Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya
Urine and dung patches deposited by grazing cattle on grassland are an important source of nitrous oxide (N2O). While a number of studies have investigated the effects of excreta on soil N2O fluxes in developed economies and in China, observations in sub-Saharan Africa (SSA) are scarce. Moreover, th...
| Autores principales: | , , , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Elsevier
2020
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/106202 |
| _version_ | 1855528095886344192 |
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| author | Yuhao Zhu Merbold, Lutz Leitner, Sonja Longlong Xia Pelster, David E. Diaz Pines, Eugenio Abwanda, Sheila O. Mutuo, Paul M. Butterbach-Bahl, Klaus |
| author_browse | Abwanda, Sheila O. Butterbach-Bahl, Klaus Diaz Pines, Eugenio Leitner, Sonja Longlong Xia Merbold, Lutz Mutuo, Paul M. Pelster, David E. Yuhao Zhu |
| author_facet | Yuhao Zhu Merbold, Lutz Leitner, Sonja Longlong Xia Pelster, David E. Diaz Pines, Eugenio Abwanda, Sheila O. Mutuo, Paul M. Butterbach-Bahl, Klaus |
| author_sort | Yuhao Zhu |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Urine and dung patches deposited by grazing cattle on grassland are an important source of nitrous oxide (N2O). While a number of studies have investigated the effects of excreta on soil N2O fluxes in developed economies and in China, observations in sub-Saharan Africa (SSA) are scarce. Moreover, the effects of soil properties (e.g. pH or texture) on N2O emissions from excreta patches have hardly been studied. In this study we investigated the importance of soil properties on N2O and carbon dioxide (CO2) emissions from cattle excreta (dung, urine, and manure [dung + urine]) for five typical tropical soils in Kenya. For this, intact soil cores were translocated from Western Kenya (Nandi county) to Nairobi, where N2O and CO2 fluxes were measured over four individual periods (two during dry seasons and two during wet seasons). Fluxes were measured for between 25 and 73 days following surface application of excreta, depending on how quickly emissions returned to baseline. Both dung and manure applications led to increased CO2 and N2O fluxes during both dry and wet seasons. On average, the N2O emission factor (EF) for manure was higher than for dung. The EFs during the wet season were higher for both the dung (0.12%) and urine (0.50%) compared to the dry season EFs (0.01% and 0.07% for dung and urine respectively). Soil type had no measurable effect on N2O and CO2 emissions for either dung or manure application. In contrast, soil clay content was negatively (P < 0.05) and pH positively (P < 0.05) correlated with N2O emissions after urine application. Assuming an excreta-N ratio of dung to urine of 66:34, as evidenced in earlier studies for SSA, and averaging across all treatments and soils, we calculated a cattle excreta N2O EF of 0.14%, which is one magnitude lower than the IPCC default N2O EF of 2%. Our results call for a revision of the IPCC guidelines for calculating N2O emissions from excreta deposition on tropical rangelands. |
| format | Journal Article |
| id | CGSpace106202 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2020 |
| publishDateRange | 2020 |
| publishDateSort | 2020 |
| publisher | Elsevier |
| publisherStr | Elsevier |
| record_format | dspace |
| spelling | CGSpace1062022025-09-29T06:20:46Z Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya Yuhao Zhu Merbold, Lutz Leitner, Sonja Longlong Xia Pelster, David E. Diaz Pines, Eugenio Abwanda, Sheila O. Mutuo, Paul M. Butterbach-Bahl, Klaus soil properties excreta urine animal feeding soil livestock emission farmyard manure Urine and dung patches deposited by grazing cattle on grassland are an important source of nitrous oxide (N2O). While a number of studies have investigated the effects of excreta on soil N2O fluxes in developed economies and in China, observations in sub-Saharan Africa (SSA) are scarce. Moreover, the effects of soil properties (e.g. pH or texture) on N2O emissions from excreta patches have hardly been studied. In this study we investigated the importance of soil properties on N2O and carbon dioxide (CO2) emissions from cattle excreta (dung, urine, and manure [dung + urine]) for five typical tropical soils in Kenya. For this, intact soil cores were translocated from Western Kenya (Nandi county) to Nairobi, where N2O and CO2 fluxes were measured over four individual periods (two during dry seasons and two during wet seasons). Fluxes were measured for between 25 and 73 days following surface application of excreta, depending on how quickly emissions returned to baseline. Both dung and manure applications led to increased CO2 and N2O fluxes during both dry and wet seasons. On average, the N2O emission factor (EF) for manure was higher than for dung. The EFs during the wet season were higher for both the dung (0.12%) and urine (0.50%) compared to the dry season EFs (0.01% and 0.07% for dung and urine respectively). Soil type had no measurable effect on N2O and CO2 emissions for either dung or manure application. In contrast, soil clay content was negatively (P < 0.05) and pH positively (P < 0.05) correlated with N2O emissions after urine application. Assuming an excreta-N ratio of dung to urine of 66:34, as evidenced in earlier studies for SSA, and averaging across all treatments and soils, we calculated a cattle excreta N2O EF of 0.14%, which is one magnitude lower than the IPCC default N2O EF of 2%. Our results call for a revision of the IPCC guidelines for calculating N2O emissions from excreta deposition on tropical rangelands. 2020-01 2019-12-17T14:27:10Z 2019-12-17T14:27:10Z Journal Article https://hdl.handle.net/10568/106202 en Open Access Elsevier Zhu, Y., Merbold, L., Leitner, S., Longlong Xia, Pelster, D.E., Diaz-Pines, E., Abwanda, S., Mutuo, P.M. and Butterbach-Bahl, K. 2020. Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya. Soil Biology and Biochemistry 140: 107636. |
| spellingShingle | soil properties excreta urine animal feeding soil livestock emission farmyard manure Yuhao Zhu Merbold, Lutz Leitner, Sonja Longlong Xia Pelster, David E. Diaz Pines, Eugenio Abwanda, Sheila O. Mutuo, Paul M. Butterbach-Bahl, Klaus Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title | Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title_full | Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title_fullStr | Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title_full_unstemmed | Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title_short | Influence of soil properties on N2O and CO2 emissions from excreta deposited on tropical pastures in Kenya |
| title_sort | influence of soil properties on n2o and co2 emissions from excreta deposited on tropical pastures in kenya |
| topic | soil properties excreta urine animal feeding soil livestock emission farmyard manure |
| url | https://hdl.handle.net/10568/106202 |
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