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.
Authors and Publishers
Rufino, Mariana C.
Pelster, David E.
van Asten, Piet J.A.
Verchot, Louis V.
The International Institute of Tropical Agriculture (IITA) is a non-profit institution that generates agricultural innovations to meet Africa’s most pressing challenges of hunger, malnutrition, poverty, and natural resource degradation. Working with various partners across sub-Saharan Africa, we improve livelihoods, enhance food and nutrition security, increase employment, and preserve natural resource integrity.
The Karlsruhe Institute of Technology (KIT) (German: Karlsruher Institut für Technologie) is a public research university and one of the largest research and educational institutions in Germany.
The Center for International Forestry Research (CIFOR) is a non-profit, scientific facility that conducts research on the most pressing challenges of forest and landscapes management around the world. With our global, multidisciplinary approach, we aim to improve human well-being, protect the environment, and increase equity. To do so, we help policymakers, practitioners and communities make decisions based on solid science about how they use and manage their forests and landscapes.
To reduce hunger and poverty, and improve human nutrition in the tropics through research aimed at increasing the eco-efficiency of agriculture.
CIAT’s staff includes about 200 scientists. Supported by a wide array of donors, the Center collaborates with hundreds of partners to conduct high-quality research and translate the results into development impact. A Board of Trustees provides oversight of CIAT’s research and financial management.
Vision, mission and strategy
ILRI's strategy 2013-2022 was approved in December 2012. It emerged from a wide processof consultation and engagement.
ILRI envisions... a world where all people have access to enough food and livelihood options to fulfil their potential.
ILRI’s mission is... to improve food and nutritional security and to reduce poverty in developing countries through research for efficient, safe and sustainable use of livestock—ensuring better lives through livestock.
ILRI’s three strategic objectives are:
CGIAR is the only worldwide partnership addressing agricultural research for development, whose work contributes to the global effort to tackle poverty, hunger and major nutrition imbalances, and environmental degradation.