Fig. 3: Aquaculture CH4 and N2O budgets in China.
From: Inventory of methane and nitrous oxide emissions from freshwater aquaculture in China
National total emissions of CH4 (a) and N2O (b) from five freshwater aquaculture systems between 1980 and 2022, calculated by multiplying the system mean fluxes by the corresponding provincial aquaculture area. The histogram shows the uncertainty in aquaculture emissions, with the red lines representing the 10, 50 and 90% quantiles of the Monte Carlo simulation. The pie chart shows the percentage of total emissions from each aquaculture system. c Mean CH4 (left axis) and N2O (right axis) emissions for the 1980s (1980–1989), 1990s (1990–1999), 2000s (2000–2009) and 2010s (2010–2022). d Provincial mean emissions (CO2-eq) of CH4 and N2O. Because several provinces are not clear enough to distinguish the emissions from each aquaculture system, we have mapped them (emissions below 2 Tg CO2-eq yr−1) in Supplementary Fig. 2. The full names of all administrative units are listed in Supplementary Table 1. 1 Tg = 103 Gg.
