Lauren Gwaltney, Kristofor R. Brye, Diego Della Lunga, Trenton L. Roberts, Samuel B. Fernandes, Mike B. Daniels
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引用次数: 0
Abstract
Biochar is a relatively new, potential climate-mitigation strategy, but biochar still requires investigation regarding biochar's ability to reduce greenhouse gas (GHG) emissions. Little research has been conducted to quantify the impacts of biochar on GHG production from upland (i.e., furrow-irrigated) rice (Oryza sativa) production systems. The objective of this study was to evaluate the effects of wood biochar type (powder and coarse particle size) and application rate (0, 2.5, and 5 Mg ha−1) on GHG emissions in greenhouse-grown, simulated furrow-irrigated rice grown in a silt-loam soil. Carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes were measured weekly throughout a 5-month growing season during summer 2023, and season-long emissions and reduced global warming potential (GWP, excluding CO2) were estimated. Among the coarse-sized biochar treatments, season-long N2O emissions (41.7 kg N2O ha−1 season−1) were largest (p < 0.05) from the unamended control (0 Mg ha−1), followed by the 2.5 (17.1 kg N2O ha−1 season−1) and 5 Mg ha−1 rate (4.9 kg N2O ha−1 season−1), while season-long N2O emissions did not differ (p > 0.05) among powder-sized biochar treatments. Reduced GWP was greatest (p < 0.05; 11.2 Mg CO2 eq. ha−1 season−1) from the unamended control, followed by the 2.5 Mg ha−1 rate (4.7 Mg CO2 eq. ha−1 season−1), and least (p < 0.05; 1.4 Mg CO2 eq. ha−1 season−1) from the 5 Mg ha−1 rate of coarse biochar. Results showed that coarse-sized, wood-chip biochar has the potential to mitigate N2O emissions from furrow-irrigated rice in a silt-loam soil.