Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands
This study aims to explain effects of soil textural class, topography, land use, and land use history on soil greenhouse gas (GHG) fluxes in the Lake Victoria region. We measured GHG fluxes from intact soil cores collected in Rakai, Uganda, an area characterized by low‐input smallholder (<2 ha) farming systems, typical for the East African highlands. The soil cores were air dried and rewetted to water holding capacities (WHCs) of 30, 55, and 80%. Soil CO2, CH4, and N2O fluxes were measured for 48 h following rewetting. Cumulative N2O fluxes were highest from soils under perennial crops and the lowest from soils under annual crops (P < 0.001 for all WHC). At WHC of 55% or 80%, the sandy clay loam soils had lower N2O fluxes than the clay soils (P < 0.001 and P = 0.041, respectively). Cumulative soil CO2 fluxes were highest from eucalyptus plantations and lowest from annual crops across multiple WHC (P = 0.014 at 30% WHC and P < 0.001 at both 55 and 80% WHC). Methane fluxes were below detectable limits, a shortcoming for using soil cores from the top soil. This study reveals that land use and soil type have strong effects on GHG fluxes from agricultural land in the study area. Field monitoring of fluxes is needed to confirm whether these findings are consistent with what happens in situ.
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Wiley
2018-03
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Subjects: | land use, climate change, food security, agriculture, soil, greenhouse gases, |
Online Access: | https://hdl.handle.net/10568/97425 https://doi.org/10.1002/2017JG003856 |
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dig-cgspace-10568-974252023-12-08T19:25:22Z Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands Wanyama, Ibrahim Rufino, Mariana C. Pelster, David E. Wanyama, George N. Atzberger, Clement Asten, Piet J.A. van Verchot, Louis V. Butterbach-Bahl, Klaus land use climate change food security agriculture soil greenhouse gases This study aims to explain effects of soil textural class, topography, land use, and land use history on soil greenhouse gas (GHG) fluxes in the Lake Victoria region. We measured GHG fluxes from intact soil cores collected in Rakai, Uganda, an area characterized by low‐input smallholder (<2 ha) farming systems, typical for the East African highlands. The soil cores were air dried and rewetted to water holding capacities (WHCs) of 30, 55, and 80%. Soil CO2, CH4, and N2O fluxes were measured for 48 h following rewetting. Cumulative N2O fluxes were highest from soils under perennial crops and the lowest from soils under annual crops (P < 0.001 for all WHC). At WHC of 55% or 80%, the sandy clay loam soils had lower N2O fluxes than the clay soils (P < 0.001 and P = 0.041, respectively). Cumulative soil CO2 fluxes were highest from eucalyptus plantations and lowest from annual crops across multiple WHC (P = 0.014 at 30% WHC and P < 0.001 at both 55 and 80% WHC). Methane fluxes were below detectable limits, a shortcoming for using soil cores from the top soil. This study reveals that land use and soil type have strong effects on GHG fluxes from agricultural land in the study area. Field monitoring of fluxes is needed to confirm whether these findings are consistent with what happens in situ. 2018-03 2018-09-17T14:25:54Z 2018-09-17T14:25:54Z Journal Article Wanyama I, Rufino MC, Pelster DE, Wanyama G, Atzberger C, van Asten P, Verchot LV, Butterbach-Bahl K. 2018. Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands. Journal of Geophysical Research: Biogeosciences 123(3):976-990. 2169-8961 https://hdl.handle.net/10568/97425 https://doi.org/10.1002/2017JG003856 PII-FP3_CLIFF PII-FP3_SAMPLES en Copyrighted; all rights reserved Limited Access 976-990 Wiley Journal of Geophysical Research: Biogeosciences |
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land use climate change food security agriculture soil greenhouse gases land use climate change food security agriculture soil greenhouse gases Wanyama, Ibrahim Rufino, Mariana C. Pelster, David E. Wanyama, George N. Atzberger, Clement Asten, Piet J.A. van Verchot, Louis V. Butterbach-Bahl, Klaus Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
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This study aims to explain effects of soil textural class, topography, land use, and land use history on soil greenhouse gas (GHG) fluxes in the Lake Victoria region. We measured GHG fluxes from intact soil cores collected in Rakai, Uganda, an area characterized by low‐input smallholder (<2 ha) farming systems, typical for the East African highlands. The soil cores were air dried and rewetted to water holding capacities (WHCs) of 30, 55, and 80%. Soil CO2, CH4, and N2O fluxes were measured for 48 h following rewetting. Cumulative N2O fluxes were highest from soils under perennial crops and the lowest from soils under annual crops (P < 0.001 for all WHC). At WHC of 55% or 80%, the sandy clay loam soils had lower N2O fluxes than the clay soils (P < 0.001 and P = 0.041, respectively). Cumulative soil CO2 fluxes were highest from eucalyptus plantations and lowest from annual crops across multiple WHC (P = 0.014 at 30% WHC and P < 0.001 at both 55 and 80% WHC). Methane fluxes were below detectable limits, a shortcoming for using soil cores from the top soil. This study reveals that land use and soil type have strong effects on GHG fluxes from agricultural land in the study area. Field monitoring of fluxes is needed to confirm whether these findings are consistent with what happens in situ. |
format |
Journal Article |
topic_facet |
land use climate change food security agriculture soil greenhouse gases |
author |
Wanyama, Ibrahim Rufino, Mariana C. Pelster, David E. Wanyama, George N. Atzberger, Clement Asten, Piet J.A. van Verchot, Louis V. Butterbach-Bahl, Klaus |
author_facet |
Wanyama, Ibrahim Rufino, Mariana C. Pelster, David E. Wanyama, George N. Atzberger, Clement Asten, Piet J.A. van Verchot, Louis V. Butterbach-Bahl, Klaus |
author_sort |
Wanyama, Ibrahim |
title |
Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
title_short |
Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
title_full |
Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
title_fullStr |
Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
title_full_unstemmed |
Land Use, Land Use History, and Soil Type Affect Soil Greenhouse Gas Fluxes From Agricultural Landscapes of the East African Highlands |
title_sort |
land use, land use history, and soil type affect soil greenhouse gas fluxes from agricultural landscapes of the east african highlands |
publisher |
Wiley |
publishDate |
2018-03 |
url |
https://hdl.handle.net/10568/97425 https://doi.org/10.1002/2017JG003856 |
work_keys_str_mv |
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