Table 2.

StemCO₂ efflux (CO_{2_stem}) values scaled to plot level (Mg C ha⁻¹ yr⁻¹) for the control and the through‐fall exclusion (TFE) plots, calculated according to: surface area scaling; volume scaling assuming 34%, 50% and 80% of the volume is sapwood (SW); scaling assuming CO_{2_stem} scales with volume for tree boles < 10 cm and with area for all woody sections > 10 cm diameter at breast height (dbh)

	Control	TFE	Change (%)
Surface area	7.07 ± 0.72	6.94 ± 0.63	1.8
Volume, 80% SW	5.53 ± 0.56	4.26 ± 0.39	22.9
Volume, 50% SW	3.46 ± 0.35	2.67 ± 0.24	22.8
Volume, 34% SW	2.40 ± 0.24	1.86 ± 0.17	22.5
Volume bole > 10 cm, area < 10 cm	6.81 ± 0.69	6.76 ± 0.61	0.7

Error term shows the ± SE propagated from the error on the measured CO₂ efflux values only. The final column demonstrates the percentage change of the TFE relative to the control. The frequency distribution of trees across size categories for each plot can be seen in Supporting Information Table S2.