15696822 |
| Abstract |
| Abstract in Deutsch: | Land use change in the headwater streams influences their water quality as well as their surrounding terrestrial environment. The conversion of forested land into cropland not only alters the organic matter delivery into streams but also affects the levels of soils and stream sediments nutrients. In this study, we evaluated the effects of agricultural land use on the soils, stream sediments and water nutrients levels on the Mount Elgon headwaters of River Nzoia during the high flows. Four up-stream sites with less agricultural influence were compared to six downstream sites with intense agricultural use. From the water N:P analysis, N was the limiting nutrient in the up-stream sites that were characterized by forest, while P was the limiting nutrient in the downstream sites characterized by agricultural land use. SUVA254 analysis showed an increasing Dissolved Organic Carbon aromaticity compared to downstream sites. The average δ13C of the soils in the up-stream sites was lower than those in the downstream, denoting a significant(p<0.05) effect of C4 crops on the soil carbon. The soils C/N was negatively correlated (Pearson, p<0.01) with Ptot and it increased from the upstream to downstream sites due to agriculture. All nutrients increased in the water column from upstream but were all within the Kenyan recommended standards for domestic water source. TSS levels both in upstream and downstream were beyond the set standards. Soils should be well managed to prevent fertility loss from the agricultural headwaters catchments. |
| Abstract in Englisch: | Land use change in the headwater streams influences their water quality as well as their surrounding terrestrial environment. The conversion of forested land into cropland not only alters the organic matter delivery into streams but also affects the levels of soils and stream sediments nutrients. In this study, we evaluated the effects of agricultural land use on the soils, stream sediments and water nutrients levels on the Mount Elgon headwaters of River Nzoia during the high flows. Four up-stream sites with less agricultural influence were compared to six downstream sites with intense agricultural use. From the water N:P analysis, N was the limiting nutrient in the up-stream sites that were characterized by forest, while P was the limiting nutrient in the downstream sites characterized by agricultural land use. SUVA254 analysis showed an increasing Dissolved Organic Carbon aromaticity compared to downstream sites. The average δ13C of the soils in the up-stream sites was lower than those in the downstream, denoting a significant(p<0.05) effect of C4 crops on the soil carbon. The soils C/N was negatively correlated (Pearson, p<0.01) with Ptot and it increased from the upstream to downstream sites due to agriculture. All nutrients increased in the water column from upstream but were all within the Kenyan recommended standards for domestic water source. TSS levels both in upstream and downstream were beyond the set standards. Soils should be well managed to prevent fertility loss from the agricultural headwaters catchments. |
| Schlagworte |
| Schlagwörter Deutsch: | SUVA254 Aromaticity Nutrients Agriculture Headwaters Catchment Fertility |
| Schlagwörter Englisch: | SUVA254 Aromaticity Nutrients Agriculture Headwaters Catchment Fertility |
| Sonstiges |
| Signatur: | D-21665 |
| Organisationseinheit, auf der die Arbeit eingereicht wird: | H81200 Institut für Hydrobiologie und Gewässermanagement (IHG) |
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