Table 1.

Summary table of CH₄ fluxes for each measured surface across all four campaigns. Large standard deviations reflect broad topographical gradients spanned within each plot and known species dependency on fluxes e.g. [8]. n = 36 for tree flux measurements at each plot per campaign. Sixty-four aquatic fluxes were made at each location during the first two campaigns only and soil flux measurement n were as follows: campaign 1: n = 5 in the Tapajós and Negro plots; campaign 2: n = 5 in the Negro plot, n = 10 in the Tapajós plot and campaigns 3 and 4: n = 15 at each plot.

		CH4­ flux mg m−2 h−1 (± s.d.)
surface	location	Apr 2017	July 2017	Oct 2017	Jan 2018
tree stem (20–50 cm)		s.d.	s.d.	s.d.	s.d.
	Solimões	61.9 ± 68.2	78.9 ± 52.3	8.19 ± 15.7	0.0128 ± 0.042
	Negro	38.2 ± 53.3	55.8 ± 50.5	5.18 ± 11.8	0.0052 ± 0.015
	Tapajós	69.7 ± 75.8	9.6 ± 20.2	5.94 ± 11.7	−0.0045 ± 0.007
aquatic surface
	Solimões	1.84 ± 1.85	2.33 ± 18.7	dry	dry
	Negro	0.49 ± 0.48	0.77 ± 0.73	dry	dry
	Tapajós	1.68 ± 2.26	1.64 ± 1.47	dry	dry
soil surface
	Solimões	flooded	flooded	−0.022 ± 0.0435	0.0092 ± 0.0158
	Negro	0.027 ± 0.165	0.049 ± 0.9	−0.039 ± 0.0262	−0.0015 ± 0.0123
	Tapajós	−0.013 ± 0.103	−0.008 ± 0.031	−0.043 ± 0.0403	−0.0094 ± 0.0166