Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity
Mount Kenya is an equatorial mountain whose climatic setting is fairly simple (two rainy seasons in March–May, the Long Rains, and October–December, the Short Rains) though concealing significant spatial variations related to elevation and aspect (part I, Camberlin et al., 2014). This part II is ded...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Wiley
2016
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/67951 |
| _version_ | 1855541252646240256 |
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| author | Philippon, Nathalie Baron, Christian Boyard-Micheau, Joseph Adde, Antoine Leclerc, Christian Mwongera, Caroline Camberlina, Pierre |
| author_browse | Adde, Antoine Baron, Christian Boyard-Micheau, Joseph Camberlina, Pierre Leclerc, Christian Mwongera, Caroline Philippon, Nathalie |
| author_facet | Philippon, Nathalie Baron, Christian Boyard-Micheau, Joseph Adde, Antoine Leclerc, Christian Mwongera, Caroline Camberlina, Pierre |
| author_sort | Philippon, Nathalie |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Mount Kenya is an equatorial mountain whose climatic setting is fairly simple (two rainy seasons in March–May, the Long Rains, and October–December, the Short Rains) though concealing significant spatial variations related to elevation and aspect (part I, Camberlin et al., 2014). This part II is dedicated to the sensitivity of sorghum yields to climate variability in space and time, with a focus on the intra‐seasonal characteristics of the rainy seasons. To that aim we use the crop model SARRA‐H calibrated for the region and fed with rainfall, temperature, wind speed, humidity and solar radiation data over the period 1973–2001 at three stations located on the eastern slopes of Mount Kenya. The crop model is run independently for the two rainy seasons. Four groups of simulations are conducted by varying the initialization date of the simulation, the sowing dates and the type of soil, in order to test sorghum sensitivity to water availability. Evidence is found that potential sorghum yields are dominantly controlled by variations in seasonal rainfall amounts: mean yields are higher at higher and wetter locations, and are higher during the wettest rainy season and years. However, beyond this apparent simplicity, more complex aspects emerge of the crop–climate relationships. First, the yield–elevation relationship is altered at high elevation due to lower temperature. Second, despite a strong link with the seasonal rainfall amounts, we evidence an underlying role of some intra‐seasonal rainfall characteristics such as the number of rainy days (itself mainly determined by the rainy season duration) or the occurrence of long dry spells. Third, unseasonal rains occurring after the end of the rainy season, especially after the Short Rains, play a role in final crop yield. Fourth, variations of climate variables such as solar radiation by modulating the potential evapotranspiration concur to yield variations at the wettest locations. |
| format | Journal Article |
| id | CGSpace67951 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace679512025-03-13T09:45:40Z Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity Philippon, Nathalie Baron, Christian Boyard-Micheau, Joseph Adde, Antoine Leclerc, Christian Mwongera, Caroline Camberlina, Pierre sorghum crop modelling wet season drought modelización de los cultivos estación húmeda sequía Mount Kenya is an equatorial mountain whose climatic setting is fairly simple (two rainy seasons in March–May, the Long Rains, and October–December, the Short Rains) though concealing significant spatial variations related to elevation and aspect (part I, Camberlin et al., 2014). This part II is dedicated to the sensitivity of sorghum yields to climate variability in space and time, with a focus on the intra‐seasonal characteristics of the rainy seasons. To that aim we use the crop model SARRA‐H calibrated for the region and fed with rainfall, temperature, wind speed, humidity and solar radiation data over the period 1973–2001 at three stations located on the eastern slopes of Mount Kenya. The crop model is run independently for the two rainy seasons. Four groups of simulations are conducted by varying the initialization date of the simulation, the sowing dates and the type of soil, in order to test sorghum sensitivity to water availability. Evidence is found that potential sorghum yields are dominantly controlled by variations in seasonal rainfall amounts: mean yields are higher at higher and wetter locations, and are higher during the wettest rainy season and years. However, beyond this apparent simplicity, more complex aspects emerge of the crop–climate relationships. First, the yield–elevation relationship is altered at high elevation due to lower temperature. Second, despite a strong link with the seasonal rainfall amounts, we evidence an underlying role of some intra‐seasonal rainfall characteristics such as the number of rainy days (itself mainly determined by the rainy season duration) or the occurrence of long dry spells. Third, unseasonal rains occurring after the end of the rainy season, especially after the Short Rains, play a role in final crop yield. Fourth, variations of climate variables such as solar radiation by modulating the potential evapotranspiration concur to yield variations at the wettest locations. 2016-02 2015-08-19T18:19:53Z 2015-08-19T18:19:53Z Journal Article https://hdl.handle.net/10568/67951 en Limited Access Wiley Philippon, Nathalie; Baron, Christian; Boyard-Micheau, Joseph; Adde, Antoine; Leclerc, Christian; Mwongerae, Caroline; Camberlina, Pierre. 2015. Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity . International Journal of Climatology 16 p. |
| spellingShingle | sorghum crop modelling wet season drought modelización de los cultivos estación húmeda sequía Philippon, Nathalie Baron, Christian Boyard-Micheau, Joseph Adde, Antoine Leclerc, Christian Mwongera, Caroline Camberlina, Pierre Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title | Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title_full | Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title_fullStr | Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title_full_unstemmed | Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title_short | Climatic gradients along the windward slopes of Mount Kenya and their implication for crop risks. Part 2: crop sensitivity |
| title_sort | climatic gradients along the windward slopes of mount kenya and their implication for crop risks part 2 crop sensitivity |
| topic | sorghum crop modelling wet season drought modelización de los cultivos estación húmeda sequía |
| url | https://hdl.handle.net/10568/67951 |
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