Figure 2
From: Pinus sylvestris as a missing source of nitrous oxide and methane in boreal forest
Stem and forest floor fluxes of N2O (a,c) and CH4 (b,d) from dry and wet plots of boreal forest dominated by Scots pine (Pinus sylvestris).
Mean volumetric water contents for dry and wet plots (±s.e.) were 0.33 ± 0.030 m3 m−3 and 0.75 ± 0.016 m3 m−3, respectively. Flux rates of all sampling points as follows are expressed as medians (solid lines) or means (broken lines) per m2 of surface area. Stem fluxes are determined from six trees per plot (n = 6; 3–6 measurement repetitions per tree) and forest floor fluxes from three soil chambers per plot (n = 3; 6–9 repetitions per chamber). The fluxes from the stems and from the forest floor were always measured simultaneously. Statistically significant differences at p < 0.05 are indicated by an asterisk. For box plots description, see Fig. 1.
