Relative importance of soil fertility and microtopography as CO<sub>2</sub> and CH<sub>4</sub> exchange drivers in a northern boreal fen ecosystem.

The fertility zone effect on dwarf shrub dry mass was only marginally significant ( P = 0.076), but the trend was the same, i.e. a higher biomass in the eutrophic (47 ± 20 g m − 2 ) than oligotrophic zone (18 ± 6 g m − 2 ) with an intermediate mass in the mesotrophic zone (27 ± 5 g m − 2 ).

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