IMPACT4SOIL OpenAire HAL INRAE Bielefeld Academic Search Engine (BASE) NERC Open Research Archive HAL - Université de Bourgogne (HAL-uB) Crossref Agritrop Microsoft Academic Graph Agriculture, Ecosystems & Environment Open Access 2011-12-29 2016-02-04 Agroforestry represents an opportunity to reduce CO2 concentrations in the atmosphere by increasing carbon (C) stocks in agricultural lands. Agroforestry practices may also promote mineral N fertilization and the use of N2-fixing legumes that favor the emission of non-CO2 greenhouse gases (GHG) (N2O and CH4). The present study evaluates the net GHG balance in two adjacent coffee plantations, both highly fertilized (250 kg N ha-1 year-1): a monoculture (CM) and a culture shaded by the N2-fixing legume tree species Inga densiflora (CIn). C stocks, soil N2O emissions and CH4 uptakes were measured during the first cycle of both plantations. During a 3-year period (6-9 years after the establishment of the systems), soil C in the upper 10 cm remained constant in the CIn plantation (+0.09 ± 0.58 Mg C ha-1 year-1) and decreased slightly but not significantly in the CM plantation (-0.43 ± 0.53 Mg C ha-1 year-1). Aboveground carbon stocks in the coffee monoculture and the agroforestry system amounted to 9.8 ± 0.4 and 25.2 ± 0.6 Mg C ha-1, respectively, at 7 years after establishment. C storage rate in the phytomass was more than twice as large in the CIn compared to the CM system (4.6 ± 0.1 and 2.0 ± 0.1 Mg C ha-1 year-1, respectively). Annual soil N2O emissions were 1.3 times larger in the CIn than in the CM plantation (5.8 ± 0.5 and 4.3 ± 0.3 kg N-N2O ha-1 year-1, respectively). The net GHG balance at the soil scale calculated from the changes in soil C stocks and N2O emissions, expressed in CO2 equivalent, was negative in both coffee plantations indicating that the soil was a net source of GHG. Nevertheless this balance was in favor of the agroforestry system. The net GHG balance at the plantation scale, which includes additionally C storage in the phytomass, was positive and about 4 times larger in the CIn (14.59 ± 2.20 Mg CO2 eq ha-1 year-1) than in the CM plantation (3.83 ± 1.98 Mg CO2 eq ha-1 year-1). Thus converting the coffee monoculture to the coffee agroforestry plantation shaded by the N2-fixing tree species I. densiflora would increase net atmospheric GHG removals by 10.76 ± 2.96 Mg CO2 eq ha-1 year-1 during the first cycle of 8-9 years. P33 - Chimie et physique du sol 570 571 [SDV]Life Sciences [q-bio] F08 - Systèmes et modes de culture http://aims.fao.org/aos/agrovoc/c_1920 stockage Funders: EU CASCA project http://aims.fao.org/aos/agrovoc/c_24345 01 natural sciences 630 agroforestry leguminous tree soil organic matter http://aims.fao.org/aos/agrovoc/c_7427 andosol gaz à effet de serre http://aims.fao.org/aos/agrovoc/c_1721 http://aims.fao.org/aos/agrovoc/c_34841 http://aims.fao.org/aos/agrovoc/c_1666 http://aims.fao.org/aos/agrovoc/c_1301 Inga système de culture http://aims.fao.org/aos/agrovoc/c_35657 0105 earth and related environmental sciences agroforesterie 2. Zero hunger changement climatique Coffea arabica 04 agricultural and veterinary sciences 15. Life on land carbon sequestration http://aims.fao.org/aos/agrovoc/c_331583 http://aims.fao.org/aos/agrovoc/c_207 K10 - Production forestière http://aims.fao.org/aos/agrovoc/c_404 [SDV] Life Sciences [q-bio] séquestration du carbone climate change 13. Climate action global warming potential 0401 agriculture, forestry, and fisheries P01 - Conservation de la nature et ressources foncières carbone http://aims.fao.org/aos/agrovoc/c_1971 central america Andosol matière organique du sol Jean-Michel Harmand, Kristell Hergoualc'h, Kristell Hergoualc'h, Eric Blanchart, Ute Skiba, Catherine Hénault, 2012-02-01 journalpaper Agroforestry represents an opportunity to reduce CO2 concentrations in the atmosphere by increasing carbon (C) stocks in agricultural lands. Agroforestry practices may also promote mineral N fertilization and the use of N2-fixing legumes that favor the emission of non-CO2 greenhouse gases (GHG) (N2O and CH4). The present study evaluates the net GHG balance in two adjacent coffee plantations, both highly fertilized (250 kg N ha-1 year-1): a monoculture (CM) and a culture shaded by the N2-fixing legume tree species Inga densiflora (CIn). C stocks, soil N2O emissions and CH4 uptakes were measured during the first cycle of both plantations. During a 3-year period (6-9 years after the establishment of the systems), soil C in the upper 10 cm remained constant in the CIn plantation (+0.09 ± 0.58 Mg C ha-1 year-1) and decreased slightly but not significantly in the CM plantation (-0.43 ± 0.53 Mg C ha-1 year-1). Aboveground carbon stocks in the coffee monoculture and the agroforestry system amounted to 9.8 ± 0.4 and 25.2 ± 0.6 Mg C ha-1, respectively, at 7 years after establishment. C storage rate in the phytomass was more than twice as large in the CIn compared to the CM system (4.6 ± 0.1 and 2.0 ± 0.1 Mg C ha-1 year-1, respectively). Annual soil N2O emissions were 1.3 times larger in the CIn than in the CM plantation (5.8 ± 0.5 and 4.3 ± 0.3 kg N-N2O ha-1 year-1, respectively). The net GHG balance at the soil scale calculated from the changes in soil C stocks and N2O emissions, expressed in CO2 equivalent, was negative in both coffee plantations indicating that the soil was a net source of GHG. Nevertheless this balance was in favor of the agroforestry system. The net GHG balance at the plantation scale, which includes additionally C storage in the phytomass, was positive and about 4 times larger in the CIn (14.59 ± 2.20 Mg CO2 eq ha-1 year-1) than in the CM plantation (3.83 ± 1.98 Mg CO2 eq ha-1 year-1). Thus converting the coffee monoculture to the coffee agroforestry plantation shaded by the N2-fixing tree species I. densiflora would increase net atmospheric GHG removals by 10.76 ± 2.96 Mg CO2 eq ha-1 year-1 during the first cycle of 8-9 years. Changes In Carbon Stock And Greenhouse Gas Balance In A Coffee (Coffea Arabica) Monoculture Versus An Agroforestry System With Inga Densiflora, In Costa Rica 10.1016/j.agee.2011.11.018 https://doi.org/10.1016/j.agee.2011.11.018